Ncert Exercises & Solutions

Productivity is the rate of production of biomass expressed in

(i) kcal m^-3 yr^-1
(ii) gm^-2 yr^-1
(iii) g^-1 yr^-1
(iv) kcal m^-2 yr^-1

1. (ii)

2. (iii)

3. (ii) and (iv)

4. (i) and (iii)

Ans. (c) Productivity is the rate of production of biomass or organic matter by any trophic level per unit area over a time period. It s expressed/measured in terms of weight (e.g.

gm / m^{2} / {yr}^{2}

) or energy (e.g.

kcal / m^{2} / yr

).
Page 243, XII NCERT

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