Which crops are affected by diseases caused by nematodes?

$A$ : Goat is called 'poor man's cow'.
$R$ : It yields only a small quantity of milk.

What are the components that cause damage to crops called?

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:

Which fruit is the cheapest but provides the most energy?

Select the correct match for $X$ and $Y$:

Column $X$	Column $Y$
$(1)$ Worker bee	$(A)$ Soluble in ether
$(2)$ Rohu	$(B)$ Sterile female bee
$(3)$ Wax	$(C)$ Father of White Revolution
$(4)$ Kurien	$(D)$ Freshwater fish