Questions in diversity-of-life

Select	Question
	A free living anaerobic bacterium capable of $N_2$ fixation in soil is
	Which of the following is free-living aerobic non- photosynthetic nitrogen fixing bacterium
	Which of the following groups of plants are highly useful in increasing soil fertility
	For the production of which of the following, the activity of the fungus or micro-organisms is not required
	Root nodules contain
	Antibiotics are mostly obtained from
	The symbiotic nitrogen fixing bacteria present in root nodules of legumes belongs to genus
	Nitrogen fixing bacteria are associated with
	Which of the following is recently discovered gram positive non-leguminous nitrogen fixing bacterium
	Nitrifying bacteria, Nitrosomonas and Nitrobactor