- Home
- Standard 12
- Biology
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 $3$ to $4$ trophic levels due to energy loss.
$IV.$ The length of food chains may vary from $2$ to $8$ trophic levels.
Which two of the above statements are correct?
$II \;and \;III$
$III\; and\; IV$
$I \;and \;IV$
$I \;and\; II$
Solution
The series of organisms eating one and being eaten by other is called food chain. 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 energy loss. In grazing food chain, the producers ($i.e.$, plants) are eaten by herbivores ($i.e.$, rabbit, dear, cow, etc) and are eaten by carnivores. Therefore, the removal of most of the carnivores resulted in an increased population of deers.
