Name the life process of an organism that helps in the growth of its population.

Differentiate between the following:
$(a)$ Pollen tube and Style
$(b)$ Fission in Amoeba and Plasmodium
$(c)$ Fragmentation and Regeneration
$(d)$ Bud of Hydra and bud of Bryophyllum
$(e)$ Vegetative propagation and Spore formation.

Differentiate between germination and fertilization.

$(a)$ Differentiate between:
$(i)$ Homologous organs and Analogous organs
$(ii)$ Pollination and Fertilisation
$(b)$ What do fossils tell us about the process of evolution?

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.

Reproduction is essentially a phenomenon that is not for the survival of an individual but for the stability of a species. Justify.