A farmer uses pesticides that kill insects. Using a food web, which of the following is the most likely effect on the population of insectivorous birds?

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Question

A farmer uses pesticides that kill insects. Using a food web, which of the following is the most likely effect on the population of insectivorous birds?

Accepted Answer

The bird population will decrease due to reduced food availability — Insectivorous birds rely on insects as their primary food source; if insect populations fall due to pesticide use, the birds will have less food and their population will decline. This demonstrates how changes at one trophic level can cascade through a food web.

Answer

The bird population will remain unchanged because birds can photosynthesise

Answer

The bird population will decrease due to reduced food availability

Answer

The bird population will increase because pesticides are toxic only to mammals

Answer

The bird population will increase because there are fewer insects competing with them

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