Choose the correct statement.

1. All cyclostomes do not possess jaws and paired fins.

2. All reptiles have a three-chambered heart.

3. All Pisces have gills covered by an operculum.

4. All mammals are viviparous.

Doubtly Asked 30 Oct 2026 NEET UG 2016 Phase 2 Practice test neet Save WhatsApp Report

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Answer: 1. All cyclostomes do not possess jaws and paired fins.

Cyclostomes (lampreys, hagfishes) have no jaws and no paired fins. Correct.
Crocodiles have a four-chambered heart, so not all reptiles have a three-chambered one. Wrong.
Cartilaginous fishes have no operculum. Wrong.
Monotremes like the platypus lay eggs. Wrong.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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