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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
Trichoderma konigi is a source of _______ enzyme.
(A) invertase
(B) lipase
(C) pectinase
(D) cellulase
How do mycorrhizae act as biofertilizers? Explain.
Mention one advantage and one disadvantage to a farmer who uses them.
Name the type of association that the genus Glomus exhibits with higher plants.
Why are baculoviruses considered good biocontrol agents?
Name a genus of fungi that forms a mycorrhizal association with plants.
Give two examples of microbial pesticides with their hosts.
Give an example of a bacterium, a fungus and an insect that are used as biocontrol agents.
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 can be killed using Nosema locustae?
Identify the INCORRECT statement regarding Bacillus thuringiensis.
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:
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?
Why are the biocontrol agents preferred over the chemical pesticides?
Which one of the following is NOT a bioherbicide of bacterial origin?
