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प्रश्न
Organic farmers prefer the biological control of diseases and pests to the use of chemicals for the same purpose. Justify
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उत्तर १
Organic farmers prefer the biological control of disease and pest over the use of chemicals and pesticides because
1) They do not kill the useful and harmful life forms indiscriminately.
2) They are not toxic to human beings.
3) The natural predator-prey relationship and food chains will not get distorted.
4) It is a non-polluting practice.
उत्तर २
Chemical methods often kill both useful and harmful life forms indiscriminately. Eradication of the
creatures that are often described as pests in not only possible but also undesirable, for without them the beneficial predatory and parasitic insects which depend upon them as food or hosts would not be able to survive.
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संबंधित प्रश्न
With the help of a neat and labelled diagram explain VAM (vesicular arbuscular mycorrhizae).
Mention one advantage and one disadvantage to a farmer who uses them.
Give two examples of microbial pesticides with their hosts.
Give the biological name of the following:
The microbe used to control insect larvae growing on cotton.
Give the biological name of the following:
The fungus that is being developed as a bio-control agent.
Which of the following can be killed using Nosema locustae?
Which of the following is the host for microbial pesticide Beauveria bassiana?
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:
Define bioherbicides.
give any two examples of microbial herbicides.
