SCIENCE
ECOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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There are not enough organisms to fill more than five levels
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There is too much competition among organisms at the lower levels to support more animals at higher levels
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The statement is not true; there can be unlimited tropic levels
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Energy is lost at each trophic level
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Detailed explanation-1: -The different feeding positions in a food chain or web are called trophic levels. Generally, there are no more than four trophic levels because energy and biomass decrease from lower to higher levels.
Detailed explanation-2: -The correct answer is d. Most of the food chains are limited to four or five trophic levels. This is because at each trophic level some amount of energy is lost as heat. All the energy is not transferred to the next trophic level.
Detailed explanation-3: -It is rare to find food chains that have more than four or five links because the loss of energy limits the length of food chains. At each trophic level, most of the energy is lost through biological processes such as respiration or finding food.
Detailed explanation-4: -There are rarely more than five links (or five organisms) in a food chain because, according to the 10 per cent law, only 10 per cent of the available energy is transferred to the next trophic level.
Detailed explanation-5: -Food chains usually do not go beyond the fourth or fifth trophic level because energy transformations across trophic levels are never 100% efficient. Only 10% of the energy from one trophic level can pass onto the next trophic level.