Plankton, Nekton and Benthos are not the components of one of ecosystems which is

Oceans

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Fresh water rivers

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Grassland

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Pond or lake

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Solution

The correct option is C Grassland
Plankton, Nekton and Benthos are not the components of Grassland ecosystem. Benthos includes animals that are components of ocean ecosystem. Nekton includes aquatic animals that can swim freely in water. Decomposers and plankton (phyto and zoo) are components of fresh water and salt water ecosystem.
Thus, the correct answer is 'Grassland.'

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