Zoology-Origin of Life
NEET Zoology Origin of Life Assertion Reason Question
Type: Assertion Reason-assertion-Hard-Class 12
Assertion (A): The first cellular form of life originated approximately 2,000 million years ago. | Reason (R): Early Earth's atmosphere was devoid of oxygen and primarily composed of water vapor, methane, carbon dioxide, and ammonia.
A
Both A and R are true, and R is the correct explanation of A.
B
Both A and R are true, but R is not the correct explanation of A.
C
A is true, but R is false.
D
A is false, but R is true.
Correct Answer
Option A
Detailed Explanation
The NCERT context states that the first cellular life forms arose around 2,000 million years ago, and early Earth's atmosphere was composed of these gases, which played a role in the origin of life.
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