List two desirable traits for fodder crops.

State the differences between "Mixed Farming" and "Mixed Cropping".

Mention two factors which affect food grains during storage.

"Excessive use of chemicals such as insecticides and pesticides causes a threat to ecology." Explain with reason.

$(i)$ Name the three varieties of pesticides used.
$(ii)$ Write the problems related to the excess use of pesticides.

The figure shows two crop fields [Plots $A$ and $B$] that have been treated with manures and chemical fertilizers,respectively,while keeping other environmental factors constant. Observe the graph and answer the following questions.
$(i)$ Why does plot $B$ show a sudden increase and then a gradual decrease in yield?
$(ii)$ Why is the highest peak in the plot $A$ graph slightly delayed?
$(iii)$ What is the reason for the different patterns of the two graphs?