(IGP) IAS Pre: GS - Science & Technology : Biology - The Respiratory System (MCQ -7)

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) Earthwans use their outer surfaces to exchange gas.

Which of the above are correct?
(a) i only
(b) ii&iii
(c) i& iii
(d) 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?
(a) i & ii
(b) ii&iii
(c) i, ii&iii
(d) 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?
a) i & ii
b) ii&iii
c) i, ii&iii
d) 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?
a) i, iii
b) ii, iii
c) None of the above
d) i & ii

5. Consider the following statements.
(i) In cells O2 helps in the breakdown of food.
(ii) The process of breakdown of glucose with O2 is called anrobic respiration.
(iii) The process of breakdown of food without O2 is called aerobic respiration.

Which of the above are correct?
a) i & ii
b) ii&iii
c) i only
d) iii

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