Home PYQs UPPSC UPPSC MCQs Prelims 1999 (GS Paper I)

Question

Assertion (A): Insolation is the most important source of energy for the biospheric ecosystem.
Reason (R): Solar radiation is converted into food and chemical energy by green plants.

Codes:

  1. Both A and R are true and R is the correct explanation of A
  2. Both A and R are true but R is the correct explanation of A
  3. A is true but R is false
  4. A is false but R is true

Answer:

Option A: Both A and R are true and R is the correct explanation of A

Detailed Solution:

The correct answer is “Both A and R are true and R is the correct explanation of A”.

Insolation is the primary energy input for the biosphere. It's the solar radiation that reaches the Earth's surface. Green plants are the primary producers in the ecosystem. They convert solar energy (insolation) into chemical energy (food) through photosynthesis.