The function of leghaemoglobin in the root nodules of legumes is
(1) oxygen removal
(2) nodule differentiation
(3) expression of nif gene
(4) inhibition of nitrogenase activity
1. convert free nitrogen to nitrogen compounds
2. convert proteins into ammonia
3. reduce nitrates to free nitrogen
4. 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:
1. phosphorus and sulphur
2. sulphur and magnesium
3. magnesium and sodium
4. calcium and phosphorus
Which one of the following elements is not an essential micronutrient for plant growth?