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प्रश्न
How has the bacterium Bacillus thuringiensis helped us in controlling caterpillars of insect pests?
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उत्तर
Bacillus thuringiensis produces endotoxin, which disrupts the gut lining of caterpillar larvae, killing them and controlling insect pests effectively. This toxin has been used in biopesticides and genetically modified Bt crops like cotton.
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संबंधित प्रश्न
With the help of a neat and labelled diagram explain VAM (vesicular arbuscular mycorrhizae).
Name and explain the type of interaction that exists in mycorrhizae and between cattle egret and cattle.
State the medicinal value and the bioactive molecules produced by Streptococcus, Monascus and Trichoderma.
Name the type of association that the genus Glomus exhibits with higher plants.
Explain the significant role of the genus Nucleopolyhedrovirus in an ecological sensitive area.
Why are baculoviruses considered good biocontrol agents?
State the difference in organic farmers approach from that of conventional pest control methods.
Give reasons for the following:
Nitrogenous fertilizers are not applied in fields where leguminous crops grow.
Give two examples of microbial pesticides with their hosts.
Why are the spores of Bacillus thuringiensis used as bioinsecticide?
How does the activity of each one of the following help in organic farming?
Mycorrhiza
Write a note on biocontrol agents.
What is mycorrhiza?
Which of the following statements regarding biocontrol agents are correct?
Which of the following is the INCORRECT statement with respect to biocontrol agents?
Identify the reason/s due to which Trichoclerma species is a potent biocontrol agent.
Which one of the following statements is WRONG in relation to transgenic Bt cotton plant?
Farmers have reported over 50% higher yield of rice by using which of the following biofertilizers?
Describe the main ideas behind the biological control of pests and diseases.
Many members of genus Glomus form a mycorrhizal association with plants. Elaborate how is this association beneficial to the plants.
Organic farmer use Trichoderma as biological control agents. Explain.
Organic farmer use Baculovirus as biological control agents. Explain.
Which of the following is incorrect regarding Bacillus thuringiensis?
A farmer grew 2 varieties of corn crops in fields A and B. He grew normal corn crops in field A and GM corn crops in field B. He observed corn borers attacked only in field A. To control it, spores of Bt were sprayed in field A.
- Name the gene in the spores responsible for the control of this pest.
- What effect will the spores of Bt have on the insect pest?
- How has field B developed resistance against this pest?
give any two examples of microbial herbicides.
Explain how Bacillus thuringiensis acts as a bio-control agent.
Why are the biocontrol agents preferred over the chemical pesticides?
