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A simplified representation of nitrogen cycle is given here.
Which of the following statements regarding ' \( X^{\prime} \), ' \( Y \) ' and ' \( Z \) ' is correct?
(a) ' \( X \) ' represents proteins which are added into the soil by the process of nitrogen fixation.
(b) ' \( Y \) ' represents ammonia which is formed by
decomposition of dead plant and animal remains.
(c) ' \( Z \) ' represents the process of nitrogen assimilation, by which nitrates are converted back into atmospheric nitrogen.
(d) ' \( Z \) ' represents the formation of nitrogen gas by putrefaction of plant and animal matter.
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