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Consider the following statements regarding biomass production.
- Gross primary productivity of an ecosystem is the rate of production of organic matter during photosynthesis.
- Net primary productivity is the available biomass for the consumption of heterotrophs.
- Secondary productivity is gross primary productivity minus respiratory losses.
Which of the above statements is/are correct?
- a)1 only
- b)1, 2
- c)1, 3
- d)1, 2, 3
Correct answer is option 'B'. Can you explain this answer?
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Consider the following statements regarding biomass production. Gross ...
The rate of biomass production is called productivity. It can be divided into gross primary productivity (GPP) and net primary productivity (NPP). Gross primary productivity of an ecosystem is the rate of production of organic matter during photosynthesis. A considerable amount of GPP is utilized by plants in respiration.
Gross primary productivity minus respiration losses (R), is the net primary productivity (NPP).
GPP – R = NPP
Net primary productivity is the available biomass for the consumption to heterotrophs (herbivores and decomposers).
Secondary productivity is defined as the rate of formation of new organic matter by consumers.
Gross primary productivity minus respiration losses (R), is the net primary productivity (NPP).
GPP – R = NPP
Net primary productivity is the available biomass for the consumption to heterotrophs (herbivores and decomposers).
Secondary productivity is defined as the rate of formation of new organic matter by consumers.
Most Upvoted Answer
Consider the following statements regarding biomass production. Gross ...
Gross Primary Productivity (GPP)
- Gross primary productivity refers to the total amount of organic matter produced by plants through photosynthesis in an ecosystem.
- It represents the rate of production of organic matter and is measured in terms of energy or biomass per unit area per unit time.
- GPP includes all the energy captured by plants through photosynthesis, regardless of whether it is used for growth or respiration.
Net Primary Productivity (NPP)
- Net primary productivity is the available biomass or energy that is left after plants have used some of the energy for their own respiration.
- It represents the energy or biomass available for consumption by heterotrophs (organisms that cannot produce their own food) in an ecosystem.
- NPP is obtained by subtracting the amount of energy used by plants for their own respiration from the GPP.
- NPP is a more relevant measure of energy available to consumers than GPP because it represents the amount of energy that can be transferred to higher trophic levels in a food chain.
Secondary Productivity
- Secondary productivity refers to the rate of formation of new organic matter by heterotrophs through their consumption of organic matter produced by autotrophs (plants).
- It represents the energy or biomass stored in the heterotrophs and is measured in terms of energy or biomass per unit area per unit time.
- Secondary productivity is calculated by subtracting respiratory losses (energy lost through respiration) from the GPP.
- It represents the amount of energy or biomass available to the next trophic level in a food chain.
Answer Explanation:
- Statement 1 is correct. Gross primary productivity (GPP) is indeed the rate of production of organic matter during photosynthesis.
- Statement 2 is correct. Net primary productivity (NPP) is the available biomass for the consumption of heterotrophs.
- Statement 3 is incorrect. Secondary productivity is not equal to GPP minus respiratory losses. It is the rate of formation of new organic matter by heterotrophs, which is obtained by consuming the organic matter produced by autotrophs.
Hence, the correct answer is option B, i.e. 1 and 2 are correct statements.
- Gross primary productivity refers to the total amount of organic matter produced by plants through photosynthesis in an ecosystem.
- It represents the rate of production of organic matter and is measured in terms of energy or biomass per unit area per unit time.
- GPP includes all the energy captured by plants through photosynthesis, regardless of whether it is used for growth or respiration.
Net Primary Productivity (NPP)
- Net primary productivity is the available biomass or energy that is left after plants have used some of the energy for their own respiration.
- It represents the energy or biomass available for consumption by heterotrophs (organisms that cannot produce their own food) in an ecosystem.
- NPP is obtained by subtracting the amount of energy used by plants for their own respiration from the GPP.
- NPP is a more relevant measure of energy available to consumers than GPP because it represents the amount of energy that can be transferred to higher trophic levels in a food chain.
Secondary Productivity
- Secondary productivity refers to the rate of formation of new organic matter by heterotrophs through their consumption of organic matter produced by autotrophs (plants).
- It represents the energy or biomass stored in the heterotrophs and is measured in terms of energy or biomass per unit area per unit time.
- Secondary productivity is calculated by subtracting respiratory losses (energy lost through respiration) from the GPP.
- It represents the amount of energy or biomass available to the next trophic level in a food chain.
Answer Explanation:
- Statement 1 is correct. Gross primary productivity (GPP) is indeed the rate of production of organic matter during photosynthesis.
- Statement 2 is correct. Net primary productivity (NPP) is the available biomass for the consumption of heterotrophs.
- Statement 3 is incorrect. Secondary productivity is not equal to GPP minus respiratory losses. It is the rate of formation of new organic matter by heterotrophs, which is obtained by consuming the organic matter produced by autotrophs.
Hence, the correct answer is option B, i.e. 1 and 2 are correct statements.
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Consider the following statements regarding biomass production. Gross primary productivity of an ecosystem is the rate of production of organic matter during photosynthesis. Net primary productivity is the available biomass for the consumption of heterotrophs. Secondary productivity is gross primary productivity minus respiratory losses.Which of the above statements is/are correct?a)1 onlyb)1, 2c)1, 3d)1, 2, 3Correct answer is option 'B'. Can you explain this answer?
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