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(MCQ) General Science: The Respiratory System

1. Consider the following statements.

(i) Sponges & Jelly fish lack specialised organ for gas exchange, so they take gases directly from water.
(ii) Flatworms & annelid use thin wall blood vessels known as capillaries.
(iii) Earthworms use their outer surfaces to exchange gas.

Which of the above are correct?

1. i only
2. ii & iii only
3. i & iii only
4. iii only

2. Consider the following statements.

(i) Frogs eliminate carbon dioxide 2.5 times as fast through their skin.
(ii) Eels obtain 60% of their oxygen through their skin.
(iii) Humans exchange only 1% of CO2 through their skin.

Which of the above are correct?

1. i & ii only
2. ii & iii only
3. i, ii & iii
4. None

3. Consider the following statements.

(i) In mammals breathing takes place through diaphragm.
(ii) Abdominal cavity contains viscera.
(iii) Thoracic cavity contains heart & lungs.

Which of the above are correct?

1. i & ii only
2. ii & iii only
3. i, ii & iii
4. iii only

4. Consider the following statements.

(i) During respiration the external intercostals muscles contract, lifting the ribe up & out.
(ii) We breathe 15-18 times a minute exchanging about 500 ml of air.
(iii) An average male adult can flush his lungs with 4 litre of air at each breath. This is called vital capacity.

Which of the above are false?

1. i, iii only
2. ii, iii only
3. None of the above
4. i & ii only

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