Fewpal
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(a) List two ways by which carbon dioxide is ‘fixed’ in the environment.

(b) Name two diseases caused due to an increased content of pollutants in the air produced due to the burning of fossil fuels.

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(a) Carbon dioxide is fixed in the two following ways:

(i) By the process of photosynthesis in plants.

(ii) Many marine animals use carbonates dissolved in sea-water to make their cells.

(b) Diseases caused due to an increased content of pollutants in the air produced due to the burning of fossil fuels are- ophthalmic problems, skin injuries, gastro-intestinal, cardio-vascular and respiratory diseases and some types of cancer.

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