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What are Cry proteins? - Biology

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प्रश्न

What are Cry proteins?

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उत्तर

Cry protein is a toxic protein coded by the cry gene. There are many types of cry proteins; for example, the proteins coded by the genes cryIAc and cryIIAb control cotton budworm, while cryIAb controls corn borer. 

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पाठ 12: Biotechnology and its Applications - Exercises [पृष्ठ २१६]

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एनसीईआरटी Biology [English] Class 12
पाठ 12 Biotechnology and its Applications
Exercises | Q 4 | पृष्ठ २१६

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संबंधित प्रश्‍न

What is a GMO?


What is the major advantage of producing plants by micropropagation?


Crystals of Bt toxin produced by some bacteria do not kill the bacteria themselves because −


Why do lepidopterans die when they feed on Bt cotton plant? Explain how does it happen.


List any five possible advantages of a GMO to a farmer.


Answer the following question.
List any four ways by which GMOs have been useful for enhanced crop output.


Answer the following question.
List one advantage and one disadvantage of an apomictic crop. 


Cry-genes have been introduced in:


At what temperature milk gets pasteurised?


Bt cotton is not ______.


Tobacco plants resistant to a nematode have been developed by the introduction of DNA that produces (in the host cells).


Expand GMO. How is it different from a hybrid?


Gene expression can be controlled with the help of RNA. Explain the method with an example.


Highlight any four areas where genetic modification of plants has been useful.


You have identified a useful gene in bacteria. Make a flow chart of the steps that you would follow to transfer this gene to a plant.


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.


"RNA interference has been used to produce transgenic tobacco plants to protect them from the infestation by specific nematodes." Explain the novel strategy exploited by the biotechnologists.


Name an organism that produce cry proteins.


How has man exploited cry proteins to his benefit?


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