Which of the following limits the number of trophic levels in a food chain?
(a) insufficient food supply from producer level
(b) decrease in energy at higher trophic levels
(c) increase in the number of organisms at higher trophic levels
(d) accumulation of harmful chemicals at higher trophic levels

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Solution

(b) Decrease in energy at higher trophic levels

According to the 10 per cent law, the amount of energy decreases in each trophic level, and hence the number of trophic levels in a food chain is limited.

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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. The accumulation and progressive increase in the concentration of non-biodegradable, harmful chemicals at different trophic levels in a food chain is called

Assertion : In a food chain members of successive higher levels are fewer in number.

Reason : Number of organisms at any trophic level depends upon the availability of organisms which serve as food at the lower level.

Q. Which among the following is the correct sequence of food chain from a lower trophic level to a higher trophic level?

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(b) Decrease in energy at higher trophic levelsAccording to the 10 per cent law, the amount of energy decreases in each trophic level, and hence the number of trophic levels in a food chain is limited.

(b) Decrease in energy at higher trophic levels

According to the 10 per cent law, the amount of energy decreases in each trophic level, and hence the number of trophic levels in a food chain is limited.