"Respiration is a vital function of the body". Justify this statement.

Describe the exchange of gases which takes place in the leaves of a plant (a) during daytime, and (b) at night.

Which contains more carbon dixoide: exhaled air or inhaled air? Why?

What is the main difference between aerobic respiration and anaerobic respiration? Give one example of each.

What type of respiration takes place (i) in yeast, and (ii) in humans ?