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Consider the following statements concerning food chains.

 I. Removal of 80% tigers from an area resulted in greatly increased growth of vegetation

 II. Removal of most of the carnivores resulted in an increased population of deers

 III. The length of food chains is generally limited to 3-4 trophic levels due to energy loss

 IV. The length of food chains may vary from 2 to 8 trophic levels

Which of the two above statements are correct?

 (a) I and II

(b) ll and lll

(c) III and IV

(d) I and IV

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Correct option (a) I and II

Explanation:

Statements II and lII are correct. A simple food chain consists of producers, herbivores and carnivores. The length of food chain is generally limited to 3-4 trophic levels due to the energy loss. In grazing food chain the producers (i.e. plants) are eaten by herbivores (i.e. rabbit, deer, cow, etc) and the herbivores are eaten by carnivores. Therefore, the removal of most of the carnivores resulted in an increased population of deers.

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