Justify the following statement in terms of ecosystem dynamics. “Nature tends to increase the gross primary productivity, while man tends to increase the net primary productivity”.
Justify the following statement in terms of ecosystem dynamics. “Nature tends to increase the gross primary productivity, while man tends to increase the net primary productivity”.
In the conditions of dynamics of ecosystem, the flow of energy moves from one trophic level to the another. $50 \%$ events of sunlight on the earth, are in photosynthetically active radiation. Plants capture $2$ to $10$ per cent of the $PAR$ to form $GPP.$
Maximum gross primary productivity during respiration and other biotic processes is of $90 \%$. Gross net primary productivity is used in respiration by plants. Subtracting respiration loses plants use GPP for respiration which is used in second trophic level $C$ herbivores and decomposers.
Gross primary productivity of an ecosystem is the rate of production of organic matter during photosynthesis.
Therefore to increase gross primary productivity in natural ecosystem, large amount of trees help in ecological system.
Net primary productivity is the available biomass for consumption to heterotrophs (herbivores and decomposers).
Human beings try to produce net primary productivity by producing other crops to fulfill their requirements, develop food.
$NPP$ (Formula to find net Primary productivity)
$\mathrm{NPP}-\mathrm{GPP}-\mathrm{R}$
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- [AIPMT 2012]
The zooplanktonic forms are
The zooplanktonic forms are
Choose correct answer.
$(1)$ Zooplanktons are primary producers in an aquatic ecosystem.
$(2)$ Decomposition is largely an oxygen requiring process.
$(3)$ In a natural ecosystem, fishes, wolf, etc. are carnivore.
$(4)$ The amount of energy decreases in each successive trophic level.
Choose correct answer.
$(1)$ Zooplanktons are primary producers in an aquatic ecosystem.
$(2)$ Decomposition is largely an oxygen requiring process.
$(3)$ In a natural ecosystem, fishes, wolf, etc. are carnivore.
$(4)$ The amount of energy decreases in each successive trophic level.
The number of individuals of a species in a particular ecosystem at a given time remains constant due to
The number of individuals of a species in a particular ecosystem at a given time remains constant due to
Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem?
Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem?