The initial free end of the fallopian tube towards the ovary is funnel-shaped. What is it called?

Explain what happens when:
$(a)$ Testosterone is released in males.
$(b)$ Pollen grain falls on the stigma of the flower.
$(c)$ Egg fuses with sperm cell.
$(d)$ Planaria is cut into many pieces.
$(e)$ Buds are formed on the notches of the Bryophyllum leaf.

What are the functions of the testes in a young male?

The spherical bacteria of the species $Neisseria$ $gonorrhoeae$ are responsible for which sexually transmitted disease in humans?

Which of the following statements are true for flowers?
$(i)$ Flowers are always bisexual
$(ii)$ They are the sexual reproductive organs
$(iii)$ They are produced in all groups of plants
$(iv)$ After fertilisation they give rise to fruits

Vegetative propagation refers to the formation of new plants from: