ECOLOGY
ECOSYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The amount of food produced by producer is limited.
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Consumer’s demand is high.
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90% of the food is lost as heat at each transfer between trophic levels.
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Activity of decomposer is poor.
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Detailed explanation-1: -On average only 10 percent of the food available to a trophic level is transferred to next tropic level. Since the amount of available energy becomes as we move to higher tropic levels so very little usable energy remains after four trophic levels. That’s why the food chain has only 3 to 4 tropic levels.
Detailed explanation-2: -At each step up the food chain, only 10 percent of the energy is passed on to the next level, while approximately 90 percent of the energy is lost as heat.
Detailed explanation-3: -The energy pyramid (Figure below) shows four levels of a food chain, from producers to carnivores. Because of the high rate of energy loss in food chains, there are usually only 4 or 5 trophic levels in the food chain or energy pyramid. There just is not enough energy to support any additional trophic levels.
Detailed explanation-4: -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. Hence, with increasing trophic levels the amount of energy decreases.
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.