A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: A
Solution :
Coelenterates possess a very primitive type of nervous system. This system is composed of many nerve cell. In coelenterates, the separate mechanisms for digestion, respiration and excertion, 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.
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