Assertion :Unit of nervous tissue is cyton. Reason: The nerve tissue is developed from ectoderm.

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 D Assertion is incorrect but Reason is correct.
The basic, fundamental unit of nervous tissue is a neuron.
Vertebrates are triploblastic i.e. their embryo possesses three layers of cells at the initial stages. These layers are ectoderm, mesoderm, and endoderm. Each layer gives rise to a particular system. Nerve tissue is made up of ectoderm. Therefore, the reason is correct.
Hence, option D is correct.

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