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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
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
Trichoderma konigi is a source of _______ enzyme.
(A) invertase
(B) lipase
(C) pectinase
(D) cellulase
How do organic farmers control pests? Give two examples.
Give reasons for the following:
Nitrogenous fertilizers are not applied in fields where leguminous crops grow.
Select the odd one from given herbicides.
Match the column A with B and rewrite correct pairs
A | B | |
I | Mycoherbicides | Cactoblastis |
II | Bacterial herbicides | Alternaria |
III | Insects as herbicides | Xanthomonas |
Which of the following statements regarding biocontrol agents are correct?
Name any genetically modified crop.
How has the bacterium Bacillus thuringiensis helped us in controlling caterpillars of insect pests?
Organic farmer use Trichoderma as biological control agents. Explain.
Which of the following is incorrect regarding Bacillus thuringiensis?