Assertion : Coelenterates and flatworms show morphollaxis regeneration. Reason : In both of these, a body fragment can develop into complete organism.
A
Both Assertion and Reason are true and Reason is a correct explanation of Assertion
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B
Both Assertion and Reason are true but Reason is not a correct explanation of Assertion
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C
Assertion is true but Reason is false
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D
Both Assertion and Reason are false
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E
Assertion is false but reason is true
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Solution
The correct option is A Both Assertion and Reason are true and Reason is a correct explanation of Assertion Hydra (Coelenterata) is cut transversely into two or more parts. Then they can grow into a complete organism of smaller size and Planaria (flatworms) can also develop into a complete animal though of smaller size than the parental animal by morphallactic regeneration as in Hydra. In morphallaxis, any cut part of the organism regenerates into a whole organism.