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प्रश्न
Give an example of a bacterium, a fungus and an insect that are used as biocontrol agents.
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उत्तर
Examples of biocontrol agents are:
- Bacterium: Bacillus thuringiensis (used against insect pests and mosquito larvae).
- Fungus: Trichoderma (controls many plant diseases).
- Insect: Ladybird (control aphids) and dragonflies (control mosquitoes).
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संबंधित प्रश्न
With the help of a neat and labelled diagram explain VAM (vesicular arbuscular mycorrhizae).
Name the bioactive molecules produced by Trichoderma polysporum and Monascus purpureus.
Explain the significant role of the genus Nucleopolyhedrovirus in an ecological sensitive area.
Why are baculoviruses considered good biocontrol agents?
Give reasons for the following:
Nitrogenous fertilizers are not applied in fields where leguminous crops grow.
Give the biological name of the following:
The fungus that is being developed as a bio-control agent.
How does the activity of each one of the following help in organic farming?
Mycorrhiza
______ are controlled by the microbial herbicide Phytophthora palmivora.
Identify the reason/s due to which Trichoclerma species is a potent biocontrol agent.
The free-living fungus Trichoderma can be used for ______.
Match the items in Column ‘A’ and Column ‘B’ and choose correct answer.
| Column I | Column II |
| A. Lady bird | i. Methano bacterium |
| B. Mycorrhiza | ii. Trichoderma |
| C. Biological control | iii. Aphids |
| D. Biogas | iv. Glomus |
The correct answer is:
How do microbes reduce the environmental degradation caused by chemicals?
Organic farmer use Baculovirus as biological control agents. Explain.
- Give an example of a genus of virus used as narrow spectrum insecticidal biocontrol agent.
- How does its use serve as an aid in overall integrated pest management programme?
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?
Define bioherbicides.
give any two examples of microbial herbicides.
Why are the biocontrol agents preferred over the chemical pesticides?
