Identify the correct chronological sequence for evolution of reptiles.
(A) Therapsids
(B) Dinosaurs
(C) Pelycosaurs
(D) Thecodonts
Choose the correct answer for evolutionary history of vertebrates through geological periods from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (C), (D), (A), (B)
(C) Pelycosaurs — these come first. In the figure of the evolutionary history of vertebrates, the pelycosaur lineage is the lowest of the four, in the oldest geological period.
(D) Thecodonts — these come second. Their lineage branches off in a later period than that of the pelycosaurs. Dinosaurs and birds arose from this side of the reptile tree.
(A) Therapsids — these come third. They appear higher in the figure than the thecodonts, in a later period. Mammals arose from the line of the pelycosaurs and therapsids.
(B) Dinosaurs — these come last. They are drawn highest of the four in the figure, in the latest period, and the figure marks them as extinct.
Note: A similar question was also asked in CUET (UG) 2026 on 06-06-2026 (Slot 1).
NCERT Extract:
