Which one of the following help in absorption of phosphorus from soil by plants?
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Solution
Glomus aggregatum is a mycorrhizal fungus used as a soil inoculant in agriculture and horticulture. Its purpose is to increase the surface area of roots for nutrient absorption like phosphorus.
Which one of the following is not used in organic farming?
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Solution
Organic farming involves use of organic wastes and other biological material along with beneficial microbes to release nutrients to crop to increase the soil fertility in an ecofriendly, and pollution free environment. Glomus,earthworm and Oscillatoria can be used in organic farming while snail cannot.
A common biocontrol agent for the control of plant diseases is
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Solution
A common biocontrol agent for control of plant diseases is Trichoderma. Trichoderma is a free living fungus that exert biocontrol over several plant pathogens for the control of plant diseases. It is the natural method of pest and pathogen control.
Cryl endotoxins obtained from Bacillus thuringiensis are effective against
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Solution
Cry I endotoxins obtained from Bacillus thuringiensis are effective against bollworms. A bollworm is a common term for any larva of a moth that attacks the fruiting bodies of certain crops, especially cotton.
Human insulin is being commercially produced from a transgenic species of
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Solution
Human insulin is being commercially produced from a transgenic species of Escherichia coli. E. coli is a bacterium that is commonly found in the lower intestine of warm blooded animals.
Trichoderma harzianum has proved a useful micro organism for
Which one of the following pairs is wrongly matched ?
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Solution
Coliforms are a broad class of bacteria found in our environment, including the faeces of man and other warm-blooded animals. The presence of coliform bacteria in drinking water may indicate a possible presence of harmful, disease-causing organisms.
Two microbes found to be very useful in genetic engineering are
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Solution
Escherichia coli is a bacterium found in human colon.On this bacterium scientists have made extensive genetic experiments to make some vital chemicals like insulin. Another bacterium is Agrobacterium tumefaciens which causes crown gall in plants. It is extensively used for genetic experiments.
Farmers have reported over 50% higher yields of rice by using the biofertilizer
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Solution
Farmers have reported over 50% higher yields of rice by using the biofertilizer Azolla pinnata.
Which one of the following is non-symbiotic biofertilizer?
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Solution
Azotobacter is a free living nitrogen fixing bacterium,Rhizobium is symbiotic and found in the root nodules of leguminous plants, Anabaena occurs in association with Azolla. VAM is vesicular arbuscular mycorrhiza.