Statement-I: Cyclostomes are endoparasite in some fishes and bear 4 pairs of gill slits.
Statement-II : Chondrichthyes are fresh water animals and their skin is covered with ctenoid scales.
Text Solution
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A
Cyclostomes are not endoparasites but ectoparasites or predators on fishes, and they possess 6-15 pairs of gill slits instead of four, so statement I is incorrect. Chondrichthyes are predominantly marine animals with skin covered by placoid scales, not freshwater animals with ctenoid scales, making statement II also incorrect.
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