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Question

Choose the correct set of answers from the following: 
I.   Frogs are bioindicators
II.  Frogs are biological control agents
III. Frogs play an important role in the food web
  1. I and II
  2. I, II and III
  3. I and III
  4. II and III


Solution

The correct option is B I, II and III
Frogs are sensitive to environmental changes such as pollution. One reason for this could be the permeable skin that can absorb toxins and pollutants. This can cause malformations in frogs. Hence frogs act as bioindicators. A decline in amphibian population can be an indicator of pollution. Frogs act as biological control agents by protecting the crops. It feeds on harmful insects. They have an important role in the food chains and food webs. Hence they help in maintaining the balance of the ecosystem. 

 

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