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प्रश्न
Which part of the plant is best suited for making virus-free plants and why?
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उत्तर
A plant’s apical and axillary meristems are ideal for producing virus-free plants. This is because the rate of division of a meristematic cell is faster than the rate of multiplication of a virus; hence, viruses are unable to infiltrate newly created meristematic cells. As a result, meristematic cells are virus-free despite the fact that the entire plant is infected. Using a meristem, a healthy plant can be rescued from a diseased plant using the micropropagation process. Virus-free plants such as bananas, sugarcane, and potatoes have been obtained using this method by scientists.
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संबंधित प्रश्न
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What is the major advantage of producing plants by micropropagation?
In the following questions/statements has four suggested answers. Rewrite the correct answer
Bt cotton is resistant to:
(A) Insects
(B) Herbicides
(C) Salt
(D) Drought
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?
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Which one of the followmg bacterium is used for the production of transgenic plants?
At what temperature milk gets pasteurised?
Bt toxin obtained from ______.
What is meant by the term bio-pesticide? Name and explain the mode of action of a popular bio-pesticide.
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RNA interference (RNAi) holds great potential as a therapeutic agent for the treatment of human diseases and as biocontrol agents in controlling pests in the field agriculture. An experiment was carried to study the use of 'RNAi' for the potential treatment of disorders of cholesterol metabolism. Some people possess genetic mutations with elevated levels of ApoB gene which predisposes them to coronary artery diseases. Lowering the amount ApoB can reduce the number of lipoproteins and lower the blood cholesterol. Tracy Zimmerman and her colleagues used RNAi in 2006 to reduce the level of ApoB in non human primates Cynomolgus monkeys. One group of monkeys were given RNAi treatment (small interfering RNAs, SiRNAs) (doses 1 mg/kg, SiRNAs), second group of monkeys were given RNAi treatment (doses 2.5 mg/kg, SiRNAs) and third group of monkeys were injected with saline. |
The results of the study are depicted in the graph below:
- How does the treatment with 2.5 mg/kg bring an effect on cholesterol metabolism when compared from 24 hours and 144 hours?
- Write any two natural sources from where dsRNA molecule could be obtained for silencing the specific mRNA.
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With the help of a suitable example, explain how cry-proteins acts as a biological pesticide.
