Choose the correct statement.

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All mammals are viviparous.

All cyclostomes do not possess jaws and paired fins.

All reptiles have a three-chambered heart.

All pisces have gills covered by an operculum.

answer is B.

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Detailed Solution

Cyclostomata (e.g., lamprey and hagfish) is included under Agnatha (jawless vertebrates). They lack jaws and paired fins.
(1) Not all mammals are viviparous. Prototherians (e.g., platypus) are oviparous (egg-laying).
(3) The heart is not three-chambered in all reptiles. Crocodiles have a fourchambered heart.
(4) Gills are covered by an operculum only in Osteichthyes. In Chondrichthyes, the gill-slits are naked, not covered by an operculum.

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