Which one is a biofertilizer?
(a) VAM
(b) Sporeine
(c) Devine
(d) Agent Orange
Which of the following plants are used as green manure in crop fields and in sandy soils?
(a) Dicanthium annulatum and Azolla pinnata
(b) Crotalaria junecea and Alhagi camelorum
(c) Calotropis procera and Pitylanthus niruri
(d) Saccharum munja and Lantana camara
Basic slag is
(a) Water soluble phosphatic fertilizer
(b) Ciric acid and soluble phosphatic fertilizer
(c) Insoluble phosphatic fertilizer
VAM represents
(a) Saprophytic fungi
(b) Symbiotic fungi
(c) Saprophytic bacteria
(d) Symbiotic bacteria
Which one is a biofertilizer?
(a) NPK mixture
(b) Rhizobia in legume roots
(c) Rhizobia in farmyard manure
(d) Green manure
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Azolla enriches rice fields with nitrogen due to its association with?
(a) Anabaena
(b) Nostoc
(c) Rhizobium
(d) Frankia
Which is correct?
(a) Legumes fix nitrogen through bacteria in their leaves
(b) Legumes fix nitrogen independent of bacteria
(c) Legumes do not fix nitrogen
(d) Legumes fix nitrogen through bacteria in their roots
Which is correct about nitrogen fixation by legumes. They fix nitrogen through?
(a) Specialised bacteria in their roots
(b) Specialised bacteria in their leaves
(c) Independent of bacteria that live in their roots
(d) The statement is wrong
What is required for nitrogen fixation by Rhizobium?
(a) Potassium
(b) Phosphorus
(c) Nitrate
(d) Sodium
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If a wheat field is inoculated with Rhizobium
(a) Soil will become nitrogen rich
(b) Soil will be depleted of nitrogen
(c) Soil will become rich in calcium
(d) No effect on soil nitrogen
The best fertilizer for paddy is
(a) Azolla pinnata
(b) Bacillus megatherium
(c) Rhizobium meliloti
(d) Bacillus polymyxa
Green manuring enhances crop yield by
(a) 15 –25%
(b) 5 –10%
(c) 30 –50%
(d) 60 –70%
Which of the following is free living aerobic and nonphotosynthetic nitrogen fixing bacterium?
(a) Rhizobium
(b) Nostoc
(c) Azospirillum
(d) Azotobacter
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Which element plays an important role in nitrogen fixation?
(a) Mn
(b) Mo
(c) Zn
(d) Cu
The biofertilizer present in the roots of legumes is
(a) Anabaena
(b) Rhizobium
(c) Azospirillum
(d) All of these
Biofertilizers include
(a) Nitrogen fixing bacteria
(b) Nitrogen fixing cyanobacteria
(c) Mycorrhiza
(d) All of these
Biofertilizers include
(a) Cowdung manure and farmyard waste
(b) A quick growing crop ploughed back
(c) BGA/Anabaena and Azolla
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Which of the following plants is used as a biofertilizer?
(a) Nostoc
(b) Funaria
(c) Volvox
(d) Rhizopus
Aquatic fern which is an excellent biofertilizer
(a) Salvinia
(b) Marsilea
(c) Pteridium
(d) Azolla
Root nodules for nitrogen fixation of a non-leguminous tree possess
(a) Frankia
(b) Rhizobium
(c) Azotobacter
(d) Thiobacillus
Crop rotation is carried out for
(a) Increasing acidity of soil
(b) Decreasing fertility of soil
(c) Increasing fertility of soil
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Leghaemoglobin takes part in
(a) Energy release
(b) Stimulating growth of Rhizobium
(c) N2 absorption
(d) Protecting nitrogenase
Rhizosphere is the region where
(a) Rhizobium forms root nodule
(b) Bacterial and root nearly make contact
(c) Algae and root make contact
(d) Soil and root make contact
Composited manure is formed from
(a) Farmyard manure and green manure
(b) Organic wastes from which biogas has been extracted
(c) Rotted vegetable and animal refuse
(d) Farm refuse and household refuse
VAM is important for
(a) Breaking of dormancy
(b) Phosphate nutrition
(c) Water uptake
(d) Retarding flowering
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Which disease is caused in children due to excessive use of nitrate fertilizers?
(a) Septicemia
(b) Jaundice
(c) Methaemoglobinaemia
(d) Mumps
A green manure is
(a) Rice
(b) Sorghum
(c) Maize
(d) Sesbania
Which micro-organism is most commonly used as Bio-fertilizer of pulse legumes, oil legumes and fodder legumes ?
(a) Rhizobium
(b) Azolla
(c) Blue-green algae
(d) Azospirillum
Biofertilizers
(a) Kill pests
(b) Prevent pest growth
(c) Retain soil fertility
(d) All these
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Which of the following is NOT a fertilizer product?
(a) Urea
(b) Murate of Potash
(c) Di Amonium Phosphate
(d) All are fertilizers
Azolla is used as biofertilizer as it has
(a) Rhizobium
(b) Cyanobacteria
(c) Mycorrhiza
(d) Large quantity of humus
Green manure plants belong to
(a) Compositae
(b) Solanaceae
(c) Poaceae
(d) Leguminosae
Biofertilizers include
(a) Nitrogen fixing bacteria
(b) Nitrogen fixing cyanobacteria
(c) Both bacteria and cyanobacteria
(d) Bacteria, cyanobactria and mycorrhizal fungi
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Cow dung is appropriately used as
(a) Manure
(b) Fuel
(c) Medicine
(d) Building material
Red pigment (Leghaemoglobin) having affinity for oxygen is present in the roots of
(a) Mustard
(b) Soybean
(c) Carrot
(d) Radish
Most famous nitrogen fixing bacterium/biofertilizer is
(a) Nitrobacter
(b) Nitrococcus
(c) Rhizobium
(d) Nitrosomonas
Some blue green algae can be used as biofertilizer as they are
(a) Photosynthetic
(b) Surrounded by mucilage
(c) Growing every where
(d) Capable of fixing nitrogen
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Organic forming does not include
(a) Green manures
(b) Chemical fertilizer
(c) Crop rotation
(d) Compost and farmyard manures
