Nitrogen comprises 78 to 79 per cent of the earth’s atmosphere. It is an important constituent of plant and animal protein, which forms the structural and functional component of cells. Nitrogen is also present in DNA, RNA, vitamins, urea and alkaloids. Before studying the nitrogen cycle, you should understand the following processes.
Atmospheric nitrogen is used only by a few simple organisms. Nitrogen is converted to complex compounds in organisms. These are finally converted to nitrogen in the atmosphere. The cyclic pathway by which nitrogen is circulated continuously through the living and nonliving components of the biosphere is called the nitrogen cycle
________________ is converted to complex compounds in organisms. | |||
Right Option : C | |||
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How is nitrogen returned to atmosphere? | |||
Right Option : C | |||
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In nitrogen cycle the bacteria, which change proteins to ammonia, are known as ______________ | |||
Right Option : C | |||
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