Question

Which is correct about human embryonic development a)cleavage divisions brings about considerable increase in mass of protoplasm

b)in the second division, one of the two blastomeres usually divides a little sooner than the second

c)with more cleavage division, the resultant blastomeres becomes larger and larger

d)cleavage division result in hollow ball of cells called morula

Answer 1

In the second cleavage division, one of the two blastomeres usually divides a little sooner than the second to form two types of cell inner and outer. The outer cell aligns to form trophoblast while the inner mass of cell forms the developing embryo. The cavity formed is known as a blastocoel and the developed embryo is known as blastocyst.
So, the correct answer is option B.