Advertisements
Advertisements
प्रश्न
How has the bacterium Bacillus thuringiensis helped us in controlling caterpillars of insect pests?
Advertisements
उत्तर
Bacillus thuringiensis produces endotoxin, which disrupts the gut lining of caterpillar larvae, killing them and controlling insect pests effectively. This toxin has been used in biopesticides and genetically modified Bt crops like cotton.
APPEARS IN
संबंधित प्रश्न
How do organic farmers control pests?
Name the bioactive molecules produced by Trichoderma polysporum and Monascus purpureus.
How do mycorrhizae act as biofertilizers? Explain.
Given below is a list of six micro-organisms. State their usefulness to humans.
- Nucleopolyhedrovirus
- Saccharomyces cerevisiae
- Monascus purpureus
- Trichoderma polysporum
- Penicillium notatum
- Propionibacterium sharmanii
Mention one advantage and one disadvantage to a farmer who uses them.
Explain the significant role of the genus Nucleopolyhedrovirus in an ecological sensitive area.
Why are baculoviruses considered good biocontrol agents?
State the difference in organic farmers approach from that of conventional pest control methods.
Give reasons for the following:
Nitrogenous fertilizers are not applied in fields where leguminous crops grow.
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.
What is mycorrhiza?
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 is TRUE regarding Bacillus thuringiensis?
Which of the following can be killed using Nosema locustae?
From the following which one is NOT a bacterial herbicide?
Identify the INCORRECT statement regarding Bacillus thuringiensis.
Which group features jointed appendages?
What for Nucleopolyhydro viruses are being used now a days?
Name any genetically modified crop.
Many members of genus Glomus form a mycorrhizal association with plants. Elaborate how is this association beneficial to the plants.
- Give an example of a genus of virus used as narrow spectrum insecticidal biocontrol agent.
- How does its use serve as an aid in overall integrated pest management programme?
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.
Why are the biocontrol agents preferred over the chemical pesticides?
Which one of the following is NOT a bioherbicide of bacterial origin?
