NEET 2026
- Exam
- NEET
- Year
- 2026
- Subject
- Biology
- Chapter
- Chapter
NEET 2026 · Biology · Chapter
Given below is a reference to a diagrammatic representation of the...
Given below is a reference to a diagrammatic representation of the evolutionary history of vertebrates through geological periods. Match the labels A, B, C, and D in List I with their corresponding evolutionary groups in List II.
| List I | List II | ||
|---|---|---|---|
| A | Label A | 1 | Therapsids |
| B | Label B | 2 | Sauropsids |
| C | Label C | 3 | Thecodonts |
| D | Label D | 4 | Pelycosaurs |
Choose the correct answer from the options given below:
Options
- AA-1, B-4, C-3, D-2
- BA-4, B-1, C-2, D-3
- CA-4, B-2, C-1, D-3
- DA-2, B-3, C-4, D-1
Correct answer
B. A-4, B-1, C-2, D-3
Step-by-step solution
Based on the evolutionary history of vertebrates:
1. Early reptiles diverged into two main lineages: Synapsids and Sauropsids. Therefore, the branch labeled C represents Sauropsids.
2. The Synapsid lineage evolved into Pelycosaurs, which later gave rise to Therapsids, the direct ancestors of Mammals. Thus, label A represents Pelycosaurs and label B represents Therapsids.
3. The Sauropsid lineage (C) gave rise to Turtles, Lizards, Snakes, Tuataras, and Thecodonts.
4. Thecodonts further evolved into Crocodiles, Dinosaurs, and Birds. Thus, the branch labeled D represents Thecodonts.
Matching the labels with List II:
A Pelycosaurs (4)
B Therapsids (1)
C Sauropsids (2)
D Thecodonts (3)
Answer: A-4, B-1, C-2, D-3.
1. Early reptiles diverged into two main lineages: Synapsids and Sauropsids. Therefore, the branch labeled C represents Sauropsids.
2. The Synapsid lineage evolved into Pelycosaurs, which later gave rise to Therapsids, the direct ancestors of Mammals. Thus, label A represents Pelycosaurs and label B represents Therapsids.
3. The Sauropsid lineage (C) gave rise to Turtles, Lizards, Snakes, Tuataras, and Thecodonts.
4. Thecodonts further evolved into Crocodiles, Dinosaurs, and Birds. Thus, the branch labeled D represents Thecodonts.
Matching the labels with List II:
A Pelycosaurs (4)
B Therapsids (1)
C Sauropsids (2)
D Thecodonts (3)
Answer: A-4, B-1, C-2, D-3.