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प्रश्न
What is mycorrhiza?
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उत्तर
Mycorrhiza is a fungus. It forms symbiotic associations with the underground parts, like rhizomes and roots of higher plants occurring in thick, humid forests.
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संबंधित प्रश्न
Name a genus of baculovirus.
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.
How do mycorrhizae act as biofertilizers? Explain.
Give reasons for the following:
Nitrogenous fertilizers are not applied in fields where leguminous crops grow.
Organic farmers prefer the biological control of diseases and pests to the use of chemicals for the same purpose. Justify
Give the biological name of the following:
The microbe used to control insect larvae growing on cotton.
Which of the following is the INCORRECT statement with respect to biocontrol agents?
Which of the following is the host for microbial pesticide Beauveria bassiana?
Which group features jointed appendages?
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:
What for Nucleopolyhydro viruses are being used now a days?
How has the bacterium Bacillus thuringiensis helped us in controlling caterpillars of insect pests?
How do microbes reduce the environmental degradation caused by chemicals?
Describe the main ideas behind the biological control of pests and diseases.
Organic farmer use Trichoderma as biological control agents. Explain.
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?
