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Question
Gross primary productivity of an ecosystem is 170 tons of organic matted and amount used in respiration is 50 tons. Calculate the net primary productivity of the ecosystem.
Gross primary productivity of an ecosystem is 170 tons of organic matted and amount used in respiration is 50 tons. Calculate the net primary productivity of the ecosystem.
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Solution
The correct option is A 120 tons
In a food chain, energy stored at the producer level is called as primary productivity. Energy stored at the consumer level is called as secondary productivity. Gross primary productivity is the rate of conversion of light energy into chemical energy of organic molecules in an ecosystem. Net primary productivity is the rate of storage of organic matter except which is utilized for the respiration by plants. In the given ecosystem, the gross primary productivity is 170 tons of organic matter. Out of these, 50 tons is used in respiration. Hence, the net primary productivity will be 170 - 50 = 120 tons.Thus, the correct answer is '120 tons.'
In a food chain, energy stored at the producer level is called as primary productivity. Energy stored at the consumer level is called as secondary productivity. Gross primary productivity is the rate of conversion of light energy into chemical energy of organic molecules in an ecosystem. Net primary productivity is the rate of storage of organic matter except which is utilized for the respiration by plants. In the given ecosystem, the gross primary productivity is 170 tons of organic matter. Out of these, 50 tons is used in respiration. Hence, the net primary productivity will be 170 - 50 = 120 tons.
Thus, the correct answer is '120 tons.'
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