1. gm⁻² 2. KCal m⁻² 3. KCal m⁻³ 4. (KCal m⁻²)yr⁻¹

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

1. gm^-2

2. KCal m^-2

3. KCal m^-3

4. (KCal m^-2)yr^-1

Doubtly Asked 30 Oct 2026 NEET UG 2025 Practice test neet Save WhatsApp Report

Best answer

Answer: 4. (KCal m^-2)yr^-1

Key idea: Productivity is the rate of biomass or energy production per unit area per unit time.

So it needs an area and a time in the unit: (kcal m^-2) yr^-1. Options with only mass, only energy, or volume lack the time factor. Option 4.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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