Question Bank [2022] — BIOLOGY STD 12 Science — Question

Write the effect of the high concentration of L.H. on a mature graafian follicle.

Give significance: Trophoblast of blastocyst.

Inspiratory Reserve Volume (IRV) and Expiratory Reserve Volume (ERV).

The microscopic pollen grains of the past are obtained as fossils. Mention the characteristic of the pollen grains that makes it happen.

What could have triggered mass extinctions of species in the past?

Would you like to choose an exonuclease enzyme while producing a recombinant DNA molecule?

Mention the similarity between autogamy and geitonogamy.

What is a carcinogen? Name one chemical carcinogen with its target tissue?

A cross between a normal couple resulted in a son who was haemophilic and a normal daughter. In course of time, when the daughter was married to a normal man, to their surprise, the grandson was also haemophilic.
Write the conclusion you draw of the inheritance pattern of this disease.

Why do gametes produced in large numbers in organisms exhibit external fertilisation?