| I. In Rhizobium cobalt play an important role in nitrogen fixation and is an essential constituents of vitamin-B. |
| II. Cobalt found in ferns, takes part in growth. |
| III. The elements taken in the form of gas by |
| IV. Prokaryotes only in hydrogen. |
| Which of the statements given above are correct? |
A) I and II
B) I and III
C) II and III
D) I, II and III
Correct Answer: A
Solution :
The elements taken in the form of gas by prokaryotes is nitrogen.
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