Single Choice

Consider the following statements concerning food chains. Which two of these statements are correct? (a) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation. (b) Removal of most of the carnivores resulted in an increased population of deer. (c) The length of food chains is generally limited 3-4 trophic levels due to energy loss. (d) The length of food chains may very from 2 to 8 trophic levels.

AOnly a and d
BOnly a and c
COnly b and c
Correct Answer
DOnly c and d

Solution

1st statement is incorrect as removal of tigers from an area will result in decreased growth of vegetation, as this will increase in the population of deers, which consumers more plants and thereby decreased vegetation.
2nd statement is correct as removal of most of the carnivores will result in increased population of deers as there are no animals to kill them.
3rd statement is correct as length of food chains is generally limited to 3-4 trophic levels in order to reduce energy loss as energy is loss at each trophic level and therefore sufficient energy would not be reach if chain has more then 4 trophic levels.
4th statement is incorrect as length of food chains does not varies from 2-8 trophic levels, it generally reaches upto 3-4 trophic levels in order to minimize the loss of energy.
Therefore, the correct answer is option C.

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