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
A.
Molybdenum
Molybdenum is absorbed as molybdate by plants. It is involved in nitrogen metabolism including nitrogen fixation. It is a component of enzyme nitrogenase and acts as an enzyme activator. Its deficiency cause chlorosis and necrosis, whiptail of cauliflower and premature leaf fall.
Copper is absorbed by the plant in ionic form. Its deficiency causes necrosis, die back in Citrus, reclamation in legumes.
Manganese is absorbed by the plants as a bivalent ion. It acts as the enzyme activator. Its deficiency causes interveinal chlorosis as well as yellowing of starch and their subsequent degenerate.
Zinc is needed for biosynthesis of IAA and also acts as the enzyme activator. Its deficiency causes chlorosis, little leaf, rosette, the white bud of maize and mottling of leaves.
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
Which of the following is a symbiotic nitrogen fixer?
Glomus
Azotobacter
Frankia
Frankia
Switch
