Advertisements
Advertisements
प्रश्न
How do mycorrhizae act as biofertilizers? Explain.
Advertisements
उत्तर
Fungi are also known to form symbiotic associations with plants, this association is called mycorrhiza. The fungal symbiont in these associations absorbs phosphorus from soil and passes it to the plant. Plants having such associations show other benefits also, such as resistance to root-borne pathogens, tolerance to salinity and drought, and an overall increase in plant growth and development.
APPEARS IN
संबंधित प्रश्न
Name the type of association that the genus Glomus exhibits with higher plants.
What is VAM?
State the difference in organic farmers approach from that of conventional pest control methods.
Give two examples of microbial pesticides with their hosts.
Give the biological name of the following:
The fungus that is being developed as a bio-control agent.
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?
Explain how Bacillus thuringiensis acts as a bio-control agent.
What is the function of substances such as viridin, gliotoxin, and gliovirin produced by Trichoderma species?
Which bacterial pathogens are mentioned as being used in microbial herbicides to attack several weeds?
