Question

7. Excess intake of ${\mathrm{O}}_2$ by a person results in several ill-effects. Which of the following activities leads to excess intake of ${\mathrm{O}}_2$?

• A. deep-sea diving
• B. mountaineering
• C. travelling in aeroplane
• D. walking on the moon

Answer 1

The correct option is A

deep-sea diving

Explanation:

• In the sea, pressure is more, so more amount of oxygen ${\mathrm{O}}_2$ gets dissolved in the blood.
• This excess oxygen when dissolved in the blood causes several health problems like nausea, dizziness, etc.
• So, deep-sea divers have to carry a cylinder that is filled with oxygen diluted with an inert gas like Helium$\left(\mathrm{He}\right)$.

Hence, option (A) is the correct answer.