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CONTENTS

Friday, September 9, 2011

BEAUTIFUL QUOTE


"When the world brings you down on ur knees...
  Remember that you are in a perfect position to pray.."

Saturday, July 30, 2011

PHERETIMA EXCRETORY AND NERVOUS SYSTEM -PRACTICE BITS

1. (A) : Septal nephridia in Pheretima eliminates nitrogenous wastes from blood as well as coelomic fluid
 (R) : They are enteronephric
 1) Both A & R are true and R explains A
 2) Both A & R are true & R does not explains A
 3) A is true, R is false   4) A is false, R is true
2. (A) : Septal nephridia in Pheretima collect the eleocytes ingested by the amoebocytes to the exterior
 (R) : They are open type
 1) Both A & R are true and R explains A
 2) Both A & R are true & R does not explains A
 3) A is true, R is false   4) A is false, R is true
3. (A) : Seminal vesicles of earthworm are called septal pouches
 (R) : These are formed from septa
 1) Both A & R are true and R explains A
 2) Both A & R are true & R does not explains A
 3) A is true, R is false   4) A is false, R is true
4. (A) : Only one earthworm hatches out from a cocoon
 (R) : In cocoon only one egg is present
 1) Both A & R are true and R explains A
 2) Both A & R are true & R does not explains A
 3) A is true, R is false   4) A is false, R is true
4. (A) : Blood in dorsointestinal blood vessels contains more nutrients in Pheretima
 (R) : In the intestinal region of Pheretima each segment contains two pairs of dorsontestinal blood vessels
 1) Both A & R are true and R explains A
 2) Both A & R are true & R does not explains A
 3) A is true, R is false   4) A is false, R is true
5. (A) : Earthworms are described as ureotelic animals
 (R) : Urea is the major excretory product in earthworms
 1) Both A & R are true and R explains A
 2) Both A & R are true & R does not explains A
 3) A is true, R is false   4) A is false, R is true
6. (A): In Pheretima, coelomic fluid cannot be exchanged between 10th and 11th segments
 (R): 10th and 11th segments in Pheretima are separated by non perforated septum
 1) Both A & R are true and R explains A
 2) Both A & R are true & R does not explains A
 3) A is true, R is false   4) A is false, R is true
7. Following are the statements about nephridia  in Pheretima
 1. Micro nephridia are attached to the inner surface of body wall
 2. The straight lobe of the septal nephridium is continued into the distal limb of the twisted loop
 3. Pharyngeal nephridia are as large as the septal nephridia but like the integumentaries they are exonephric
 Which of the above are correct
 1.All are true 2. Only 1&2 are true
 3. Only 1&3 are true 4. Only 2&3 are true
8. Glands of Pheretima helpful for the formation of spermatophores are
 1. Accessory glands 2. Prostrate glands
 3. Lymph glands 4. Blood glands
9. Ganglia present on the dorsal side of alimentary canal in Pheretima are
 1. Supra oesophageal ganglia
 2. Sub pharyngeal ganglia
 3. Supra pharyngeal ganglia
 4. Segmental ganglia
10. In Pheretima, number of ganglia present in the nerve ring
 1. 4 2.2 3. 12 4. 8
11. Receptors of earthworm sensitive to ground vibrations are
 1. Epidermal receptors
 2. Photo receptors 3. Buccal receptors
 4. Chemo receptors
12. In Pheretima, nerve ring is formed around
 1. Pharynx 2. Oesophagus
 3. Gizzard  4. Buccal chamber
13. Double ventral nerve cord in Pheretima starts from
 1. 3rd segment 2. 4th segment
 3. 5th segment 4. 2nd segment
14. Distinguishing feature of the buccal receptor cells in Pheretima is
 1. Presence of ‘L’ shaped lens
 2. Connected ti nerve fibre
 3. Presence of nuclei in deeper part
 4. Consisting of a hyaline substance
15. Number of nerves arise from cerebral ganglia in Pheretima is
 1. 2 pairs  2. 2
 3. 8 to 10  4. 8 to 10 pairs
16. In Pheretima, double ventral nerve cord is absent in the segments
 1. 4th to last 2. 1st,2nd  and 4th
 3. 1st,2nd and 3rd  4. 3rd and 4th
17. Lens of photoreceptor in Pheretima is
 1. Phaeosome 2. Episome
 3. Mesosome 4. Endosome
18. Double ventral nerve cord in Pheretima arises from
 1. Supra oesophageal ganglia
 2. Sub pharyngeal ganglia
 3. Supra pharyngeal ganglia
 4. Sub oesophageal ganglia
19. Cerebral ganglia in Pheretima are present in the segment
 1. 2nd 2. 3rd 3. 4th 4. 5th
20. Prostomium of Pheretima receives nerves from
 1. Supra oesophageal ganglia
 2. Sub pharyngeal ganglia
 3. Supra pharyngeal ganglia
 4. Sub oesophageal ganglia
21. In Pheretim, segment with nerve ring as well as double ventral nerve cord is
 1. 4th segment 2. 3rd segment
 3. 5th segment 4. 2nd segment
22. In Pheretima epidermal receptors are abundant on
 1. Dorsal and ventral sides
 2. Lateral and dorsal sides
 3. Antero dorsal sides
 4. Ventro lateral sides
23. Afferent fibres of peripheral nerves in Pheretima connects
 1. Receptor to effector organs
 2. Ventral nerve cord to effector organs
 3. Receptor to ventral nerve cord
 4. Ventral nerve cord to receptor
24. Receptors with single cell in Pheretima are
 1. Photoreceptros
 2. Epidermal receptors
 3. Buccal receptors 4. Mechano receptors
25. Number of segmental ganglia in the pre-clitellar region of Pheretima is
 1. 10 pairs 2. 9 pairs
 3. 13 pairs 4. 12 pairs
26. Epidermal receptors in Pheretima acts as
 1. Chemoreceptors 2. Auditory receptors
 3. Gustatory receptors
 4. Olfactory receptors
27. Number of segments in Pheretima with only one type of nephridia is
 1. 8 2. 14 3. 9 4. 15
28. Part of septal nephridium that joins with the septal excretory canal is
 1. Proximal limb of the twisted loop
 2. Short straight lobe
 3. Distal limb of the twisted loop
 4. Terminal nephridial duct
29. V-shaped nephridia in Pheretima  are
 1. Pharyngeal nephridia
 2. Typical nephridia 3. Septal nephridia
 4. Integumentary nephridia
30. Position of supra- intestinal excretory canals in Pheretima is
 1. Above the dorsal blood vessel
 2. Below the intestine 3. Above the intestine 4. Below the ventral blood vessel
31. Pharyngeal nephridia in Pheretima lie on either side of
 1. Buccal chamber and pharynx
 2. Pharynx and oesophagus
 3. Oesophagus and gizzard
 4. Pharynx and gizzard
32. Closed nephridia in Pheretima are
 1. Pharyngeal and integumentary nephridia
 2. Pharyngeal and septal nephridia
 3. Septal and integumentary nephridia
 4. Integumentary and typical nephridia
33. In Pheretima, nephridia absent in segments with blood glands are
 1. Pharyngeal nephridia
 2. Integumentary nephridia
 3. Septal nephridia 4. All
34. Number of septa in Pheretima that do not bear septal nephridia is
 1. 9 2. 10 3. 11 4. 14
35. In Pheretima, nephridia are absent in
 1. First 3 segments 2. Clitellar segments
 3. First 2 segments
 4. Post-clitellar segments
36. Closed and exonephric nephridia are
 1. Pharyngeal nephridia
 2. Typical nephridia
 3. Septal nephridia
 4. Integumentary nephridia
37. In Pheretima, pair of ducts from the pharyngeal nephridia of the sixth segment open into
 1. Pharynx  2. Buccal chamber
 3. Oesophagus 4. Gizzard
38. In Pheretima, nephridia eliminate excretory wastes both from the blood and the coelomic fluid are
 1. Pharyngeal nephridia
 2. Typical nephridia
 3. Septal nephridia
 4. Integumentary nephridia
39. Enteronephric nephridial system of Pheretima is an adaptation for
 1. Conservation of urea
 2. Conservation of water
 3. Elimination of water
 4. Elimination of faeces
40. Enteronephric nephridia in Pheretima are
 1. Pharyngeal and integumentary nephridia
 2. Pharyngeal and septal nephridia
 3. Septal and integumentary nephridia
 4. Integumentary and typical nephridia
41. Based on excretory product Pheretima is described as
 1. Hypotonicand uricotelic
 2. Hypertonic and uricotelic
 3. Hypertonic and uriotelic
 4. Hypotonic and uriotelic
42. Forest of nephridia in Pheretima is
 1. Typhlosolar region 2. Clitellar region
 3. Pre-clitellar region 4. Post-clitellar region
43. Chlorogogen cells are derived from
 1. Outer coelomic epithelium
 2. Epidermis
 3. Inner coelomic epithelium
 4. Endodermis
44. Pharyngeal nephridia in Pheretima opens into
 1. Buccal chamber and pharynx
 2. Pharynx and oesophagus
 3. Oesophagus and gizzard
 4. Pharynx and gizzard
45. Tufted nephridia in Pheretima are
 1. Pharyngeal nephridia
 2. Typical nephridia
 3. Septal nephridia
 4. Integumentary nephridia
46. Terminal nephridial duct of sepal nephridia is the continuation of
 1. Proximal limb of the twisted loop
 2. Nephrostome
 3. Distal limb of the twisted loop
 4.Neck
47. Total number of pharyngeal nephridia in Pheretima is
 1. 3 pairs  2. 200 to 250
 3. 80 to 100 4. Many
48. Septal excretory canals in Pheretima directly opens
 1. Into intestine 2. To out side
 3. Into supra intestinal excretory canal
 4. Into coelom
49. Number of septal excretory canals in each segment is
 1. Many 2. 2 pairs 3. 2 4. 1
50. In Pheretima, the nitrogenous wastes from the blood supplied to the intestinal wall are collectd by
 1. Septal nephridia 2. Chlorogogen cells
 3. Pharyngeal nephridia
 4. Eleocytes
51. In Pheretima, first septum to which septal nephridia are attached lies between the segments
 1. 4/5 2. 14/15 3. 15/16 4. 5/6
52. Number of pre clitellar segments in Pheretima with micro nephridia and without pharyngeal nephridia
 1. 8 2.10 3. 11 4. 13
53. Open and enteronephric nephridia
 1. Pharyngeal nephridia
 2. Typical nephridia 3. Septal nephridia
 4. Integumentary nephridia
54. Detached chlorogogen cells loaded with excretory wastes are called
 1. Phagocytes 2. Mucocytes
 3. Eleocytes 4. Amoebocytes
55. Nephridia absent in Pheretima are
 1. Pharyngeal nephridia
 2. Typical nephridia 3. Septal nephridia
 4. Integumentary nephridia
56. Closed and enteronephric nephridia in Pheretima are
 1. Pharyngeal nephridia
 2. Typical nephridia 3. Septal nephridia
 4. Integumentary nephridia
57. In Phertima phagocytised eleocytes are sent out through
 1. Pharyngeal nephridia
 2. Typical nephridia 3. Septal nephridia
 4. Integumentary nephridia
58. In Pheretima pharyngeal nephridia present on either side of oesophagus but opens into pharynx are present in the segment   
 1. 4 2. 5 3. 6 4. 7
59. In Pheretima pharyngeal nephridia present on either side of oesophagus but opens into pharynx are present in the segment   
 1. 4 2. 5 3. 6 4. 7
60. Number of common nephridial ducts that open into pharynx of Pheretima is
 1. 1 pair 2 .4 pairs 3. 3 pairs 4. 2 pairs
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Tuesday, July 19, 2011

Watch your thoughts; they become words. 
Watch your words; they become actions.   
Watch your actions; they become habits.    
Watch your habits; they become character 

Watch your character;it becomes your destiny.   
                                                                       —Lao-Tze

Friday, July 15, 2011

AVES ASSIGNMENT :

http://pmtguru.weebly.com/zoology-eamcet.html
1. Birds are called glorified reptiles by
  1. Young  2. Huxley  3. Andreas Wagner  4. Hyman
2. Type of vertebrae and skull in birds are respectively
  1. heterocoelous & monocondylic  2. heterocoelous & dicondylic
  3. procoelous & monocondylic  4.procoelous& dicondylic
3. Hind limbs of birds are not useful in
  1. bearing the weight & capturing the food 2. capturing the food & swimming in water
  3. swimming in water & perching on land  4. flying in air & reducing the body weight
4. Structures absent in kiwi are
 1. wings and remiges  2. rectrises and olfactory sense
 3. remiges and olfactory sense  4. rectrises and pecten
5. A: Urinary bladder is absent in birds
 R: Birds are uricotelic.
 1. Both A & R are correct, R is the correct explanation to A
 2. Both A & R are correct, R is not the correct explanation to A
 3. A is true, R is the false  4. R is true, A is the false
6. Incorrect statement about feathers
 1. arrangement is called pterylation    2. these are the only exoskeletal structures in birds
 3. pterylae are irregular in ratitae but regular in carinatae 4. feathery tracts are called pterylae but feather less tracts are called apteria
7. Birds are described as ‘masters of air’ by
 1. Young  2. Huxley  3. Lamarck  4. Linnaeus
8. Arrange the following structures in quill feather on one above the other
 a.barbs  b. barbicels c. rachis  d. barbules
 1. c-a-b-d 2. c-a-d-b 3. c-d-a-b 4. a-c-d-b
9. Vertebrae in birds never participate in the formation of synsacrum are
 1. cervical  2. thorasic  3. lumbar  4. sacral
10. Penguins belong to the super order
 1. Archaeornithes 2 .Neornithes  3. Impennae 4. Ratitae
11. Flightless bird with preen gland but with poorly developed olfactory sense is
 1. Kiwi  2. Tinamus 3. Rhea  4. Struthio
12. Birds are evolved during the period
 1. Triassic  2. Jurassic 3. Cretaceous 4. Carboniferous
13. Incorrect in the following
 1. wooly feathers – down feathers 2. feathers provide excellent insulation – down feathers
 3. tuft of small feathers - after shaft  4. sparcely distributed feathers – quill feathers
14. Structures which help to maintain the shape of the eye in birds are
 1. pecten 2. nictitating membrane    3. sclerotic plates  4. eye lids
15. Match the following and choose the correct combination
     Bird  Distribution
 A. Casuarius 1. Mexican terrestrial
 B. Tinamus 2. Australia, New Guinea
 C. Emu 3. Plains of South America
 D. Rhea 4. Arid regions of Africa and
  Arabia
 E. Struthio 5. Sandy plain or open
  forests of Australia
  1. A-2, B-1, C-5, D-4, E-3  2. A-2, B-1, C-3, D-4, E-5
 3. A-2, B-1, C-5, D-3, E-4  4. A-1, B-2, C-3, D-4, E-5
16. Read the following about birds and choose the correct combination
 I. larynx is at the anterior end and syrinx is at the posterior end of trachea
 II. two pairs of abominal air sacs are present
 III. lungs are spongy with nine air sacs
 1. all are true   2. all except II are true 3. all, except I are true   4. all except III are true
17. Incorrect statement about quill feathers is
 1. Its expanded portion is vane or vexillum 2. Hollow proximal part of the axis is called calamus or quill
 3. Superior umbilicus is between quill and rachis 4. After shaft is near the inferior umbilicus
18. Find the mismatch
 1. jackans penguin – Spheniscus 2. blue jay – Coracious bengalensis
 3. humming bird – Archiochus  4. alpine swift – Eudynamus
19. Find the mismatch
 1. jackans penguin – Spheniscus  2. blue jay – Coracious bengalensis
 3. humming bird – Archiochus  4. alpine swift – Eudynamus
20.    Following are the statements about birds:
A) Female birds are with a pair of functional ovaries. 
B) Cleavage is meroblastic   C)  Eggs are megalecithal 
1) A and B are true  2) B and C are true  3) A and C are true  4) A, B and C are true
21.    Smallest living flightless bird with a keen sense of smell is
1) Dromaeus  2) Casuarius  3) Apteryx  4) Tinamus
22.   Flightless bird with oil gland is
1) Emu  2) Cassowary  3) Tinamou  4) American ostrich
23.  Which of the following character is not seen in birds?
1) Four chambered heart      2) Sinus venosus is absent
3) Truncus arteriosus is absent  4) Developed renal portal system
24.   Feathers known to cover the newly hatched birds and provide insulation are
1) Quill feathers  2) Counter feathers  3) Down feathers  4) Filopumes
 25.  Birds became modernised in the period
1) Carboniferous period  2) Jurassic period  3) Triassic period  4) Cretaceous period

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Friday, July 8, 2011

BASICS AND PHERETIMA - ASSIGNMENT

ASSIGNMENT

1. Wrong statement about the members of a species
  1. Sharing common gene pool and same ecological niche
  2. Showing similarity in the karyotype
  3. Interbreeding freely and producing for the offspring
  4. Having dissimilar structure and functional characteristics
2. Author of “Systema Naturae’ is
   1. Linnaeus 2. Mayr          3. John Ray        4. Dobzhansky
3. The dynamic nature of species became popularized after the publication of
   1. Linnaeus Systema Naturae   2. Darwin’s Origin of species
   3. Lyell’s Principles of Geology  4. Mathus On the principles of population
4. Members of a species show
   1. preferential mating     2. Random mating   3. Non-assrtative mating 4. out crossing
5. “Species” means
   1. Appearance  2 .Arrangement   3.Kind    4. Both 1 and 3
6. Protostomes without body cavity are
   1. Annelids  2. Nematodes 3. Echinoderms 4. Platyhelminths
7. Five-kingdom classification of all living organisms was proposed by
   1.Whittaker  2. Lamarck          3. Bateson  4. Herbert spencer
8. A: Species is dynamic
  R: No new species are formed in course of time
 1) Both A & R are true and R explains A   2) Both A & R are true & R does not explains A
 3) A is true, R is false       4) A is false, R is true
9. Statement (S): Species are group of potentially inter-breeding natural populations that are isolated from other such groups
 Reason (R): Reproductive isolation brings about distinctive morphological characters
   1)Both (S) and (R) are true & (R) is correct explanation to (S)  2) Only (S) is true, (R) is not true
   3) Both (S) and (R) are not true     4) Both (S)&(R) are true & R does not explains (S)
10. (A) : Lateral hearts in 12th and 13th segments of  Pheretima are called latero oesophageal hearts
 (R) : They connect dorsal blood vessel and latero oesophageal blood vessel to ventral blood vessel
   1) Both A & R are true and R explains A     2) Both A & R are true & R does not explains A
   3) A is true, R is false       4) A is false, R is true
11. (A) : Blood in dorsointestinal blood vessels contains more nutrients in Pheretima
  (R) : In the intestinal region of Pheretima each segment contains two pairs of dorsontestinal blood vessels
   1) Both A & R are true and R explains A      2) Both A & R are true & R does not explains A
   3) A is true, R is false       4) A is false, R is true
12. Arrange the following parts in ascending order based on total number
 A. Anterior loops     B. Commissurals    C. Ventro-intestinals    D. Dorso-intestinals     E. Ring vessels
   1. A-E-C-B-D    2. A-E-C-D-B 3. A-E-B-C-D      4. E-A-B-D-C
13. Shortest longitudinal blood vessel in Pheretima is
   1. Supra oesophageal blood vessel  2. Latero oesophageal blood vessel
   3. Ventral blood vessel   4. Dorsal blood vessel
14. In Pheretima, supra oesophageal blood vessel lies on the dorsal side of the
   1. Oesophagus 2. Stomach   3. Intestine 4. Pharynx
15. Paired longitudinal blood vessels in Pheretima are
   1. Supra oesophageal blood vessels 2. Latero oesophageal blood vessels
   3. Ventral blood vessels 4. Dorsal blood vessels
16. In Pheretima, lateral hearts connect
 1.Ventral blood vessel to dorsal blood vessel 2. Ventral blood vessel to supra oesophageal blood vessel
 3. Dorsal blood vessel to ventral blood vessel
 4. Latro oesophageal blood vessel to supra oesophageal blood vessel
17. In Pheretima, blood flow is from posterior to anterior end in
   1. Dorsal blood vessel  2. Ventral blood vessel
   3. Sub neural blood vessel 4. Supra oesophageal blood vessel
18. In Pheretima, number of dorso intestinal blood vessels in each segment is
   1. 1 pair  2. One    3. 2 pairs  4. 3 pairs
19. Blood vessels act as collecting as well as distributing vessels in Pheretima are
   1. Latero oesophageal blood vessels 2. Commissural blood vessels
   3. Supra oesophageal blood vessels  4. Sub neural blood vesels
20. Number of valves in each lateral oesophageal heart of Pheretima is
   1. 3 pairs  2. 4 pairs  3. 8 pairs  4. 2 pairs

Sunday, July 3, 2011

DIGESTIVE SYSTEM OF PHERETIMA - IMP QUESTION FOR IPE

1. Describe the digestive system in Pheretima with the help of  a diagram?
(March 2005, May 2007, March 2010 , MARCH 2011)
Ans
: The digestive system consists of the alimentary canal and the associated digestive
       glands. The  alimentary canal consists of  the following parts.
1) MOUTH* It is a crescentic aperture  present at the anterior end,  ventrally on the first segment  called Peristomium
* The extension of the first segment over hangs like a lip infront of the mouth, called prostomium.
2) BUCCAL CHAMBER
* The  mouth leads into Buccal chamber.
* The Buccal chamber extends from the first to the middle of the third segments
* The walls of the Buccal chamber turn inside out and the Pharynx ( everts ) comes out through the mouth
   and helps in digging the soil.
3) PHARYNX* Buccal chamber leads into Pharynx.
* It occurs in the third and fourth segments.
* Its wall is muscular and contains several blood cells.
* Its Dorsal side is folded and consists of a glandular structure called Pharyngeal bulb, thelateral wall is
  pushed inwards to form a pair of lateral folds called shelves.
* They divide the pharyngeal cavity into 2 compartments, called the dorsal salivary chamber and the ventral
   conducting chamber.
* The chromophilic cells of Pharyngeal bulb secrete proteolytic enzymes and mucus that help in protein   digestion.
* The ventral conducting chamber helps in passing the food.
4) OESOPHAGUS* The Pharynx opens into the oesophagus.
* The oesophagus is a narrow tube extending from the 5th
   to 8th segments.
5) GIZZARD* Oesophagus in 8th segment opens into the gizzzard .
* It is an oval shaped hard muscular chamber .
* It has thick wall of circular muscles and inner lining of chitinous cuticle.
* It grinds the food material into fine particles.
* It is commonly called “ grinding mill “.3
6) STOMACH* The gizzard leads into the stomach.
* The stomach extends from the 9th to the 14th segment.
* It is a highly vascular and glandular tube.
* Its inner foldings contain gland cells, which secrete proteolytic enzymes, that  help in protein dig estion.
7) INTESTINE :* Stomach opens into the long and wide intestine which extends from the 15th
 to the last segment.
* It’s mid dorsal fold is called typhlosole. This is poorly developed in Pheretima.
* It increases the area of absorption of food.
* On the basis of the presence of typhlosole the intestine is divisible into 3 regions.
1) Pre-typhlosolar region 2) Typhlosolar region 3) Post-typhlosolar region
1) Pre-typhlosolar region :* This is the proximal part of the intestine located from 15th to 25th segments.
* In the 26th segment, a pair of conical outgrowths, the intestinal caecae arise form this region laterally
   and extend forward over three or four segments.
* They secrete digestive juices, which contain amylase enzyme.
* Typhlosole  is absent in this part of intestine.
2) Typhlosolar region :* It starts from 26th segment and terminates  in 23 or 25 segments ahead of the hind end of the body.
* It is distinguished by the presence of small mid dorsal projection, the typhlosole, hanging into the
   lumen of the intestine. Typhlosole is poorly developed in Pheretima.
* Digested food is absorbed in this region.
3) Post-typhlosolar region :* It is the distal part of the intestine and it occupies the last 23 or  25 segments.
* It is without a typhlosole.
* It is also called rectum.
* The undigested food is converted into small pellets.
8) ANUS : It is present in the last segment. The undigested food is sent out through the anus in the form of
     pellets. These pellets are called “worm castings”.

Saturday, July 2, 2011

VENOM APPARATUS

REPTILIA

CLASS REPTILIA
Name: From "reptilis" meaning "creeping".
Chief characteristics: Two characteristics of the skull which can be used to distinguish reptiles from amphibians are:
  1. The reptile skull is high and narrow, compared with the low, broad amphibian skull.
  2. In reptiles, the roof of the mouth is arched, with small openings. In amphibians, it is flat with large openings.
Mode of life: Complete colonization of land was achieved by the reptiles, which can lay their eggs on dry land.
Geologic range: Pennsylvanian to Recent.
The oldest reptile fossils, genus Hylonomus, (300 m.y. old) are found in Nova Scotia inside fossilized hollow trees filled with sediment. These reptiles were about 24 cm (about 1 ft) long. They resemble modern insect-eating lizards.
Diadectes sp., from the Early Permian (280-250 m.y.)                   
was a land-dwelling plant eater. The skeletal anatomy is reptilian,    but the skull resembles that of Seymouria, an amphibian.
Dicynodon, a Late Permian (250-230 m.y.), plant-eating reptile. From Cape Province, South Africa.
Photo courtesy of Pamela Gore.
Various groups of vertebrates can be distinguished on the basis of the position and number of openings behind the eye on the side of their skulls.
  1. Anapsida (no holes) - amphibians, the earliest known reptile (Hylonomus), and turtles
  2. Diapsida (two holes) - dinosaurs, flying reptiles, birds, and all groups of living reptiles except turtles
  3. Euryapsida (upper hole only) - extinct marine reptiles
  4. Synapsida (lower hole only) - pelycosaurs, therapsids, and mammals

Diagram showing the evolution of reptiles and synapsids.Diagram showing four vertebrate skull types.



The Synapsids
CLASS SYNAPSIDA
The synapsids had diverged from the reptiles by the Late Carboniferous. The synapsids were long considered to be a subclass of reptile, but more recent cladistic analysis shows that they diverged from ancestors completely different than Hylonomus and other true reptiles.
The synapsids were the dominant terrestrial vertebrate in the Permian.
This group was formerly called the "mammal-like reptiles", however the name has been abandoned because they are not really reptiles.
Synapsids include the pelycosaurs and the therapsids.
Pelycosaurs
Several species of pelycosaurs had fins or "sails" on their backs, supported by rod-like extensions of their vertebrae. These sails may have been used as temperature regulating mechanisms.
Two well known pelycosaurs, which evolved their sails independently were the carnivorous Dimetrodon, and the plant-eating Edaphosaurus. The Permian pelycosaur, Edaphosaurus.
Dimetrodon
has a larger skull and teeth than does Edaphosaurus, suggesting that Dimetrodon was a meat eater. Pelycosaurs lived in the Carboniferous and Permian. The sail-backed forms are characteristic of the Permian.
Therapsids
Therapsids were small to moderate-sized animals with several mammalian skeletal characteristics, such as:
  • Fewer bones in the skull than the other reptiles
  • Mammal-like structure of the jaw
  • Differentiated teeth (incisors, canines, and cheek teeth)
  • Limbs in more direct alignment beneath the body
  • Reduction of ribs in the neck and lumbar regions, allowing greater flexibility
  • Double ball-and-socket joint between the skull and neck
  • Bony palate which permitted breathing while chewing (an important characteristic for animals evolving toward mammalian warm-bloodedness.) Efficient breathing provides oxygen needed to derive heat energy from food
  • Whisker pits on the snout
Mammal-like features are well developed in the therapsid, Cynognathus. (From "kynos" meaning "dog" and "gnathos" meaning "jaw" or "tooth.")
Examination of the bone on the snout portion of the skull reveals probable "whisker pits", suggesting that they had hair, which may have functioned to insulate the animal and slow the rate of heat loss.
Cynognathus crateronotus, a therapsid from the Early Triassic (230-225 m.y.), Cape Province, South Africa.
Note the differentiated teeth. This animal was obviously a predator.


TYPES OF REPTILIAN SKULLS

Wednesday, June 29, 2011

www.pmtguru.weebly.com

FLYING FROG - RHACOPHORUS

TYPHLONECTES GIVING BIRTH

MIDWIFE TOAD


ASCAPHUS


The tailed frogs get their name from the copulatory organ of the male, which resembles a short tail, but is really an expanded portion of the cloaca.  These species are among the very few frogs with internal fertilization; the copulatory organ is used to transfer sperm to the female. They inhabit cold streams in humid forests and the areas around them. The two species of Ascaphus range from British Columbia south to Mendocino County, California, the Rocky Mountains of Idaho and Montana, and adjacent Washington and Oregon. Ascaphus is not known to have an advertisement call, and thus many aspects of their reproductive behavior are poorly known because they cannot be easily observed.  The frogs are semi-aquatic and most active in the vicinity of streams at night.
The tadpole has a large suckerlike mouth that occupies about one-half of the ventral surface of the body. It also has a large number of denticles (2-3 upper and 7-12 lower rows). Tadpoles of most species of frogs have only two upper and three lower rows of denticles. Ascaphus uses its sucker to adhere to and move among rocks in cold, swift streams. The function of the suction mechanism was studied by Gradwell (1971).

Monday, June 27, 2011

CHINESE GIANT SALAMANDER

RANA GOLIATH

PRO , MESO AND METANEPHRIC KIDNEYS

Figure
General scheme of development in the vertebrate kidney. (A) The original tubules, constituting the pronephros, are induced from the nephrogenic mesenchyme by the pronephric duct as it migrates caudally. (B) As the pronephros degenerates, the mesonephric tubules form. (C) The final mammalian kidney, the metanephros, is induced by the ureteric bud, which branches from the nephric duct. (D) The intermediate mesoderm of a 13-day mouse embryo showing the initiation of the metanephric kidney (bottom) while the mesonephros is still apparent. The duct tissue is stained with a fluorescent antibody to a cytokeratin found in the pronephric duct and its derivatives.

Saturday, June 25, 2011

IMPORTANT QUESTIONS FOR - IPE

1. Define biotechnology and write its applications
Ans : It is the branch of biology that deals with the use of biological agents,such as microorganisms and certain cellular components,for beneficial purposes.
Applications of biotechnology :-
a) Pollution control
b) Pharmacology
c) Production of transgenic animals
d) Public heath
2. Distinguish between Eugenics and Euphenics
Ans: EUGENICS:- It is the branch of genetics that deals with the application of knowledge of genetics to human welfare.
EUPHENICS :- It is brach of genetics that deals with the practice of phenotypic improvement of humans after birth.
3. What are retroperitoneal organs ?Ans : The organs of vertebrates  that occur outside the coelom  and are covered by peritoneum  only on the surface facing the coelom are called “retroperitoneal organs”
4. List out the four types of cells present in the epidermis of Pheretima
Ans : The four types of cells in the epidermis of Pheretima are :
1) large glad cells 2) Supporting cells 3) Basal cells 4 ) Receptor cells

Tuesday, June 14, 2011

FLAGELLA AND CILIA


Cilia and Flagella

Cilia and flagella are motile cellular appendages found in most microorganisms and animals, but not in higher plants. In multicellular organisms, cilia function to move a cell or group of cells or to help transport fluid or materials past them. The respiratory tract in humans is lined with cilia that keep inhaled dust, smog, and potentially harmful microorganisms from entering the lungs. Among other tasks, cilia also generate water currents to carry food and oxygen past the gills of clams and transport food through the digestive systems of snails. Flagella are found primarily on gametes, but create the water currents necessary for respiration and circulation in sponges and coelenterates as well. For single-celled eukaryotes, cilia and flagella are essential for the locomotion of individual organisms. Protozoans belonging to the phylum Ciliophora are covered with cilia, while flagella are a characteristic of the protozoan group Mastigophora.

In eukaryotic cells, cilia and flagella contain the motor protein dynein and microtubules, which are composed of linear polymers of globular proteins called tubulin. The core of each of the structures is termed the axoneme and contains two central microtubules that are surrounded by an outer ring of nine doublet microtubules. One full microtubule and one partial microtubule, the latter of which shares a tubule wall with the other microtubule, comprise each doublet microtubule (see Figure 1). Dynein molecules are located around the circumference of the axoneme at regular intervals along its length where they bridge the gaps between adjacent microtubule doublets.

A plasma membrane surrounds the entire axoneme complex, which is attached to the cell at a structure termed the basal body (also known as a kinetosome). Basal bodies maintain the basic outer ring structure of the axoneme, but each of the nine sets of circumferential filaments is composed of three microtubules, rather than a doublet of microtubules. Thus, the basal body is structurally identical to the centrioles that are found in the centrosome located near the nucleus of the cell. In some organisms, such as the unicellular Chlamydomonas, basal bodies are locationally and functionally altered into centrioles and their flagella resorbed before cell division.

Eukaryotic cilia and flagella are generally differentiated based on size and number: cilia are usually shorter and occur together in much greater numbers than flagella, which are often solitary. The structures also exhibit somewhat different types of motion, though in both cases movement is generated by the activation of dynein and the resultant bending of the axoneme. The movement of cilia is often described as whip-like, or compared to the breast stroke in swimming. Adjacent cilia move almost simultaneously (but not quite), so that in groups of cilia, wave-like patterns of motion occur. Flagella, however, exhibit a smooth, independent undulatory type of movement in eukaryotes. Prokaryotic flagella, which have a completely different structure built from the protein flagellin, move in a rotating fashion powered by the basal motor.

Defects in the cilia and flagella of human cells are associated with some notable medical problems. For example, a hereditary condition known as Kartagener's syndrome is caused by problems with the dynein arms that extend between the microtubules present in the axoneme, and is characterized by recurrent respiratory infections related to the inability of cilia in the respiratory tract to clear away bacteria or other materials. The disease also results in male sterility due to the inability of sperm cells to propel themselves via flagella. Damage to respiratory cilia may also be acquired rather than inherited and is most commonly linked to smoking cigarettes. Bronchitis, for instance, is often triggered by a build-up of mucus and tar in the lungs that cannot be properly removed due to smoking-related impairment of cilia.




Wednesday, February 2, 2011

VERY IMPORTANT QUESTIONS WITH ANSWERS

LAQs
1.Describe the human phase of Plasmodium vivax
LIFECYCLE OF PLASMODIUM IN MAN

PLASMODIUM LIFECYCLE IN MAN ;1.Plasmodium completes its life cycle in two hosts
2.female anopheles mosquito is definitive host , man is intermediate host
3.In man asexual lifecycle occurs
4.In man plasmodium completes its lifecycle in two stages. They are
a)Exoerythrocytic stage b) Erythrocytic stage
EXOERYTHROCYTIC STAGE: In this stage two generations are formed. They are preerythrocytic generations and exoerythrocytic generations
PREERYTHROCYTIC GENERATIONS :
1.When mosquito bite humanbeing the sporozoite stage of plasmodium enters into man
2.The sporozoite stage is infective stage of plasmodium to man
3.Sporozoites enters into liver cells from blood stream
4.After entering into the liver cells sporozoites are transformed into trophozoites in livercells
5.The nucleus of the trophozoite undergoes multiplications to become schizont
6.Within 8 days,cytoplasm divides and large number of cryptozoites are released into the liver sinusoids
7.These cryptozoites may either enter into RBC or into another livercells.
EXOERYTHROCYTIC GENERATIONS:
1.When the cryptozoites enter into livercells ,they transform into trophozoites in livercells
2.The nucleus of the trophozoite divides several times and become a multinucleate schizont
3.Then cytoplasm divides and large number of metacryptozoites are released into the sinusoids of liver
4.Two types of metacryptozoits are present ,they are a)Macrometacryptozoites and b)Micrometacryptozoites.
5.Macrometacryptomerozoite enter into fresh liver cells and micrometacryptozoites into RBC
ERYTHROCYTIC STAGE (GOLGI CYCLE) :1.Micrometacryptozoites or cryptozoites enter into RBC and become trophozoites
2.The vacuole of the trophozoite increases in size and pushes the cytoplasm and nucleus to periphery
3.In this stage the parasite appears like a ring hence it is called signet ring stage
4.After signet ring stage plasmodium develops pseudopodia and appears like amoeba , hence this stage is called amoeboid stage
5.Later amoeboid stage develops into schizont
6.Again in this schizont multiplications take place and merozoites are formed
7.Merozoites are released from RBC along with haemozoin granules.
8.Due to this haemozoin granules the symptoms of malaria are seen

2. Describe the mosquito of Plasmodium vivax.

PLASMODIUM-MOSQUITO PHASE
1.After repeated erythrocytic lifecycles in man the merozoite become inactive and transformed into gametocytes.
2.There are two types of gametocytes ,a)Macrogametocytes
b)Microgametocytes
3.Macrogametocytes are called female gametocytes and Microgametocytes are called male gametocytes.
4.The further development of the gametocytes needs female anopheles mosquito.
5.When the female anopheles mosquito bites a malaria patient the male and female gametocytes enter into the crop of mosquito
6.Male gametocytes develop into male gametes and female gametocytes into female gametes.
7.The male and female gametes are fused to form a zygote
8.Intially the zygote is stationary later it becomes motile
9.The motile zygote is called ookinete
10.The ookinete enters into the crop wall of mosquito
11. In the crop wall it gets encysted
12.The encysted zygote is called oocyst
13.In oocyst it enlarges and undergoes multiplications
14.Due to multiplications sporoblasts are formed
15.The cyst containing sporoblasts is called sporocysts
16.Sporoblasts develop into sporozoites
17.Sporozoites released from sporocyst and reach salivary glands
18.When this mosquito with sporozoites in its salivary glands bites a man ,the sporozoites enter into man and life cycle stars in man

3.Describe the life cycle of Taenia sodium.

TAENIA SOLIUM LIFE CYCLE
LIFECYCLE OF TAENIA IN HUMAN :
1.Fertilization takes place in ootype
2.After fertilization zygote is formed
3.Zygote ,vitelline cell and vitelline shell are together called capsule
4.Many capsules roll into uterus
5.Rest of the embryonic development takes place in the uterus
6.Zygote is divided into two unequal cells called megamere and embryonic cell
7.Embryoinc cell divides into mesomeres and micromeres
8.Mesomeres develop into inner embryonic membrane
9.Megameres develop into outer embryonic membrane
10.Micromeres form hexacanth
11.Inner embryonic membrane ,outerembryonic membrane and hexacanth are together called hexacanth larva or oncosphere
12.Gravidproglatids containing oncospheres pass out through faeces
13.Oncosphere is the infective stage to pig
LIFECYCLE OF TAENIA IN PIG;1.When pig consumes the faeces containing gravidproglatids ,oncospheres in gravid proglatids enter into the stomach of pig
2.The outer and inner embryonic membranes are dissolved in the intestine and hexacanth larvae are released
3.Hexacanth larvae are attached to the wall of the intestine
4.Hexacanth larvae penetrate the intestine wall and reach the liver
5.Hexacanth larvae reach the heart from the liver
6.From heart hexacanth reach the skeletal muscles of pig
7.In skeletal muscles hexacanth loses its hooks and develop into cysticercus cellulosae.
8.The pork containing cysticercus cellulosae is called measly pork
9.When man consumes measly pork cysticercus enters into man and develops into an adult
10.The infective stage of taenia to man is cycticercus cellulose

4.Describe the digestive system in Pheretima with the help of diagram

ANS: DIGESTIVE SYSTEM;Alimentary canal and associated digestive glands are collectively called digestive system.

ALIMENTARY CANAL ; It consists of Mouth , buccal cavity, pharynx , oesophagus,gizzard,stomach,intestine .

Mouth :-It is located in the first segment. Due to the presence of the mouth the first segment is called “peristomium”. It leads into buccal cavity.
Buccal cavity :-It extends up to the middle of the yhird segment.It leads into Pharynx.
Pharynx :-It extends between middle of the third segment and end of the fourth segment.it has pharyngeal bulb which secretes proteolytic enzyme.Pharynx leads into oesophagus.
Oesophagus :-It extends between fifth segment to eighth segment.
Gizzard :- Oesophagus is modified into gizzard in eighth segment. It is muscular and grinds the food, hence it is called grinding mill.It leads into stomach.
Stomach :- It extends between ninth and fourteenth segment . It also secretes proteolytic enzymes.It leads into intestine.
Intestine :-It extends between fifteenth segment and last segment. It has three parts :a)Pre-typhlosolar region b) Typhlosolar region c)Post-typhlosolar region.
a)Pre-typhlosolar region:- Typhlosole is absent
b) Typhlosolar region:- Typhlosole is present
c)Post-typhlosolar region;- Typhlosole is absent , it is also called rectum. It opens to the out side through anus.
Anus :- It is present in the last segment.

5.Explain the blood circulation in the first thirteen segments in Phertima with a suitable diagram

ANS:- CIRCULATORY SYSTEM IN FIRST 13 SEGMENTS:-
BLOOD CIRCULATORY SYSTEM IN THE FIRST 13 SEGMENTS OF PHERETIMA
ARRENGEMENT OF BLOOD VESSELS IN THE FIRST 13 SEGMENTS OF PHERETIMA:-
In the first 13 segments of Pheretima the following bloodvessels are present
I)Longitudinal blood vessels II) The hearts
III)The anterior loops IV)Ring vessels
I) Longitudinal blood vessels:
There are 5 longitudinal trunks in Pheretima in its first 13 segments,they are :
1.One Dorsal blood vessel 2.One Ventral blood vessel
3.Two lateral oesophageal blood vessels
4.One supra oesophageal blood vessel
1. Dorsal blood vessel:
a.It is the largest blood vessel
b.It is muscular
c.It is contractile
d.It is valvular
e.Blood flows from posterior to anterior
f.It acts as a distributing blood vessel in the first 13 segments
g.It distributes blood to parts of alimentary canal from buccal cavity to stomach and pharyngeal nephridia
2.Ventral blood vessel:-
a.It is the longest blood vessel
b.It is nonmuscular
c.It is noncontractile
d.It is nonvalvular
e.Blood flows from anterior to posterior
f.It is a chief distributing blood vessel
g.It distributes blood to bodywall,septa,integumentary nephridia,repeoductive organs in the first 13 segments
3. Lateral oesophageal blood vessels:
a.One pair of lateral oesophageal blood vessels present either side of alimentary canal in the first 13 segments
b.These blood vessels collect blood from bodywall,septa,integumentary nephridia,repeoductive organs in the first 13 segments
4. SUPRA OESOPHAGEAL BLOOD VESSEL:-
a.It is located between 9 th segment to 13 th segment
b.It collects blood from gizzard ,stomach and lateral oesophageal blood vessel
c.From supra oesophageal blood vessel blood flows into ventral blood vessel through lateral oesophageal hearts.
II) THE HEARTS :-
a.There are four pairs of hearts in Pheretima
b.The first two pairs are located in the 7 th and the 9 th segments
c.Remaining two pairs are located in the 12 th and the 13 th segments
III)THE ANTERIOR LOOPS :
There are two pairs of anterior loops present in the 10 th and the 11 th segment between supraoesophageal blood vessel and lateral oesophageal blood vessel


IV)RING VESSELS :They are present in the 10th,11th,12th and 13th segments between between supraoesophageal blood vessel and lateral oesophageal blood vessel
6.Give an account of the reproductive organs in Pheretima. Draw a neat labeled diagram of the reproductive system.
Ans: MALE REPRODUCTIVE SYSTEM1. TESTIES:
i. There are 2 pairs of testes.
ii. One pair in 10th and one pair in11th segments.
iii. Each pair is enclosed by testis sac.
iv. They produce spermatogonia.
2. TESTIS SAC:
i. The testis sac is present in 10th and 11th segments.
ii. Testis sac of 10th and 11th segements encloses the testis present in the same segment and also spermiducal funnels.
iii. The testis sac of the 11th segment is large and enclosed the testis spermiducal funnel and seminal vesicals of that segment on each side.
3. SEMINAL VESICLES:
i. Two pairs of seminal vesicles lie laterally in the 11th and 12th segments.
ii. They are also called septal pouches.
iii. In these vesicles spermatogonia develops in to spermatozoa.
4. SPERMIDUCAL FUNNELS:
i. Two pairs of ciliated spermiducal funnels are present in 10th and 11th segments.
5. VASA DEFERENTIA:
i. Each spermiducal funnel leads in to a vasa deferens.
ii. Two vasa deferentia of each side run closely side by side as a slender duct along the inner surface of the body wall from 12th to 18th segments.
6. PROSTATE GLANDS:
i. a pair of large solid white structure irregular in out line.
ii. they lie on each side of the gut from 16 or 17 segment to the 20 or 21 segment.
7. MALE GENITAL OPENINGS
iii. Two genital openings on the ventral side of the 18th segment.
iv. Male genital opening is a group of 3 openings,a large prostatic opening and two small opening of the two vasa deferentia.
8. ACCESORY GLANDS:
i. Two pairs of accessory glands are present in the 17th and 19th segments.
9.GENITAL PAPILLAE :
i. Two pairs of genital papillaeare present in the 17th and 19th segments.

FEMALE REPRODUCTIVE SYSTEMOVARIES:
i. A pair of minute whitish masses attached to the posterior face of the septum between the 12th and 13th segments.
1. OVIDUCTS:
i. oviducts are two short tubes each one with a broad oviducal funnel .
ii. A single female genital aperture is present on the ventral side of the 14th segment.
2. SPERMATHECAE:
i. Spermathecae are four pairs.
ii. present on 6th 7th 8th 9th segments one pair in each segment.
iii. Spermatheca has a pear shaped ampulla and a small diverticulum on its inner side.
iv. The sperms received during copulation are stored in the diverticulum.
v. The ampulla provides the nutritive material for the spermatozoa.
7.Discuss the excretion in Pheretima with the help of diagrams. Ans.The excretory system in Pheretima consist of three kinds of nephridia. They are ;
1) Pharyngeal nephridia 2)Integumentary nephridia 3) Septal nephridia

1) Pharyngeal nephridia:
i.They are located in the 4th ,5th and 6th segments
ii.The are also called tufted nephridia
iii.They do not have nephrostome , hence they are called closed nephridia
iv.They open into alimentary canal , hence they are called enteronephric nephridia

2)Integumentary nephridia
i.They are located in all segments except first two segments
ii.they are also called micronephridia
iii.Each segment consists of 200 to 250 micro nephridia
iv.In clitellum region there are 2000 to 2500 micronephridia present , hence it is called forest
of nephridia
v.They do not have nephrostome , hence they are called closed nephridia
vi.They open to the out side by means of nephridio pore , hence they are called
exonephric nephridia.

3) Septal nephridia
i.They start from the intersegmental septum between 15/16 segments
ii.They are arranged in four rows
iii.Each row consists of 20 to 25 nephridia
iv.There are 80 to 100 septal nephridia present in each segment.
v.Septal nephridia have nephrostome , hence they are called open nephridia
vi.Septal nephridia open into alimentary canal , hence they are called “enteronephric
nephridia.
8.Describe the blood circulation in Pheretima with a schematic representation in the intestine-region
Blood circulation in the intestine region
The blood vessels that are present in the intestine region are :
1. Longitudinal blood vessels
2. Commissural vessels
3. Intestinal blood plexus
4. Dorso intestinal blood vessels.

1. LONGITUDINAL BLOOD VESSELS
i. Dorsal blood vessel:
 Collecting blood vessel
 It is present along the mid dorsal line above the gut.
ii. Ventral blood vessel:
 Chief distributing vessel
 It gives a pair of ventro integumentary blood vessel and a single ventro-intestinal blood vessel in each segment.
iii. Sub neural blood vessel:
 Non muscular
 Non valvular collecting blood vessel
 Blood flows from the anterior to the posterior end
2. COMMISSURAL BLOOD VESSELS:
 A pair of commissural blood vessel is present in each segment from 14th and they connect the sub-neural blood vessel to the dorsal blood vessel.
 These are collecting and distributing vessels.
3. DORSO INTESTINAL BLOOD VESSELS:
 2 pairs of DORSO INTESTINAL BLOOD VESSELS are present
 Vessels collect the blood from the intestinal wall and open in to the doral blood vessel
 Blood in these vessels contain digested food materials
4. INTISTINAL BLOOD PLEXUS:
 It consists of a network of capillaries in the intestine one internal and one external.
 Internal plexus serves to absorb nutrients from the gut.
 External plexus receives blood from the ventro intestinal & the septo intestinal blood vessels and is connected to the internal plexus.
SAQs

1. Describe the process of longitudinal binary fission in Euglena

LONGITUDINAL BINARYFISSION IN EUGLENA
*Binaryfission :- The division of parent individual into two daughter individuals is called binary fission
Longitudinal Binaryfission In Euglena :
*It occurs in favourable conditions
*First karyokinesis takes place
*During karyokinesis nucleus is divided by mitosis
*Cytokinesis follows karyokinesis
*During cytokinesis a longitudinal furrow is formed
*The longitudinal furrow extends to posterior end to divide the euglena into two daughter individuals
*Longitudinal binaryfission in euglena is also called symmetrogenis binaryfission

2. Describe the process of tranverse binary fission in paramecium.

Ans: *Binaryfission :- The division of parent individual into two daughter individuals is called binary fission
Tranverse binary fission in paramecium:
*It occurs in favourable conditions
*First karyokinesis takes place
*During karyokinesis micro nucleus is divided by mitosis and macro nucleus is divided by amitosis
*During cytokinesis a constriction is formed in the middle of the body
*The constriction deepens and divides the animal in to two daughter individuals
*The daughter individual that is formed from anterior region is called proter and that is formed from posterior region is called opisth.
*The transverse binary fission in Paramecium is called “homothetogenic binary fission”

3.Describe the different types of pseudopodia in protozoans.

There are four different types of pseudopodia in protozoans ,they are :-
1)Lobopodia :- They are blunt and finger like pseudopodia
Eg: Amoeba and Entamoeba
2)Filopodia :- They are slender and filamentous like pseudopodia
Eg:Euglypha
3)Reticulopodia :- They are filamentous and branched pseudopodia , they are also called rhizopodia or myxopodia Eg : Elphidium
4)Axopodia :- They are fine needle like pseudopodia radiating from the surface of the body
Eg : Collozoum

4.Describe the different types of flagella in protozoans.

DIFFEREN TYPES OF FLAGELLA IN PROTOZOANS
There are five different types of flagellae in protozoans ,they are :-
1. Stichonematic : One row of lateral appendages are present Eg : Euglena
2. Pantonematic : Two or more rows of lateral appendages are present Eg : Monas
3. Acronematic : Lateral appengages are absent , a terminal filament is present
Eg : Chlamidomonas
4. Pantacronematic : Two or more rows of lateral appendages and terminal filament are present
Eg : Urceolus
5. Anematic : Lateral appendages and terminal filament are absent
Eg : Chilomonas

5.Explain the sol-gel theory of amoeboid locomotion

AMOEBOID LOCOMOTION: SOL-GEL THEORY
*It is also called change of viscosity theory
*It was advocated by Hyman
*It was confirned by Pantin and Mast
*Amoeba attaches to the substratum
*Ectoplasm is formed as hyaline cap at advancing end
*A point of weaknes is formed behind hyaline cap at advancing end
*Plasmasol flows in to advancing end
*Plasma sol is converted in to plasmagel at advancing end by losing water , this zone is called zone of gelation
*Plasmagel gel flows back to uroid end
*Plasma gel is converted into plasma sol by gaining water at uroid end , this zone is called zone of solation
*The rate of gelation and solation is same
*As plasma sol flows towards advancing end the pesupodium extends further
*Amoeba moves on the direction of pseudopodium

6.Describe the physiology of digestion in cockroach
1.Cockroach is omnivorous animal
2. It collects its food by the help of its mouth parts
3.Mandible are useful for chewing
4.The food is mixed with saliva during chewing
5.The chewed food is swallowed
6.The swallowed food reaches the crop
7. Most of the digestion takes place in the crop
8. The partly digested food then passes in to gizzard
9. The partly digested food is ground in the gizzard and filtered in to the mid gut.
10. In the mid gut the rest of the digestion is completed.
Action of enzymes on food in the procccess of digestion in cockroach
a)Amylase digests the starches in to disachharides
b)Sucrase digests the sucrose in to glucose and fructose
c)Maltase digests maltose into glucose
d)Proteases digest proteins into amino acids
e)Lipase digests fats into fatty acids and glycerol

7.Describe the structure of trachea of cockroach.
Trachea :
1.From each spiracle several horizontal trachea run inside
2.They are cephalic , abdominal and commissure tracheal trunks
The structure of the trachea:
1.Thwe wall of the trachea is made of 3 layers .
2.The outer basement membrane, middle epithelium and inner cuticle called intima
3.The intima is produced into spiral thickenings called taenidia.
4.In the taenidiaprotein/chitin layer is differentiated as exocuticle
5.The taenidia keep the trachea always open.

Thursday, January 6, 2011

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Sunday, January 2, 2011

zoology-imp -questions

UNIT-I : PAGE NO ; 19 , RELATION BETWEEN ZOOLOGY AND OTHER BRANCHES

VERY SHORT ANSWER Q.NO ; 1,2 .

BASIC PRINCIPLES OF CLASSIFICATION

VERY SHORT ANSWER Q.NO ; 1,2 , 4,5,7,9,10,16,17,20

UNIT-VI : LONG ANSWER QUESTIONS

DIGESTIVE SYSTEM;
Alimentary canal and associated digestive glands are collectively called digestive system.

ALIMENTARY CANAL ; It consists of Mouth , buccal cavity, pharynx , oesophagus,gizzard,stomach,intestine .

Mouth :-It is located in the first segment. Due to the presence of the mouth the first segment is called “peristomium”. It leads into buccal cavity.
Buccal cavity :-It extends up to the middle of the yhird segment.It leads into Pharynx.
Pharynx :-It extends between middle of the third segment and end of the fourth segment.it has pharyngeal bulb which secretes proteolytic enzyme.Pharynx leads into oesophagus.
Oesophagus :-It extends between fifth segment to eighth segment.
Gizzard :- Oesophagus is modified into gizzard in eighth segment. It is muscular and grinds the food, hence it is called grinding mill.It leads into stomach.
Stomach :- It extends between ninth and fourteenth segment . It also secretes proteolytic enzymes.It leads into intestine.
Intestine :-It extends between fifteenth segment and last segment. It has three parts :a)Pre-typhlosolar region b) Typhlosolar region c)Post-typhlosolar region.
a)Pre-typhlosolar region:- Typhlosole is absent
b) Typhlosolar region:- Typhlosole is present
c)Post-typhlosolar region;- Typhlosole is absent , it is also called rectum. It opens to the out side through anus.
Anus :- It is present in the last segment.

CIRCULATORY SYSTEM IN FIRST 13 SEGMENTS:-
BLOOD CIRCULATORY SYSTEM IN THE FIRST 13 SEGMENTS OF PHERETIMA
ARRENGEMENT OF BLOOD VESSELS IN THE FIRST 13 SEGMENTS OF PHERETIMA:-
In the first 13 segments of Pheretima the following bloodvessels are present
I)Longitudinal blood vessels II) The hearts
III)The anterior loops IV)Ring vessels
I) Longitudinal blood vessels:
There are 5 longitudinal trunks in Pheretima in its first 13 segments,they are :
1.One Dorsal blood vessel 2.One Ventral blood vessel
3.Two lateral oesophageal blood vessels
4.One supra oesophageal blood vessel
1. Dorsal blood vessel:
a.It is the largest blood vessel
b.It is muscular
c.It is contractile
d.It is valvular
e.Blood flows from posterior to anterior
f.It acts as a distributing blood vessel in the first 13 segments
g.It distributes blood to parts of alimentary canal from buccal cavity to stomach and pharyngeal nephridia
2.Ventral blood vessel:-
a.It is the longest blood vessel
b.It is nonmuscular
c.It is noncontractile
d.It is nonvalvular
e.Blood flows from anterior to posterior
f.It is a chief distributing blood vessel
g.It distributes blood to bodywall,septa,integumentary nephridia,repeoductive organs in the first 13 segments
3. Lateral oesophageal blood vessels:
a.One pair of lateral oesophageal blood vessels present either side of alimentary canal in the first 13 segments
b.These blood vessels collect blood from bodywall,septa,integumentary nephridia,repeoductive organs in the first 13 segments
4. SUPRA OESOPHAGEAL BLOOD VESSEL:-
a.It is located between 9 th segment to 13 th segment
b.It collects blood from gizzard ,stomach and lateral oesophageal blood vessel
c.From supra oesophageal blood vessel blood flows into ventral blood vessel through lateral oesophageal hearts.
II) THE HEARTS :-
a.There are four pairs of hearts in Pheretima
b.The first two pairs are located in the 7 th and the 9 th segments
c.Remaining two pairs are located in the 12 th and the 13 th segments
III)THE ANTERIOR LOOPS :
There are two pairs of anterior loops present in the 10 th and the 11 th segment between supraoesophageal blood vessel and lateral oesophageal blood vessel
IV)RING VESSELS :
They are present in the 10th,11th,12th and 13th segments between between supraoesophageal blood vessel and lateral oesophageal blood vessel