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Standard XII
General Knowledge
Question

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 above statements are correct?
  1. (i),(iv)
  2. (i),(ii)
  3. (ii),(iii)
  4. (iii),(iv)

A
(i),(iv)
B
(iii),(iv)
C
(i),(ii)
D
(ii),(iii)
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Solution
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  • The absence of a consumer, here carnivore, at a trophic level provides a free mating environment to the prey, here deer, leading to an increase in their population.
  • Energy is dissipated at higher or successive trophic levels, therefore, the length of a food chain is generally limited to 3-4 levels.
    So the correct answer is option C.

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Similar Questions
Q1
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 above statements are correct?
View Solution
Q2
Study the following statements regarding food chains and select the correct ones.
(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.
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Q3

Consider the following statements concerning food chains

(A) Removal of 80% tigers from an area resulted in increased growth of vegetation

(B) Removal of most of the carnivores resulted in an increased population of deers

(C) The length of food chains is generally limited to 3-4 trophic levels.

(D) The length of food chains may vary from 2 to 8 trophic levels.

Which two of the above statements are correct?


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Q4

Choose the correct one from the following statements

1. Each organism occupies one trophic level in a food chain.

2. A trophic level in a food chain may be occupied by any of the producers, herbivores, carnivores or decomposers

3. Top consumers in a food chain generally feed on secondary consumers.

4. GFC and DFC are the common food chains and the latter is having maximum energy than the first


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Q5
With reference to food chain in ecosystems, consider the following statements

1. A food chain illustrates the order in which a chain of organisms feed upon each other.
2. From one trophic level to the next, 10 % energy is lost.
3. It depicts the flow of energy in an ecosystem.

Which of the statements given above is / are correct?
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