Air around us Worksheet-6
True/False:
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Amphibians take in air with the help of tiny holes in their bodies called spiracles.
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Air is a mixture of several gases in which oxygen is about 22 % of air.
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Some aquatic animals such dolphins breathe with the help of lungs.
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Earthworm’s skin is moist with the help of a substance called mucous.
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1 % of air is made of only water vapour, dust, and smoke.
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Carbon dioxide is given out as a by-product after respiration.
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Amphibians such as frogs breathe with the help of lungs, when on land.
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Oxygen is not needed for respiration.
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Birds breathe through lungs and air sacs that are open all the time.
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Pollution is the removal of substances in the environment.
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Excessive burning of fuels such as wood, coal, and petroleum, machines releasing gases are some causes of air pollution.
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There are only two processes in water cycle.
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Nitrogen is used up during burning.
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Recycling of plastics is one way of reducing air pollution.
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Air pollution causes severe diseases like asthma and cholera.
Answer Key:
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False
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False
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True
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True
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False
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True
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True
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False
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True
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False
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True
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False
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False
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True
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False