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

(A)KCal m^-3
(B)(KCal m^-2) yr^-1
(C)gm^-2
(D)KCal m^-2

The NCERT line that answers it

Verbatim line

It is expressed in terms of $\text{g m}^{-2} \text{ yr}^{-1}$ or $(\text{kcal m}^{-2}) \text{ yr}^{-1}$ to compare the productivity of different ecosystems.

Chapter: Ecosystem
Section: 12.2 PRODUCTIVITY

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states that productivity is expressed in terms of '(kcal m^{-2}) yr^{-1}', which exactly matches the correct answer option B.

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