Statement $P$: Single-cell protein is obtained through the process of fermentation.
Statement $Q$: Callus is maintained on agar-agar gel.

Identify the incorrect statements from the following:
$(i)$ Increasing milk production capacity is an objective of animal breeding.
$(ii)$ Breeds of each domesticated animal show variations in their characteristics.
$(iii)$ Out-crossing involves breeding between a male and a female of two different species.
$(iv)$ $A$ mule is an example of interspecific hybridization.

Which of the following is produced in the highest quantity in India?

Which organization indicates that eggs have high biological value?

Assertion : Cattle breeds can be improved by superovulation and embryo transplantation.
Reason : Superovulation in high milk-yielding cows is induced by hormonal injection.

When two unrelated individuals or lines are crossed,the performance of $F_1$ hybrid is often superior to both its parents. This phenomenon is called