Question

Arrange the following ecosystems in increasing order of mean NPP (tonnes / ha / year):
A. Tropical deciduous forest
B. Temperate coniferous forest
C. Tropical rain forest
D. Temperate deciduous forest

• A. B < A < D < C
• B. D < B < A < C
• C. A < C < D < B
• D. B < D < A < C

Answer 1

The correct option is D B < D < A < C

Net primary productivity(NPP) is the biomass or storage of energy by green plants. It is equal to the gross primary productivity minus loss due to respiration. The productivity generally increases from polar regions toward the tropics, because of the increasing sunlight and temperature. Thus, the correct sequence will be:
Temperate coniferous forest < Temperate deciduous forest < Tropical deciduous forest < Tropical rain forest (B < D < A < C)