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Definition of Biomass

In terms of t...

Question

In terms of the dry weight of organic matter, which of the following is related to the annual net primary productivity of the whole biosphere?

A

12 billion tonnes

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B

Environmental factor

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C

Herbivore species

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D

Availability of nutrients

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Solution

The correct option is A Availability of nutrients
Net primary productivity refers to the biomass available for consumption. The annual net primary productivity of the whole biosphere is 170 billions tons of dry weight. The availability of the mineral nutrients in an environment determines productivity.
Hence, the correct answer is 'Availability of nutrients'

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Similar questions

Q. The annual net primary productivity in terms of dry weight of organic matter of the whole biosphere is approximately

Q. Which of the following statement(s) about productivity is/are incorrect?
I. Gross primary productivity of an ecosystem is the rate of production of organic matter per unit area during photosynthesis.
II. Gross primary productivity is measured in terms of kcal/m²/year
III. Net primary productivity of oceans is much higher than that of land masses on earth.
IV. Gross primary productivity = Net primary productivity - Respiration losses (R)

Q. Consider the following four statements (A-D) and select the correct option stating which ones are true (T) and which ones are false (F). Statements :

(A) Vertical distribution of different species occupying different levels in a community is called stratification.
(B) Net primary productivity minus respiration losses is the gross primary productivity.
(C) Rate of biomass production is called decomposition
(D) Annual net primary productivity of oceans is 55 billion tons

Q. The annual net primary productivity of the whole biosphere is approximately.

Q. Assertion: Net primary productivity (NPP) is always more than gross primary productivity.
Reason: Net primary productivity (NPP) is the amount of organic matter that is lost by the producers during respiration.

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