Question

Which of the following statements about food webs is true? (A.) Most well-studied food webs have two to five trophic levels. (B.) A species trophic level in a food web almost never changes. (C.) Food webs generally provide much information about the strengths of interactions across trophic levels. (D.) Both a and b (E.) Both b and c ???

I know C in not true and the so also E can not be true but was unsure of the answer.

Answer 1

Answer -

Most well-studied food webs have two to five trophic levels. Option - A is correct answer.

A species trophic levels are not constant. Example -

1. mangoes --> fruit fly --> thrush --> eagle.

2. Mangoes --> fruit fly --> dragon fly --> thrush --> eagle.

In the first food chain thrush is secondary consumer.

In the second food chain thrush is tertiary consumer.

Food webs do not provide the information about strength of interactions. They provide energy changes in each level.