With reference to food chains in ecosystems, consider the following statements: 1. A food chain illustrates the order in which a chain of organism feed upon each other. 2. Food chains are found within the populations of a species. 3. A food chain illustra

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Q: 6 (IAS/2013)
With reference to food chains in ecosystems, consider the following statements:
1. A food chain illustrates the order in which a chain of organism feed upon each other.
2. Food chains are found within the populations of a species.
3. A food chain illustrates the numbers of each organism which are eaten by others.
Which of the statement given above is / are correct?

question_subject: 

Ecology

question_exam: 

IAS

stats: 

0,375,230,375,88,121,21

keywords: 

{'food chains': [0, 0, 0, 1], 'food chain': [4, 0, 1, 4], 'ecosystems': [0, 0, 1, 2], 'organism feed': [0, 0, 0, 1], 'chain': [0, 0, 0, 3], 'species': [0, 0, 0, 2], 'populations': [0, 0, 2, 1], 'organism': [1, 0, 0, 0], 'order': [6, 12, 34, 35], 'numbers': [0, 1, 0, 0]}

The correct answer is:

1 only.

Statement 1 is correct. A food chain illustrates the order in which a chain of organisms feed upon each other. It shows the transfer of energy and nutrients from one organism to another in a linear sequence.

Statement 2 is incorrect. Food chains are not limited to within the populations of a single species. They typically involve multiple species and depict the flow of energy and nutrients through different trophic levels, including producers (plants), primary consumers (herbivores), secondary consumers (carnivores), and so on.

Statement 3 is incorrect. A food chain does not specifically illustrate the numbers of each organism eaten by others. It focuses on the flow of energy and the relationships between different organisms within an ecosystem.

Therefore, the correct answer is "1 only."