Give reason and explain. Energy flow in an ecosystem is always unidirectional and nutrients are recycled. Also, give examples to prove the given statement.

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The flow of energy in the ecosystem is unidirectional. The energy enters the plants (from the sun) through photosynthesis during the making of food. This energy is then passed on from one organism to another in a food chain.

Energy given out by the organisms as heat is lost to the environment, it does not return to be used by the plants again. This makes the flow of energy in ecosystem 'unidirectional'. Thus, the flow of energy in the ecosystem is said to be unidirectional because the energy lost as heat from the living organisms of a food chain cannot be reused by plants in photosynthesis.

During the transfer of energy through successive trophic levels in an ecosystem, there is a loss of energy all along the path. No transfer of energy is 100 per cent. The energy available at each successive trophic level is 10 per cent of the previous level. Thus, there is a progressive decline (gradual reduction) in the amount of energy available as we go from producer level to the higher trophic levels of organisms.

The nutrient movement is a cyclic movement where the nutrients revolve round with an ecosystem, hence cyclic. Nutrients pass from abiotic nutrient stores, such as the soil and the atmosphere, into biotic, plant and animal stores (the biomass). The nutrients are then recycled, within the ecosystem, following death and decomposition.

for example - grass take energy from sun and 1% energy of total sun energy id absorbed in grass .
Now if grass hopper eats that grass than 10% of grass energy is trasfered into that which is 0.1% of total. And we know grass cannot eat tha grass hopper and if does so then also grass can get only 10% of grasshopper energy which is 0.1% of grass

From here we can say energy cannot be taken back so we can say energy is unidirectional

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