Discussion
Which one of the following is a free-living photosynthetic nitrogen fixer?
Answer: C
The free-living photosynthetic nitrogen fixer is Rhodospirillum.
Rhodospirillum rubrum is a purple non-sulphur bacterium: it carries out anoxygenic photosynthesis, lives freely in water and mud, and has nitrogenase, so it fixes nitrogen without a host.
Frankia (an actinomycete with alder and other non-legumes) and Rhizobium (with legumes) fix nitrogen mainly in symbiotic root nodules and are not photosynthetic. Clostridium is free-living and fixes nitrogen, but it is an anaerobic heterotroph, not photosynthetic.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development