Multiple Choice QuestionsMinerals 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
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
D.
The enzyme nitrogenase catalyse the conversion of atmospheric N2 to NH3
Root nodules of leguminous plants harbour symbiotic bacteria, Rhizobium, which fixes atmospheric nitrogen and provides the plant with most or all of its nitrogen requirements. In return, they have access to a rich supply of carbohydrate. The fixation of atmospheric nitrogen (N2) to ammonia (NH3) occurs within the nodules, using the enzyme nitrogen cut this enzyme is very sensitive to oxygen and gets inhibited in oxygen rich environment. This problem is solved by leghaemoglobin, a pinkish-red, oxygen-binding, iron-containing protein present in root nodules. It functions as oxygen buffer, scavenges oxygen and provides the enzyme nitrogenase, a low oxygen environment in which nitrogen fixation can occur.
Manganese is required in
nucleic acid synthesis
plant cell wall formation
photolysis of water during photosynthesis
photolysis of water during photosynthesis
Which of the following is a symbiotic nitrogen fixer?
Glomus
Azotobacter
Frankia
Frankia
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