Assertion :Water Hyacinth drains off oxygen from water and is seen growing in standing water Reason: It is an indigenous species of our country.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Water hyacinth is a native of South America. It is one of the worst floating aquatic weed. It grows very fast in eutrophic water source where inorganic substances like nitrogen and phosphorus compounds are dissolved in water. It covers the whole pond and endangers the other species like fish living in water. The vegetation of plant continuously falls to the bottom of the water reservoir and decay. This consumes oxygen dissolved in water. In standing water, it grows fast.
Water hyacinth was introduced in India for its brightly coloured flowers. It is not an indigenous species of our country.
Thus, the correct answer is option C.

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