Which among the following statements are correct regarding an ecosystem?

It is formed only of living organisms.

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It is formed only of abiotic components.

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In an aquatic ecosystem, a fish is dependant on abiotic factors for its survival.

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In an ecosystem, organisms react to any changes in their surroundings.

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Solution

The correct options are
C In an aquatic ecosystem, a fish is dependant on abiotic factors for its survival.
D In an ecosystem, organisms react to any changes in their surroundings.
$∙$ Ecosystem is formed by the interaction of biotic components with each other and their interaction with the abiotic components surrounding them.

$∙$ Interaction of a fish with abiotic factors like water and air, for their mobility and respiration respectively, forms a part of an aquatic ecosystem. This example also showcases the way organisms are dependant on abiotic factors for their survival.

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