Which method of propagation allows for the combination of desirable traits in plants?

Mention any four ways of asexual reproduction.

In $Spirogyra$,asexual reproduction takes place by:

What is the process of release of an ovum from the ovary called?

What changes are observed in the uterus if fertilisation does not occur?

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.