The corn will grow faster. Less fertilizer will be needed. Fewer pesticides will be needed. The corn will be more nutritious.
I gave my students this multiple choice question: Some species of bacteria produce a substance that is toxic to insects but harmless to humans. Scientists have isolated the gene that controls production of this substance. Which of the following is the best reason for inserting this gene into corn plants?

Only one answer is correct among these 4 choices:
- The corn will grow faster.
- Less fertilizer will be needed.
- Fewer pesticides will be needed.
- The corn will be more nutritious.

Could you tell me which one is correct?

Fewer pesticides will be needed.