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

which one of the following is not a micronutrient?

• Molybdenum

• Magnesium

• Zinc

• Zinc

The free-living, anaerobic nitrogen - fixer is 

• Beijerinckia

• Rhodospirillum

• Rhizobium

• Rhizobium

Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statement is not correct during the process of nitrogen fixation?

• Leghaemoglobin scavenges oxygen and is pinkish in colour

• Nodules act as a site for nitrogen fixation

• The enzyme nitrogenase catalyse the conversion of atmospheric N₂ to NH₃

• The enzyme nitrogenase catalyse the conversion of atmospheric N₂ to NH₃

Manganese is required in 

• nucleic acid synthesis

• plant cell wall formation

• photolysis of water during photosynthesis

• photolysis of water during photosynthesis

110.

Which of the following is a symbiotic nitrogen fixer?

• Glomus

• Azotobacter

• Frankia

• Frankia