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Question

Which of the following is/are the source of the carbon cycle?

A
Carbon dioxide
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B
Carbon
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C
Carbonates
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D
All of these
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Solution

The correct option is A Carbon dioxide
The carbon cycle is based on carbon dioxide, which makes up a measly 0.03% of the earth’s atmosphere. The synthesis of organic compounds from carbon dioxide and water through photosynthesis utilizes only 10% of the seven billion metric tonnes of CO2 present in the atmosphere each year. This enormous amount of biological activity is because of the combined activity of photosynthetic bacteria, protists and plants.

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