CBSE Class 10 Answered
Why we say energy flow in the biosphere is unidirectional ?
Asked by prabal | 14 Mar, 2018, 09:38: AM
Expert Answer
- In a food chain, along with food, transfer of energy also occurs from one trophic level to the other. The flow of energy which occurs along a food chain is called energy flow.
- Due to the loss of energy at each step, food chains consist of only three to four trophic levels. If there are many levels, then animals at the end of the food chain will not have enough food and energy to survive.
- The solar energy converted by the autotrophs into food energy cannot be reconverted into solar energy, and the energy which passes from the herbivores to the carnivores can never go back to the herbivores. The energy lost as heat cannot be returned to the plants and reused during photosynthesis.
- Therefore, the flow of energy through a food chain is always unidirectional.
Answered by Sheetal Kolte | 14 Mar, 2018, 10:16: AM
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