UPSC CSE Prelims
Question 89
Which one of the following sets of elements was primarily responsible for the origin of life on the Earth?
View correct answer and explanation
Correct answer: B
Correct Option: B
Explanation: Carbon, hydrogen and nitrogen are fundamental constituents of complex organic molecules important for life’s emergence.
Option-wise Analysis:
A: Incorrect - Sodium is not a principal element of the original organic molecular framework.
B: Correct - Correct: C, H and N are essential building blocks of amino acids, nucleic acids and other organics.
C: Incorrect - Calcium and phosphorus matter biologically but this grouping omits carbon and hydrogen.
D: Incorrect - Potassium is physiologically important but not a principal foundational organic building block.