In an ecosystem, if the net primary productivity (NPP) of the first trophic level is , what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem? [2024]
In the equation
| GPP - R = NPP |
GPP is Gross Primary Productivity
NPP is Net Primary Productivity
R here is ______. [2023]
respiratory loss
reproductive allocation
photosynthetically active radiation
respiratory quotient
(1)
Gross primary productivity (GPP) of an ecosystem is the rate of production of organic matter during photosynthesis. A considerable amount of GPP is utilised by autotrophs in respiration. Gross primary productivity minus respiration losses (R) is the net primary productivity (NPP).
GPP - R = NPP
In the equation, GPP – R = NPP
R represents [2021]
respiration losses
radiant energy
retardation factor
environment factor
(1)
A considerable amount of GPP is utilised by plants in respiration (R). The energy left after respiration and stored as organic matter in the producers per unit time and area is NPP.
NPP = GPP - R
In relation to Gross Primary Productivity and Net Primary Productivity of an ecosystem, which one of the following statements is correct? [2020]
Gross primary productivity is always less than Net primary productivity.
Gross primary productivity is always more than Net primary productivity.
Gross primary productivity and Net primary productivity are one and same.
There is no relationship between Gross primary productivity and Net primary productivity.
(2)
Gross primary productivity (GPP) is the rate of production of organic matter during photosynthesis. A considerable amount of GPP is utilised by plants in respiration. GPP minus respiration losses (R) is the net primary productivity (NPP).
GPP - R = NPP
Therefore, GPP is always more than NPP.
The mass of living material at a trophic level at a particular time is called [2015]
net primary productivity
standing crop
gross primary productivity
standing state
(2)
Standing crop is the total amount of living material in a specified population at a particular time, expressed as biomass (standing biomass) or its equivalent in terms of energy. The standing crop may vary at different times of the year; for example, in a population of deciduous trees between summer and winter.
In an ecosystem the rate of production of organic matter during photosynthesis is termed as [2015]
secondary productivity
net productivity
net primary productivity
gross primary productivity
(4)
The amount of energy accumulation in green plants as biomass or organic matter per unit area over a time period is known as primary productivity. The rate of total capture of energy, or the rate of total production of organic material (biomass), is known as gross primary productivity.
