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Q5 Which of the following increases in muscle cells when they lack oxygen?
(a) Uric acid
(b) Lactic acid
(c) Lactose
(d) Carbon dioxide
Q6 Yeast converts Glucose into -
(a) Starch
(b) Alcohol
(c) Lactic acid
(d) Yogurt

Q7 Which of the following is not a product of aerobic respiration?
(a) Carbon dioxide
(b) Alcohol
(c) Energy
(d) Water

Q8 Why do we get, muscle cramps after heavy exercise?
(a) It is due to the partial breakdown of glucose to produce lactic acid.
(b) It is due to the complete breakdown of glucose to produce lactic acid.
(c) It is due to the muscle cells that respire in the presence of oxygen.
(d) It is due to the increased supply of oxygen to muscle cells.

Q9 Identify X in the given equation of aerobic respiration.

(a) Water
(b) Oxygen
(c) Ethyl alcohol
(d) Nitrogen

Q10 During respiration in humans, the exchange of gases takes place in -
(a) Bronchi
(b) Alveoli
(c) Bronchioles
(d) Trachea

SUBJECTIVE
Marks Level

Q1. Why does breathing become faster when we do physical 1 E
exercise?

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