Question

Give reasons for the following: (i) Why can a woman generally not conceive a child after 50 years of age? (ii) Polar bodies are formed during oogenesis and not during spermatogenesis.

Study the given diagram showing the sectional view of a seminiferous tubule. Answer the following questions: (i) Label A, B, C and D in the figure. (ii) What will be the number of chromosomes in secondary spermatocyte and spermatid respectively? (iii) Explain the terms – Spermiogenesis and Spermiation.