Subject - General Science
Chapter - 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 statements is/are true?

a) i only
b) ii & iii only
c) i & iii only
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 following is/are true ?

a) i & ii only
b) ii & iii only
c) All of the above
d) None of the above

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