Question

Breathing is a process that

(I) Provides oxygen to the body.

(II) Breaks down food to release energy.

(III) Helps the body to get rid of carbon dioxide.

(IV) Produces water in the cells.

Which of the following correctly defines the functions of breathing?

• A. (i) and (ii)
• B. (ii) and (iii)
• C. (i) and (iii)
• D. (ii) and (iv)

Answer 1

The correct option is C

(i) and (iii)

The correct option is C.

Explanation for the correct option:

1. Breathing is the physical process of taking air into the lungs and then expelling it out of the lungs.
2. Breathing happens unintentionally or without our conscious consent.
3. The body takes in oxygen-rich air during breathing, and carbon dioxide is released during breathing.

Explanation for the incorrect options:

Option A:

1. Breathing is a physical process by which oxygen-rich air enters our body.
2. Breathing does not help to break down food to release energy.

Option B:

1. Breathing is a physical process involving inhalation and exhalation.
2. Respiration is responsible for breaking down food to release energy.
3. Exhalation during breathing helps to get rid of the carbon dioxide richair.

Option D:

1. Breathing does not release energy by breaking down food.
2. There is no role of breathing in producing water in the cells.

Final answer: Breathing is the process of taking in oxygen and releasing carbon dioxide.