Advertisements
Advertisements
प्रश्न
Certain specific bacterial spores are mixed in water and sprayed over Brassica crop to control butterfly caterpillars.
Name this bacterium and its mode of action on the butterfly caterpillars.
उत्तर
Bacillus thuringiensis
Mode of action:
Certain Bacillus thuringiensis strains produce proteins that are lethal to several insects, including coleopterans (beetles), lepidopterans (tobacco bud worm, armyworm), and dipterans (flies, mosquitoes). During one stage of its growth, B. thuringiensis produces protein crystals. The Bt protein, a toxic insecticide, is present in these crystals. The B toxin protein is an inactive protoxin in bacteria, but when consumed by an insect, the inactive toxin is changed into an active form of the toxin by the gut's alkaline pH, which destroys the crystals. The middle gut epithelial cells' surface is where the activated toxin binds, opening gaps that eventually kill the insect by causing cell swelling and lysis.
APPEARS IN
संबंधित प्रश्न
Crystals of Bt toxin produced by some bacteria do not kill the bacteria themselves because −
What are Cry proteins?
Organic farmers prefer biological control of diseases and pests to the use of chemicals for the same purpose. Justify.
Answer the following question.
List any four ways by which GMOs have been useful for enhanced crop output.
Cry-genes have been introduced in:
Bt Cotton is resistant to ______.
Bt cotton is not ______.
Explain with the help of one example how genetically modified plants can:
- Reduce usage of chemical pesticides
- Enhance nutritional value of food crops
On spraying Bacillus thuringiensis on an infected cotton crop field the pests are killed by the toxin, however the toxin although produced by the bacteria does not affect it. Explain giving reason.
State any two benefits of Genetically modified crops.
