Advertisements
Advertisements
प्रश्न
How has man exploited cry proteins to his benefit?
Advertisements
उत्तर
The genes cry I Ac and cry II Ab encode proteins that control cottonbollworms, while cry I Ab controls corn borer. Plants having these proteins have natural insect resistance, making them a biopesticide.
APPEARS IN
संबंधित प्रश्न
Find out what the various components of the medium used for propagation of an explant in vitro are?
Organic farmers prefer biological control of diseases and pests to the use of chemicals for the same purpose. Justify.
Answer the following question.
How is a continuous culture system maintained in bioreactors and why?
Answer the following question.
Write the desirable characters a farmer looks for in his sugarcane crop.
Maize grain is a fruit known as ______.
In RNAi genes are silenced using ______.
Bt cotton is not ______.
Silencing of a gene could be achieved through the use of ______.
Insects in the Lepidopteran group lay eggs on maize crops. The larvae on hatching feed on maize leaf and tender cob. In order to arrest the spread of three such Lepidopteran pests, Bt maize crops were introduced in an experimental field.
A study was carried out to see which of the three species of lepidopteran pests was most susceptible to Bt genes and its product.
The lepidopteran pests were allowed to feed on the same Bt-maize crops grown on 5 fields (A-E).
The graph below shows the leaf area damaged by these three pests after feeding on maize leaves for five days.

Key for lepidopteran insect pest species
![]() |
Species I |
![]() |
Species II |
![]() |
Species III |
Insect gut pH was recorded as 10, 8 and 6 respectively for Species I, II and III respectively.
(a) Evaluate the efficacy of the Bt crop on the feeding habits of the three species of stem borer and suggest which species is least susceptible to Bt toxin.
(b) Which species is most susceptible to Bt-maize, and explain why?
(c) Using the given information, suggest why a similar effect was not seen in the three insect species.
The 'cry' gene transferred from Bacillus thuringiensis to a crop plant provides it with ______ properties.



