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P. 3

(a) storm
                       (b) lightning
                       (c) flood
                       (d) None of these.



               SUBJECTIVE

                      Questions                                                            Marks  Level

               Q1.  Why is Nitrogen essential for living organisms?                        1        E


               Q2.  Which natural phenomenon occurring in the sky is responsible  1                 E
                      for nitrogen fixation?

               Q3.  Name the microorganisms which can fix atmospheric nitrogen in  1                Av
                      the soil.


               Q4.  What is nitrogen fixation? How is it done?                             3        Av

               Q5.  Draw a neat, labelled diagram of nitrogen cycle in nature.             3        D


               Q6.  Define nitrogen cycle and state its importances.                       5        D
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