Disadvantages of chemical agents are

$I.$ chemicals are toxic and harmful to human beings and animals

$II.$ chemicals pollute the environment and plants

$III.$ weedicides used to remove weeds also pollute the soil

Choose the correct option

Which of the following is a commercial blood cholesterol lowering agent?

Superiority of hybrid over parents is

Name some traditional Indian foods made of wheat, rice and Bengal gram (or their products) which involve use of microbes.

Identify the blank spaces $A, B, C$ and $D$ given in the following table and select the correct answer