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Question

Which of the below processes are part of the carbon cycle?

I. Release of carbon dioxide by the process of respiration.
II. Decomposition of plants and trees leading to the formation of coal.
III. Conversion of organic compounds into ammonia through the process of ammonification.
IV. Formation of limestones.

A
I, II and III
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B
I, III and IV
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C
I, II and IV
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D
II, III and IV
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Solution

The correct option is C I, II and IV
Carbon cycle involves the movement of carbon in both its elemental and combined state on earth. During respiration, carbon dioxide is released into the atmosphere. Plants utilise this atmospheric carbon dioxide for their growth & development. Death and decay of living things leads to formation of coal which is made up of carbon. Limestones are formed by the sedimentation of carbonates of water. Ammonification is a part of the nitrogen cycle.

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