_______ is the source of carbon dioxide.

Sun

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Air

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Soil

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Water

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Solution

The correct option is B Air
Plants obtain the components essential for photosynthesis from different sources. The chlorophyll is present in the leaf. Carbon dioxide is obtained from the air. It enters the leaves through the stomata on the surface. The roots absorb water from the soil. The sunlight essential for this process is obtained by the leaves from the sun.

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Match the following air pollutants with their major source.

(i) Carbon monoxide (ii) Carbon- dioxide (iii) Sulphur dioxide

(a) Coal burn (b) Fossil fuels (c) Automobiles

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