A: In secondary productivity,no new organic m | vedclass

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(C) Secondary productivity is defined as the rate of formation of new organic matter by consumers.However,the assertion states that 'no new organic ma

Vedclass · Accepted Answer

Assertion is correct,but Reason is incorrect.

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(C) Secondary productivity is defined as the rate of formation of new organic matter by consumers.However,the assertion states that 'no new organic matter is formed',which is scientifically incorrect because consumers do synthesize their own biomass (tissues) using the energy derived from primary producers.The reason states that it is the utilisation of food manufactured by primary producers to build consumer biomass,which is a correct description of the process.Since the assertion is false and the reason is true,the correct option is $C$.

Column-$I$	Column-$II$
$(a)$ $\text{NPP}$ of ocean	$(i)$ $115$ billion tons
$(b)$ Annual $\text{NPP}$ of the whole biosphere	$(ii)$ $170$ billion tons
$(c)$ $\text{NPP}$ of terrestrial ecosystem	$(iii)$ $55$ billion tons
$(d)$ Secondary productivity	$(iv)$ Heterotrophs

$A$: In secondary productivity,no new organic matter is formed.
$R$: It is only the utilisation of part of food manufactured by primary producers in the building of consumer biomass.

Similar Questions

Assertion : Net primary productivity is gross primary productivity minus respiration.
Reason : Secondary productivity is produced by heterotrophs.

The biomass available for consumption by the herbivores and the decomposers is called:

The annual net primary productivity of the whole biosphere is approximately . . . . . . of dry weight of organic matter.

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$A$: In secondary productivity,no new organic matter is formed.$R$: It is only the utilisation of part of food manufactured by primary producers in the building of consumer biomass.