Which crops are affected by diseases caused by nematodes?

Which of the following is a pheromone?

What is the correct evolutionary sequence of the progress in the use of plants for food?

Shahtoosh is obtained from:

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:

What is the practice of alternating leguminous crops with forage crops to improve soil structure and fertility called?