MCQ
Nif genes occur in:
- ARhizobium
- BPenicillium
- CAspergillus
- DStreptococcus
Explanation:
Nif is a nitrogen fixation gene which occurs in Rhizobium. It fixes atmospheric nitrogen into a form of nitrogen available to living organisms. The nif genes are found in both free - living nitrogen - fixing bacteria and symbiotic bacteria associated with various plants.
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| $(I)$ | $(II)$ | $(III)$ |
| $(a)$ Parasitism | $(i)\,-,0$ | $(A)$ Both get benefitted |
| $(b)$ Amensalism | $(ii)\,-,-$ | $(B)$ One get harmed other has no effect |
| $(c)$ Competition | $(iii)\,+,-$ | $(C)$ Both get harmed |
| $(d)$ Mutualism | $(iv)\,+,+$ | $(D)$ One is harmed and second is benefited |