A) There is a progressive increase in size from zygote to blastula to gastrula
B) All the three will be of the same size
C) Zygote will be smaller, while blastula and gastrula will be larger
D) Gastrula will be larger, while zygote and blastula will be of same size
Correct Answer: D
Solution :
If the size of a fertilized egg of frog is compared with the size of its blastula and gastrula stages, the gastrula will be larger while zygote and blastula will be of same size because during cleavage of zygote blastomeres do not increase in size before the next division begins so, size of the blastomeres gradually decreases with cleavage and number of blastomeres increases but size of zygote and blastula remains same.
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