Question

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Choose the correct answer
1. During respiration exchange of gases takes place in
(a) Trachea and larynx
(b) Alveoli of lungs
(c) Alveoli and throat
(d) Throat and larynx
2. The blood leaving the tissues becomes richer in
(a) Carbon dioxide
(b) Water
(c) Haemoglobin
(d) Oxygen
3. Lack of oxygen in muscles often leads to cramps among
cricketers. This results due to
(a) Conversion of pyruvic acid to ethanol
(b) Conversion of pyruvic acid to glucose
(c) Non-conversion of glucose to pyruvic acid
(d) Conversion of pyruvic acid to lactic acid
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Answer 1

1) alveoli of lungs

2) carbon dioxide

3) conversion of pyruvic acid to lactic acid