Assertion :Of all the taxa only one that exists in nature as biologically cohesive unit is species. Reason: Members of the same species can only interbreed.

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 and Reason is incorrect.

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Assertion is incorrect and 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.
The term species is given to the major subdivision of a genus and is considered a basic unit of biological classification. A species is, therefore, a cohesive unit made up of such members who are related biologically and resemble one another with an ability to breed among themselves, but not among another. However, even as the reason given for the assertion sounds appropriate, this does not apply to organisms that reproduce asexually and also many plants and some animals that form hybrids in nature.
Thus, the correct answer is option B.

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