In which of the following, all three are macronutrients

• Iron, copper, molybdenum

• Molybdenum, magnesium, manganese

• Nitrogen, nickel, phosphorous

• Nitrogen, nickel, phosphorous

The first stable product of fixation of atmospheric nitrogen in leguminous plants is

• NO₂^-

• ammonia

• NO₃^-

• NO₃^-

3.

During biological nitrogen fixation inactivation of nitrogenase by oxygen poisoning is prevented by

• Leghaemogolobin

• Xanthophyll

• Carotene

• Carotene

Best defined function of manganese in green plants is

• Photolysis of water

• Calvin cycle

• Nitrogen fixation

• Nitrogen fixation

Consumption of which one of the following foods can prevent the kind of blindness associated with vitamin ‘A’ deficiency?

• ‘Flaver Savr’ tomato

• Canolla

• Golden rice

• Golden rice

For its action, nitrogenase requires

• high input of energy

• light

• Mn²⁺

• Mn²⁺

Minerals known to be required in large amounts for plant growth include

• phosphorus, potassium, sulphur, calcium

• calcium, magnesium, manganese, copper

• potassium, phosphorus, selenium, boron

• potassium, phosphorus, selenium, boron

Which one of the following elements in plants is not remboilised?

• Calcium

• Potassium

• Sulphur

• Sulphur

Which one of the following is not an essential mineral elements for plants while the remaining three are?

• Iron

• Manganes

• Cadmium

• Cadmium

An element playing important role in nitrogen fixation is 

• Molybdenum

• copper

• manganese

• manganese