Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Which of the following ecosystems has the highest rate of net primary productivity?

a. open ocean

b. temperate deciduous forest

c. tropical rainforest

d. desert and thornwoods

e. cultivated land

Summary Introduction


The Sun is the prime source of energy for all ecosystems, out of which approximately 1% of the energy is utilized by the plants for photosynthesis while the rest is either absorbed by water bodies, the atmosphere, or reflected back into space. Net primary productivity (NPP) is the chemical energy left after deducting the energy used by plants for respiration from GPP.


Justification/explanation for the correct answer:

Option (c) is given as tropical rainforest. Tropical rainforests lie in and around the equatorial regions. A tropical rainforest is hot as well as wet, and the soil is quite rich in nutrients. As the primary productivity depends on temperature, availability of nutrients, and annual precipitation, the rate of NPP is the highest in tropical rainforests. Hence, option (c) is correct.

Explanation for the incorrect answers:

Option (a) is given as open ocean. This is not correct because in the open ocean, sunlight penetrates the upper layer only and the nutrients settle at the bottom of the ocean. Thus, the productivity varies from one region to another. So, it is an incorrect option.

Option (b) is given as temperate deciduous forest. These forests occupy the temperate regions between the Tropic of Cancer/Capricorn and the Arctic/Antarctic Circle. The temperature is moderate to low with a moderate amount of rainfall...

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