Assertion :Nerve cells in coelenterate have complete co-ordination in their body. Reason: True nerve cells occur for the first time in coelenterate.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Coelenterates possess a very primitive type of nervous system. This system is composed of many nerve cells. In coelenterates, the separate mechanisms for digestion, respiration and excretion, reproduction etc evolved for the first time. Thus there is a constant need to maintain a coordination between these systems. Nerve cells are developed for this purpose for the first time in coelenterates. Nerve in Hydra is the beginning in the evolution for nervous system.
So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.

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