Ncert Exercises & Solutions

Productivity is the rate of production of biomass expressed in

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

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}

$gm / m^{2} / {yr}^{2}$ ) or energy (e.g.

kcal / m^{2} / yr

$kcal / m^{2} / yr$ ).
Page 243, XII NCERT

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