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Question 21

In this model food web the only feeding links are these: mice eat the seeds of grass; owls eat mice. Grass seeds are the only food of the mice in this web. If the grass, and with it all its seeds, is removed and nothing else in this web changes, what happens to the mouse population?

  1. It decreases, because its only stated food source is goneCorrect answer
  2. It increases, because the owls hunt less when the grass is short
  3. It stays the same, because the mice can eat owls in this web
  4. It increases, because the mice become producers once the grass is gone

Explanation

Grass seeds are the only energy source this web gives the mice, so removing the grass removes their food and their numbers fall. The claim about owls hunting less fails because the web states no link between the height of the grass and owl hunting.

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Question 21: In this model food web the only feeding links are these:… · Food Webs and Energy Flow · Questena