Vegetative propagation refers to the formation of new plants from

In the diagram of the human male reproductive system given below:
$(a)$ Label parts $A$ and $B$.
$(b)$ Name the hormone produced by organ $X$. What is the role of this hormone in the human male?
$(c)$ Mention the name of substances that are transported by tubes:
$(i)$ $C$ and $(ii)$ $D$.

Grafting is which type of reproduction method?

Define reproduction. How does it help in providing stability to the population of species?

Define variation in relation to a species. Why is variation beneficial to the species?

What is produced by the fusion of a male gamete and a female gamete?