Assertion (A): The mass of living material in a particular trophic level at a particular time is called the standing crop

Reason (R): Measurement of biomass in terms of fresh weight is more accurate

Both the assertion and reason are true and the reason is the correct explanation of the assertion

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Both the assertion and reason are true but the reason is not the correct explanation for the assertion

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The assertion is true but the reason is false

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Both assertion and the reason are false

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Solution

The correct option is C The assertion is true but the reason is false
The mass of living material in a particular trophic level at a particular time is called the standing crop. It is measured either in number or biomass (mass of living organisms) in a unit area.

The biomass of a species is expressed in terms of fresh or dry weight.

Measurement of biomass in terms of dry weight is more accurate because moisture content might vary at certain conditions.

Hence, the assertion is true but the reason is false.

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