Read the following statements:
Statement-I: Special vascularised structures called gills are used by most of the aquatic arthropods and molluscs.
Statement-II: Lower invertebrates like sponges, coelenterates, flatworms etc., exchange oxygen with carbon dioxide by simple diffusion over their entire body surface.

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Both Statement I and Statement II are true

Statement I is correct, Statement II is wrong

Both Statement I and Statement II are wrong

Statement I is wrong, Statement II is correct

answer is B.

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Detailed Solution

Both the statements are true.

Special vascularised structures called gills are used by most of the aquatic arthropods and molluscs.

Lower invertebrates like sponges, coelenterates, flatworms etc., exchange oxygen with carbon dioxide by simple diffusion over their entire body surface.

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