Secondary pollutants are more harmful than primary pollutants.

The statement is true.

Explanation:

Secondary pollutants are formed from a recation of primary pollutants with the compounds present in the atmosphere. This includes ozone, smog, sulfur trioxide, acid rain, hydrogen peroxide, acetylnitrites. These compounds are modified products and are more damaging.

B. False

Explanation:

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affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.