Home PYQs UPPSC UPPSC MCQs Prelims 2000 (GS Paper I)

Question

When there is a decrease in the concentration of oxygen in the blood, the rate of breathing:

  1. decreases
  2. increases
  3. does not change
  4. first decreases, then increases

Answer:

Option B: increases

Detailed Solution:

The correct answer is “increases”.

The answer is: (2) increases.

When the body detects a decrease in blood oxygen concentration (hypoxia), a reflex response triggers an increase in the breathing rate. Faster breathing helps to bring more oxygen into the lungs and expel carbon dioxide, a waste product of cellular respiration.