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Question
Statement 1: In a food chain, number of organisms at each successive level decreases.
Statement 2: Number of organisms at any trophic level depends upon the availability of food and energy.
Statement 1: In a food chain, number of organisms at each successive level decreases.
Statement 2: Number of organisms at any trophic level depends upon the availability of food and energy.
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Solution
The correct option is B Both the assertion and the reason are true but the reason is not the correct explanation of the assertion
The number of organisms at any trophic level depends upon the amount of food and energy at the previous level. Therefore, most food chains will have a higher number of organisms at the producer level and the number decreases at each successive level.
But there are exceptions to this. For example, in a tree ecosystem, although the number of organisms at the first trophic level- the tree is just one, the number of organisms at the successive levels increases (the animals living on the tree). Therefore statement 1 is not always true.
The number of organisms at any trophic level depends upon the amount of food and energy at the previous level. Therefore, most food chains will have a higher number of organisms at the producer level and the number decreases at each successive level.
But there are exceptions to this. For example, in a tree ecosystem, although the number of organisms at the first trophic level- the tree is just one, the number of organisms at the successive levels increases (the animals living on the tree). Therefore statement 1 is not always true.
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