Question 13
Which of the following limits the number of trophic levels in a food chain?

(a) Decrease in energy at higher trophic levels
(b) Sufficient food supply
(c) Polluted air
(d) Water

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Solution

Option (a) is correct.
Energy decreases as it moves up the trophic levels because energy is lost as metabolic heat when the organisms from one trophic level are consumed by organisms from the next level.

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Question 13
Which of the following limits the number of trophic levels in a food chain?

(a) Decrease in energy at higher trophic levels
(b) Sufficient food supply
(c) Polluted air
(d) Water

Assertion [A]: The number of trophic levels in the grazing food chain is restricted.

Reason [R]: Energy decreases from lower trophic level to the higher trophic level

Q. Which of the following limits the number of trophic levels in a food chain?

There is a loss of energy as we go from one trophic level to the next; this limits the number of trophic levels in a food-chain.

Question 9
Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the

(a) food web
(b) ecological pyramid
(c) ecosystem
(d) food chain

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Food Chains and Trophic Levels

Standard VIII Biology

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Question 13 Which of the following limits the number of trophic levels in a food chain? (a) Decrease in energy at higher trophic levels (b) Sufficient food supply (c) Polluted air (d) Water

Option (a) is correct. Energy decreases as it moves up the trophic levels because energy is lost as metabolic heat when the organisms from one trophic level are consumed by organisms from the next level.

Question 13
Which of the following limits the number of trophic levels in a food chain?

(a) Decrease in energy at higher trophic levels
(b) Sufficient food supply
(c) Polluted air
(d) Water

Option (a) is correct.
Energy decreases as it moves up the trophic levels because energy is lost as metabolic heat when the organisms from one trophic level are consumed by organisms from the next level.