A) producers
B) biomass
C) solar energy
D) grassland
Correct Answer: C
Solution :
The driving force of an ecosystem is the solar energy which is obtained from sun, and is trapped by green plants for conversion into chemical energy. Only 10% of the energy is transferred from one trophic level to the next trophic level and rest of the energy is used up in biological activity and gets wasted in the environment.
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