(a) convert free nitrogen to nitrogen compounds
(b) convert proteins into ammonia
(c) reduce nitrates to free nitrogen
(d) oxidize ammonia to nitrates
An organism used as a biofertilizer for raising soyabean crop is
An element playing important role in nitrogen fixation is
Which one of the following is not a micronutrient?
The free-living, anaerobic nitrogen-fixer is
The common nitrogen-fixer in paddy fields is
Which of the folowing is a symbiotic nitrogen fixer?
About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and:
(a) phosphorus and sulphur
(b) sulphur and magnesium
(c) magnesium and sodium
(d) calcium and phosphorus
Which one of the following elements is not an essential micronutrient for plant growth?
A plant requires magnesium for
(a) holding cells together
(b) protein synthesis
(c) chlorophyll synthesis
(d) cell wall development