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31. |
Gastrula is the stage of the embryonic development of frog in which: |
A. |
The embryo has three primary germ layers |
B. |
Embryo is a hollow ball of cells with a single cell thick wall |
C. |
Embryo has ectoderm, endoderm and a blastopore |
D. |
Embryo has ectoderm, endoderm and a rudimentary nervous system |
Answer: Option A
Explanation:
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32. |
Three processes involved in the gastrulation of frog are in which of the following sequences: |
A. |
Epiboly, invagination, cleavage |
B. |
Involution, invagination, cleavage |
C. |
Involution, epiboly, evagination |
D. |
Involution, epiboly, invagination |
Answer: Option D
Explanation:
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33. |
Beginning of the formation of archenteron in the development of frog represents: |
A. |
Early blatula stage |
B. |
Neurula stage |
C. |
Early gastrula stage |
D. |
Late gastrula stage |
Answer: Option C
Explanation:
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34. |
Late gastrula in frog shows: |
A. |
Ectoderm, endoderm, blastopore and archenteron |
B. |
Ectoderm, mesoderm, blastopore and archenteron |
C. |
Ectoderm, endoderm, blastocoel and archenteron |
D. |
Ectoderm, mesoderm, blastocoel and archenteron |
Answer: Option A
Explanation:
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35. |
Blastopore is found in: |
A. |
Blastula and is the opening of blastocoel |
B. |
Blastula and is opening of archenteron |
C. |
Gastrula and is the opening of blastocoel |
D. |
Gastrula and is the opening archenteron |
Answer: Option D
Explanation:
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36. |
Holoblstic and equal cleavages in frog end after: |
A. |
First cleavage division |
B. |
Second cleavage division |
C. |
Fourth cleavage division |
D. |
Fifth cleavage division |
Answer: Option B
Explanation:
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37. |
Cleavage differs from mitosis in that: |
A. |
It occurs in all body cells |
B. |
It occurs only in zygote |
C. |
It results into haploid cells only |
D. |
It results into unidentical cells |
Answer: Option B
Explanation:
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38. |
Which grouping correctly represents the germinal layer and the structure derived from it: |
A. |
Ectoderm - liver |
B. |
Mesoderm - skeleton |
C. |
Endodern - brain |
D. |
Ectoderm - blood vessels |
Answer: Option B
Explanation:
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39. |
Which of the following structures are formed by the ectoderm in frog: |
A. |
Epidermis, stomodaeum and proctodaeum |
B. |
Retina, lens, cornea and conjunctiva of the eye |
C. |
Olfactory lobes, autitory vesicle, pituitary, pineal body and adrenal medulla |
D. |
All of these |
Answer: Option D
Explanation:
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40. |
All the digestive glands are formed in the vertebrates by: |
A. |
Ectoderm only |
B. |
Endoderm only |
C. |
Mesoderm only |
D. |
None of these |
Answer: Option B
Explanation:
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