Write true or false for the statement: If the egg is not fertilized,it lives for about one day.

What happens when the following situations are initiated:
$(a)$ $A$ $Planaria$ is cut into three different pieces.
$(b)$ $A$ leaf of the $Bryophyllum$ with notches falls on the soil.
$(c)$ Testosterone is released in the male reproductive system.

Differentiate between self-pollination and cross-pollination.

Give two differences between a male and a female gamete.

In a tobacco plant,the male gametes have $24$ chromosomes. What is the number of chromosomes in the female gamete? What is the number of chromosomes in the zygote?

Define the following processes:
$(a)$ Fertilization
$(b)$ Menstruation
$(c)$ Binary fission
$(d)$ Vegetative propagation
$(e)$ Regeneration