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
What are Cry proteins?
Answer the following question.
List any four ways by which GMOs have been useful for enhanced crop output.
GM crops especially Bt crops are known to have higher resistance to pest attacks. To substantiate this an experimental study was conducted in 4 different farmlands growing Bt and non Bt-Cotton crops. The farm lands had the same dimensions, fertility and were under similar climatic conditions. The histogram below shows the usage of pesticides on Bt crops and non-Bt crops in these farm lands.
- Which of the above 4 farm lands has successfully applied the concepts of Biotechnology to show better management practices and use of agrochemicals? If you had to cultivate, which crop would you prefer (Bt or Non- Bt) and why?
- Cotton Bollworms were introduced in another experimental study on the above farm lands wherein no pesticide was used. Explain what effect would a Bt and Non Bt crop have on the pest.
Maize grain is a fruit known as ______.
Bt brinjal is an example of transgenic crops. In this Btrefers to ______.
Golden rice is ______.
Golden Rice:
A. GM rice
B. Rich in Vit A
C. Prevents blindness
D. Bruise resistant
Silencing of a gene could be achieved through the use of ______.
Expand GMO. How is it different from a hybrid?
With the help of a suitable example, explain how cry-proteins acts as a biological pesticide.
