Assertion $(A)$ : Vernalization is acceleration of subsequent flowering by low temperature treatment.

Reason $(R)$ : Site of vernalization is apical meristem.

Parasexual hybridization means

Assertion : Cattle breeds can be improved by superovulaton and embryo transplantaion.

Reason : Superovulation in high milk-yielding cows is induced by hormonal injection.

In an experiment freshly hatched larvae of an insect (Khapra beetle) were reared on a basal diet (complete diet without cholesterol) with increasing amounts of cholesterol. Results obtained are shown in the given graph.

The graph indicates

Pearl is secreted around the