Question

A. MCQs-Choose the correct answers.

1. During inhalation, diaphragm and rib muscles
(a) relaxes and contract respectively (b) both relax (c) contracts and relax respectively (d) both contract

2. Which of the following is not associated with respiration?
(a) lungs
(b) pharynx
(c) gills
(d) tracheae

3. Exhaled air contains more
(a) oxygen
(b) carbon dioxide
(c) nitrogen
(d) none of these

4. Breathing rate per minute in humans under normal conditions is
(a) 16-18 times
(b) 20-25 times
(c) 30-32 times
(d) 18-20 times

5. Which of the following respires only anaerobically?
(a) cockroach
(b) yeast
(c) fungi
(d) all bacteria

6. Exchange of gases in lungs between air and blood is called
(a) respiration {b) transpiration (c) external respiration (d) internal respiration​

Answer 1

Answer:

1ST:-(A)

2ND:-(C)

3RD:-(B

4TH:-(A)

5TH:-(D)

6TH:-(C)

Explanation:

FOLLOW AND MARK AS BRILLIANT

Answer 2

1.relaxes and contract respectively
2.gills
3.carbon dioxide
4.20-25 times
5.cockraoch
6.internal respiration