Which of the following statement(s) is(are) correct?
(i) Oxygen is warming in nature whereas carbon dioxide is cooling.
(ii) Air pollution cannot be caused by biological matter.
(iii) Volcanic eruptions add valuable life supporting gases into the atmosphere.
(iv) Since plants take up fixed nitrogen, they are not affected by air pollution.

(i) and (iii)

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(ii), (iii) and (iv)

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Only (iii)

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None of these

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Solution

The correct option is D None of these
Air pollution is the introduction of biological, chemical and particulate matter or gas, into the atmosphere which upsets its natural balance. It can also be caused by geological processes like a volcanic eruption, forest fires, etc. But these natural activities that can cause pollution happen over thousands of years. This gives ample time for the pollutants to either be neutralised or for life to adapt to the pollutants. Plants utilize fixed nitrogen for their nutritional requirements, but this does not protect them from environmental pollution. Many plants are more susceptible to some of the air pollutants than us. Most organic gases combining with moisture to form acid rain, also affects plants largely. Carbon dioxide is released as a byproduct of cellular respiration and is one of the most potent greenhouse gases, with its increased levels leading to global warming.

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Question 14
Which of the following statement(s) is (are) true about respiration?

(i) During inhalation, ribs move inward and the diaphragm is raised.
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(b) (ii) and(iii)
(c) (i) and (iii)
(d) (ii) and (iv)

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