Which is the only fertile female in a honey bee colony?

The liquid wax is obtained from:

In view of the current food crisis,it is said that we need another green revolution. Highlight the major limitations of the earlier green revolution.

Which of the following is considered the most primary and essential need among the basic requirements of humans?

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:

Match the following columns:

Column-$I$	Column-$II$
$P$. Philippines	$I$. Developed the first semi-dwarf wheat variety
$Q$. Taiwan	$II$. $IR-8$
$R$. India	$III$. Sonalika and Kalyan Sona
$S$. Mexico	$IV$. Taichung Native-$I$