Which one of the following statements with regard to embryonic development in humans is correct?
(a) Cleavage divisions bring about considerable increase in the mass of protoplasm.
(b) In the second cleavage division, one of the two blastomeres usually divides a little sooner than the second.
(c) With more cleavage divisions, the resultant blastomeres become larger and larger.
(d) Cleavage division results in a hollow ball of cells called morula.
(a) Cleavage divisions bring about considerable increase in the mass of protoplasm.
Explanation:
Repeated cleavage in the zygote brings about the distribution of the cytoplasm of the zygote among blastomere and increases mobility of the protoplasm which facilitates morphogenetic movements for cell differentiation.