(a) “Respiration is a vital function of the body”. Justify this statement.
(b) What is the main difference between aerobic respiration and anaerobic respiration? Give one example of each.
(c) What type of respiration takes place (i) in yeast, and (ii) in humans?
(a) Respiration is a vital function of the body as it provides energy for carrying out all the life processes which are necessary to keep the organism alive.
(b) Aerobic respiration
(i) Aerobic respiration takes place in the presence of oxygen.
(ii) Complete breakdown of food occurs in aerobic respiration.
(iii) The end products in aerobic respiration are carbon dioxide and water.
(iv) Aerobic respiration produces a considerable amount of energy.
Example: Human Beings.
Anaerobic respiration
(i) Anaerobic respiration takes place in the absence of oxygen.
(ii) Partial breakdown of food occurs in anaerobic respiration.
(iii) The end products in anaerobic respiration are ethanol and carbon dioxide (in yeast) and lactic acid (in animal muscles).
(iv) Much less energy is produced in anaerobic respiration.
Example: Yeast.
(c) (i) Anaerobic respiration.
(ii) Aerobic respiration.