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10., , ‘How does oxygen content of the atmosphere get maintained?, , Ans: Oxygen content of the atmosphere is maintained through oxygen cycle. It is the second, most abundant element in the atmosphere. Oxygen is taken up for respiration, burning, and, other oxidative process thereby releases CO2 and water. Green plants again fix CO, from the, atmosphere to form glucose through photosynthesis and return oxygen to the atmosphere., Thus, oxygen content of the atmosphere is maintained in the balanced forms mainly, , exchange of respiration and photosynthesis., , , , , , , , , Atmospheric Oxygen, 0,, , Organic Molecules, Cy Hy O,, , , , , , , , Fig. Oxygen Cycle