Question

Which of the following is a more accurate statement about respiration?

• A. $O_2$ must always be available for respiration
• B. $O_2$ combines with carbon to form $C{O}_2$
• C. $O_2$ combines with hydrogen to form $H_{2}O$
• D. Air is inhaled and exhaled only from stomata

Answer 1

The correct option is C $O_2$ combines with hydrogen to form $H_{2}O$

In physiology, respiration is defined as the transport of oxygen from the outside air to the cells within tissues, and the transport of carbon dioxide in the opposite direction. During aerobic respiration, the oxygen taken in combines with hydrogen to form water, and carbon dioxide is expeled out.