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Question
The mass of living material in a particular trophic level at a particular time is called
The mass of living material in a particular trophic level at a particular time is called
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Solution
The correct option is C standing crop
The mass of living material in a particular trophic level at a particular time is called the standing crop.
It is measured either in number or biomass (mass of living organisms) in a unit area.
The biomass of a species is expressed in terms of fresh or dry weight. Measurement of biomass in terms of dry weight is more accurate because moisture content might vary at certain conditions.
The rate at which organic matter/biomass is produced per unit area of an ecosystem, is known as productivity.
Productivity at the level of producers is known as primary productivity. It can be divided into gross primary productivity (GPP) and net primary productivity (NPP).
Gross primary productivity (GPP) is the rate of production of organic matter, by the process of photosynthesis by producers, per unit area. It is expressed in terms of weight (g –2 yr –1) or energy (kcal m–2 )yr –1
Net primary productivity (NPP) refers to the remainder of the gross production which is left after its use by the producers in the process of respiration.
Thus, NPP = GPP - respiration losses (R).
Secondary productivity is the rate at which the consumers/heterotrophs synthesise new organic matter.
The mass of living material in a particular trophic level at a particular time is called the standing crop.
It is measured either in number or biomass (mass of living organisms) in a unit area.
The biomass of a species is expressed in terms of fresh or dry weight. Measurement of biomass in terms of dry weight is more accurate because moisture content might vary at certain conditions.
The rate at which organic matter/biomass is produced per unit area of an ecosystem, is known as productivity.
Productivity at the level of producers is known as primary productivity. It can be divided into gross primary productivity (GPP) and net primary productivity (NPP).
Gross primary productivity (GPP) is the rate of production of organic matter, by the process of photosynthesis by producers, per unit area. It is expressed in terms of weight (g –2 yr –1) or energy (kcal m–2 )yr –1
Net primary productivity (NPP) refers to the remainder of the gross production which is left after its use by the producers in the process of respiration.
Thus, NPP = GPP - respiration losses (R).
Secondary productivity is the rate at which the consumers/heterotrophs synthesise new organic matter.
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