Mesozoic Reptile Evolution & Dinosaur Extinction — NEET Biology
✅ Asked in NEET 2024Giant ferns (pteridophytes) were present but they all fell to form coal deposits slowly. Some of these land reptiles went back into water to evolve into fish like reptiles probably 200 mya (e.g. Ichthyosaurs). The land reptiles were, of course, the dinosaurs. The biggest of them, i.e., Tyrannosaurus rex was about 20 feet in height and had huge fearsome dagger like teeth. About 65 mya, the dinosaurs suddenly disappeared from the earth. We do not know the true reason. Some say climatic changes killed them. Some say most of them evolved into birds. The truth may live in between. Small sized reptiles of that era still exist today.
NTA tests whether students understand that dinosaurs dominated during the Mesozoic era before their sudden extinction ~65 mya, and that some reptiles evolved into aquatic forms (Ichthyosaurs) while others possibly gave rise to birds. Students commonly mistake the extinction cause—the paragraph emphasizes uncertainty, not a single reason. The trap is choosing one definitive answer (climate change OR evolution into birds) when NEET expects you to recognize multiple theories exist. Key point: dinosaurs ruled for millions of years, some land reptiles returned to water, extinction remains debated, but modern small reptiles survived. The timeline (200 mya, 65 mya) and Tyrannosaurus rex details are testable facts.
Match List-I with List-II: (NEET 2024) List-I: A. Mesozoic Era B. Proterozoic Era C. Cenozoic Era D. Paleozoic Era List-II: I. Lower Invertebrates II. Fish and Amphibia III. Birds and Reptiles IV. Mammals Choose the correct answer from the options given below:
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