What is the primary source of food and fodder?

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:

The honey bees exhibit a type of dance to communicate the location of food. This is known as:

$A$ system of rotating crops with legume or grass pasture to improve soil structure and fertility is called

The toxicants which kill the pests on coming in direct contact are known as

Vitamin $B_{12}$ is most abundantly found in: