Which of the following is the unit of productivity of an Ecosystem?

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Question

Which of the following is the unit of productivity of an Ecosystem?

Accepted Answer

Correct Answer: A — (KCal m⁻²) yr⁻¹Step-by-step Solution:Productivity in an ecosystem refers to the rate of biomass production per unit area per unit time. It is expressed in terms of energy (kcal) or dry weight (gm) per square meter per year. The standard unit for comparing productivity across ecosystems is (KCal m⁻²) yr⁻¹ or gm⁻² yr⁻¹. Option A includes the correct time dimension (yr⁻¹) and area dimension (m⁻²), making it the complete unit of productivity. Option B (gm⁻²) lacks the time dimension, so it cannot represent a rate. Option C (KCal m⁻²) also lacks the time dimension and only represents energy per area, not a rate. Option D (KCal m⁻³) incorrectly uses a volumetric unit (m⁻³) instead of area (m⁻²); productivity is measured per unit area of the ecosystem surface, not volume.Extended Explanation:Ecosystem productivity is classified into two types: Gross Primary Productivity (GPP) — the total rate of photosynthesis including the organic matter used for respiration during the measurement period; and Net Primary Productivity (NPP) — the rate of storage of organic matter in plant tissues in excess of the respiratory utilization by the producers (NPP = GPP − Respiration). Secondary productivity refers to the rate of formation of new organic matter by consumers. All these values are expressed in (KCal m⁻²) yr⁻¹ or g(dry weight) m⁻² yr⁻¹. Tropical rainforests and estuaries have the highest NPP (~2000 g m⁻² yr⁻¹), while deserts and open ocean have the lowest.Key Concepts: Ecosystem productivity, primary productivity, units of measurement, GPP vs NPP.

Which of the following is the unit of productivity of an Ecosystem?

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Which of the following is the unit of productivity of an Ecosystem?

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