Mineral NutritionHard
Question
Nitrogen-fixation in root nodules of Alnus is brought about by
Options
A.Bradyrhizobium
B.Clostridium
C.Frankia
D.Azorhizobium
Solution
Nitrogen is the most critical element. Molecular nitrogen cannot be utilized directly by plants. It has to be fixed or converted into compounds prior to utilization. Symbiotic nitrogen fixiation is accomplished by Rhizobium sp, which occurs on the roots of legumminous plants. Certain non-leguminous plans also form nodules tofix nitrogen. The best known example in temperate region is alder (Alnussp). The bacteria involved in nodule nodule formation is an Actinomycetes the Frankia.
Clostridium is anaerobic, saprotrophic free-living nitrogen fixing bacteria.
Bradyrhizobium sp are symbiont in plants of Paraspania and soybean.
The Azorhizobium form both stem and root nodules in Sesbania (aquatic plant).
Clostridium is anaerobic, saprotrophic free-living nitrogen fixing bacteria.
Bradyrhizobium sp are symbiont in plants of Paraspania and soybean.
The Azorhizobium form both stem and root nodules in Sesbania (aquatic plant).
Create a free account to view solution
View Solution Free