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Question
Assertion :Sponges do not show any animal nature. Reason: Sponges are sessile with no apparent way of capturing food or eliminating water.
Assertion :Sponges do not show any animal nature. Reason: Sponges are sessile with no apparent way of capturing food or eliminating water.
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Robert Grant(1857) was the first to recognise and prove the true animal nature of sponges, The animal nature of sponges was well established on the following grounds- (i) Sponge feed on in wafted solid particles. Their mode of nutrition is truly holozoic. (ii) Sponge cells are devoid of cellulose cell walls. (iii) The life cycle of sponges includes swimming ciliated larval stages resembling those of other marine animals. Sponges are sessile and digestion is very simple without any apparent way of coping food-eliminating wastes So the correct answer is 'A'.
Robert Grant(1857) was the first to recognise and prove the true animal nature of sponges, The animal nature of sponges was well established on the following grounds-
(i) Sponge feed on in wafted solid particles. Their mode of nutrition is truly holozoic.
(ii) Sponge cells are devoid of cellulose cell walls.
(iii) The life cycle of sponges includes swimming ciliated larval stages resembling those of other marine animals. Sponges are sessile and digestion is very simple without any apparent way of coping food-eliminating wastes
So the correct answer is 'A'.
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