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(D) Net primary productivity $(NPP)$ is the amount of biomass or energy stored by producers per unit area per unit time,after accounting for respirato

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$B < D < A < C$

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(D) Net primary productivity $(NPP)$ is the amount of biomass or energy stored by producers per unit area per unit time,after accounting for respiratory losses.In general,productivity is highest in tropical regions due to abundant sunlight,high temperature,and sufficient rainfall,and lowest in polar or temperate regions.The approximate mean $NPP$ values are:$1.$ Temperate coniferous forest: $\approx 8 	ext{ Tonnes/ha/year}$$2.$ Temperate deciduous forest: $\approx 12 	ext{ Tonnes/ha/year}$$3.$ Tropical deciduous forest: $\approx 15 	ext{ Tonnes/ha/year}$$4.$ Tropical rain forest: $\approx 22 	ext{ Tonnes/ha/year}$Therefore,the increasing order is $B < D < A < C$.

Arrange the following ecosystems in increasing order of mean $NPP$ (Tonnes / ha / year):
$A.$ Tropical deciduous forest
$B.$ Temperate coniferous forest
$C.$ Tropical rain forest
$D.$ Temperate deciduous forest

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Arrange the following ecosystems in increasing order of mean $NPP$ (Tonnes / ha / year):$A.$ Tropical deciduous forest$B.$ Temperate coniferous forest$C.$ Tropical rain forest$D.$ Temperate deciduous forest