Question

44. Inhalation of this gas is essential for us

• A. Carbon dioxide
• B. Carbon monoxide
• C. Oxygen
• D. Hydrogen

Answer 1

The correct option is C

Oxygen

Explanation of correct option:

(C) Oxygen:

• Oxygen helps organisms need to grow and break down food to get the energy to sustain life.

Explanation of incorrect option:

(A) Carbon dioxide:

• During the process of respiration, we breathe in oxygen and breathe out carbon dioxide.

(B) Carbon monoxide:

• It is a poisonous gas that can mix with blood and reduce the amount of oxygen in the blood which causes death.

(D) Hydrogen:

• It is not a toxic gas but it does not help organisms to grow and break down food to get the energy to sustain life.

Conclusion: Hence, option (C) is correct.