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WorksheetsMineral Nutrition
Total questions: 18
Worksheet time: 11mins
Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is not correct during this process of nitrogen fixation?
Leghaemoglobin scavenges oxygen and it is pinkish in colour.
Nodules act as sites for nitrogen fixation.
The enzyme nitrogenase catalyses the conversion of atmospheric N2 to NH3 .
Nitrogenase is insensitive to oxygen.
Study the cycle shown below and select the option which gives the correct word for all the four blanks A, B, C and D
A: Nitrification, B: Ammonification, C: Animals, D: Plants
A: Denitrification, B: Ammonification, C: Plants, D: Animals
A: Nitrification, B: Denitrification, C: Animals, D: Plants
A: Denitrification, B: Nitrification, C: Plants, D: Animals
An element playing important role in nitrogen fixation is
Molybdenum
Copper
Manganese
Zinc
Which one of the following is not a micronutrient?
Molybdenum
Magnesium
Zinc
Boron
The free-living, anaerobic nitrogen-fixer is
Beijerinckia
Rhodospirillum
Rhizobium
Azotobacter
The common nitrogen-fixer in paddy fields is
Rhizobium
Azospirillum
Oscillatoria
Frankia
Which one of the following is not an essential mineral element for plants while the remaining three are?
Iron
Manganese
Cadmium
Phosphorus
The function of leghaemoglobin in the root nodules of legumes is
Oxygen removal
Nodule differentiation
Expression of nif gene
Inhibition of nitrogenase activity
Nitrifying bacteria
Convert free nitrogen to nitrogen compounds
Convert proteins into ammonia
Reduce nitrates to free nitrogen
Oxidize ammonia to nitrates
Which one of the following elements in plants is not remobilized?
Calcium
Potassium
Sulphur
Phosphorus
For its action, nitrogenase requires
Light
Mn2+
Super oxygen radicals
High input of energy
Which one of the following is a wrong statement?
Anabaena and Nostoc are capable of fixing nitrogen in free-living state also
Root nodule forming nitrogen fixers live as aerobes under free-living conditions.
Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins.
Nitrosomonas and Nitrobacter are chemoautotrophs.
The first stable product of fixation of atmospheric nitrogen in leguminous plants is
NO2-
NO3-
Ammonia
Glutamate
Deficiency symptoms of nitrogen and potassium are visible first in
Senescent leaves
Young leaves
Roots
Buds
Mineral known to be required in large amounts for plant growth include:
Phosphorus, potassium, sulphur, calcium
Calcium, magnesium, manganese, copper
Potassium, phosphorus, selenium, boron
Magnesium, sulphur, iron, zinc
During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by:
Xanthophyll
Carotene
Cytochrome
Laghaemoglobin
In which of the following all three are macronutrients?
Boron, zinc, manganese
Nitrogen, Calcium, Magnesium
Molybdenum, magnesium, manganese
Nitrogen, nickel, phosphorus
Which is essential for the growth of root tip?
Fe
Ca
Mn
Zn
