A) The spermatids differentiate into structurally complex spermatozoa by the process of spermiogenesis
B) Fertilization is a physico-chemical event
C) Cleavage transforms the fertilized ovum into a sphere of aggregated blastomeres
D) Cleavage divisions bring appreciable increase in the mass of protoplasm in the developing embryo
Correct Answer: D
Solution :
Cleavage is the process of early mitotic division of zygote, which does not involve growth of daughter cell or blastomere causing increased nucleocytoplasmic ratio. It differs from mitosis in following respects : (i) There is no growth phase between the successive divisions. (ii) Size of cells gradually decreases. (iii) Metabolism becomes fast. (iv) Rapid DNA replication and (v) High consumption of oxygen.
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