Assertion :Water hyacinth can be vegetatively propagated by offset. Reason: Water hyacinth is also known as "terror of Bengal".

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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Assertion is incorrect but Reason is correct.

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Vegetative reproduction in aquatic plants like water hyacinth takes place through offset. The offset is a runner which originates from leaf axil which runs horizontally having the rosette of leaves above and adventitious root below. Water hyacinth covers the whole surface of water bodies and causes other surface and underground plants to die due to lack of sunlight and absorbs the dissolved oxygen that causing fishes to die. Fish is the staple food of Bengal, So due to its scarcity, it disturbs the economic and normal life of people. Thus it is known as the terror of Bengal. Thus, the correct answer is option B.

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