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Question 23

In this model food web the only feeding links are these: rabbits eat grass; grasshoppers eat grass; frogs eat grasshoppers. Grasshoppers are the only food of the frogs in this web. If all the grasshoppers are removed and nothing else in this web changes, what happens to the frog population?

  1. It increases, because the frogs no longer compete with the grasshoppers
  2. It decreases, because its only stated food source is goneCorrect answer
  3. It stays the same, because the frogs can eat grass instead
  4. It stays the same, because the rabbits also eat grass

Explanation

Grasshoppers are the only food this web gives the frogs, so removing them takes away the frogs' whole energy supply and the frog population falls. The idea that the frogs eat grass instead fails because the web contains no feeding link from grass to frogs.

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Question 23: In this model food web the only feeding links are these:… · Food Webs and Energy Flow · Questena