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Standard X
Chemistry
Characteristics of Ecosystem
Food chains a...
Question
Food chains are long and involved, with at least seven or eight trophic levels
A
True
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B
False
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Solution
The correct option is
B
False
The feeding positions in a food chain or web are called trophic levels.
All food chains and webs have at least two or three trophic levels.
There are a maximum of four trophic levels.
Many consumers feed at more than one trophic level.
Generally, there are no more than four trophic levels because energy and biomass decrease from lower to higher levels.
So the given statement is false.
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Short / Long Answer Type Questions :
With reference to food chains, what is a trophic level ? What is an ecological pyramid?
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Food web and food chain are made up of different trophic levels.
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Short / Long Answer Type Questions :
Describe the food chain Operating in a pond. State the food habit of each trophic level in this food chain
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Based on the given assertion and reason, choose the right option.
Assertion [A]: Decomposers are excluded from the food chains.
Reason [R]: Decomposers act at all trophic levels of food chains.
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Energy flow through different trophic levels in any food chain or food web is unidirectional.
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