Question

Arrange the following geological periods in the correct chronological order:
I. Carboniferous
II. Jurassic
III. Cretaceous
IV. Tertiary
V. Triassic

• A. I, II, III, V, IV
• B. I, V, II, III, IV
• C. I, II, V, III, IV
• D. I, V, III, II, IV

Hint:

To remember the order: Think of it as a transition from the age of amphibians (Carboniferous), to reptiles (Triassic, Jurassic, Cretaceous), and finally mammals (Tertiary).

Answer 1

The Correct Option is B

Step 1: Understand the geological time framework
The Earth’s history is divided into broad eras and periods. The given periods fall under three major eras:
Paleozoic Era: Includes the Carboniferous
Mesozoic Era: Includes the Triassic, Jurassic, and Cretaceous
Cenozoic Era: Includes the Tertiary
Step 2: Arrange the periods chronologically Here is the sequence based on the standard geological time scale: 1. Carboniferous (late Paleozoic): ~359–299 million years ago
2. Triassic (early Mesozoic): ~252–201 million years ago
3. Jurassic (middle Mesozoic): ~201–145 million years ago
4. Cretaceous (late Mesozoic): ~145–66 million years ago
5. Tertiary (early Cenozoic): ~66–2.6 million years ago
So the correct order from oldest to youngest is: $$ \text{I (Carboniferous)} \rightarrow \text{V (Triassic)} \rightarrow \text{II (Jurassic)} \rightarrow \text{III (Cretaceous)} \rightarrow \text{IV (Tertiary)} $$ Step 3: Evaluate each option
(A) I, II, III, V, IV — Incorrect. Triassic must come before Jurassic.
(B) I, V, II, III, IV — Correct. Matches the actual geological timeline.
(C) I, II, V, III, IV — Incorrect. Triassic cannot follow Jurassic.
(D) I, V, III, II, IV — Incorrect. Cretaceous should not precede Jurassic.
Step 4: Final Answer
The correct chronological sequence is: $$ (B) I, V, II, III, IV $$