Question

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.

How are multiple embryos formed in a citrus fruit ? What is the mechanism known as ?