Q. The driving force of the ecosystem is

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Solution:

Energy flow is a sequential process of the movement of energy in an ecosystem through a series of organisms. Sun is the only source of energy, either direct or indirect, for all ecosystems on earth (except for deep-sea hydrothermal ecosystem).
Of the incident solar radiation, less than 50% of it is PAR. Plants capture only 2-10% PAR of incident solar radiation in the synthesis of organic matter.