Which method of asexual reproduction occurs in $Spirogyra$?

List any two reasons why the Government has banned prenatal sex determination by law.

'Malarial parasite' divides into many daughter individuals simultaneously through multiple fission. State an advantage that the parasite gets because of this type of reproduction.

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.

What are sexually transmitted diseases? Name an $STD$ which damages the immune system of the human body.

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