In plant succession,when the climax community | vedclass

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(D) In ecological succession,the climax community represents the final,stable stage of the ecosystem.As the community reaches maturity,the rate of com

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Becomes stable

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(D) In ecological succession,the climax community represents the final,stable stage of the ecosystem.As the community reaches maturity,the rate of community respiration increases,and the biomass becomes high.Because the community is in a state of equilibrium with the environment,the gross primary productivity is largely balanced by the total respiration of the community.Therefore,the net primary productivity ($NPP$ = $GPP$ - $R$) tends to become stable or very low compared to the earlier seral stages,as the ecosystem reaches a steady state.

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

In plant succession,when the climax community is reached,the net productivity

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