1
Question
The rate of formation of new organic matter by rabbit in a grassland, is called
The rate of formation of new organic matter by rabbit in a grassland, is called
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Solution
The correct option is A Gross primary productivity
Introduction to productivity :
Productivity of an ecosystem refers to the rate at which organic matter/biomass is produced per unit area.
Net Primary productivity / Net productivity :
Net primary productivity (NPP) refers to the remainder of the gross production (produced during photosynthesis) which is left after its use by the producers or plants in the process of respiration. Net primary productivity is the biomass that is available for consumption to the heterotrophs, such as herbivores, carnivores, decomposers, etc., in an ecosystem.
Hence, NPP = GPP - Biomass lost due to respiration by plants
Secondary productivity :
Secondary productivity is the rate at which the consumers/heterotrophs synthesise new organic matter per unit area.
Rabbit is a herbivorous heterotroph. Thus the rate of formation of organic matter by a rabbit in a grassland is called secondary productivity.
Gross primary production:
Gross primary productivity (GPP) refers to the amount of organic matter produced by the process of photosynthesis, per unit area.
Final answer :
(D) Secondary productivity
Introduction to productivity :
Productivity of an ecosystem refers to the rate at which organic matter/biomass is produced per unit area.
Net Primary productivity / Net productivity :
Net primary productivity (NPP) refers to the remainder of the gross production (produced during photosynthesis) which is left after its use by the producers or plants in the process of respiration. Net primary productivity is the biomass that is available for consumption to the heterotrophs, such as herbivores, carnivores, decomposers, etc., in an ecosystem.
Hence, NPP = GPP - Biomass lost due to respiration by plants
Secondary productivity :
Secondary productivity is the rate at which the consumers/heterotrophs synthesise new organic matter per unit area.
Rabbit is a herbivorous heterotroph. Thus the rate of formation of organic matter by a rabbit in a grassland is called secondary productivity.
Gross primary production:
Gross primary productivity (GPP) refers to the amount of organic matter produced by the process of photosynthesis, per unit area.
Final answer :
(D) Secondary productivity
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