1.

Assertion Sponges are less specialised ones. Reason Sponges show least power of regeneration.A. Both Assertion and Reason are true and Reason is the correct explanation of AssertionB. Both Assertion and Reason are true but Reason is not the correct explanation of AssertionC. Assertion is true, but Reason is FalseD. Assertion is false, but Reason is true.

Answer» Correct Answer - C
Sponges are less specialisd, because they have no tissue system, order system , etc. All animals particularly the less specialised ones can replace their lost or injured part. The process is known as regeneration. Calcium and magnesium ions are necessary for regeneration.


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