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Q2. (a) In humans, the exchange of gases occurs in the lungs. 1 E
In which part of the lungs does it take place?
(b) Oxygen is carried to the cells by the blood. In what form
is oxygen carried in the blood?

Q3. (a) Name the red pigment in blood which carries oxygen in 3 Av
the human body.

(b) Where does the blood absorb oxygen in the human
body? Explain.
Q4. List three differences between aerobic respiration and 3 Av
anaerobic respiration.
Q5. (a) Define anaerobic respiration. 3 D
(b) Write a word equation for this process.
(c) Name an Organism which uses anaerobic respiration.
Q6. Write down the equations and their products formed during 5 D
the breakdown of glucose -
(a) With the use of oxygen.
(b) In the absence of oxygen in muscle.
(c) In the absence of oxygen in yeast.

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