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प्रश्न
What is the major advantage of producing plants by micropropagation?
Write any two advantages of producing plants by micro-propagation.
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उत्तर १
The major advantage of micropropagation is the rapid vegetative multiplication of plants, in which each plant produced is genetically identical to the original (a somaclone).
उत्तर २
- Somaclones production: All the plants produced are genetically identical to the parent plant, preserving desirable traits.
- Year-round propagation: Plants can be grown continuously in a laboratory, independent of seasonal or weather conditions.
Notes
Students should refer to the answer according to their question.
संबंधित प्रश्न
Find out what the various components of the medium used for propagation of an explant in vitro are?
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
Answer the following question.
How is a continuous culture system maintained in bioreactors and why?
A cell swells up when kept in:
At what temperature milk gets pasteurised?
Assertion (A): In Bt cotton, B. thuringiensis produces a toxic insecticidal crystalline protein which destroys bollworms.
Reason (R): B. thuringiensis produces this toxic protein in an inactive form, but when an insect ingests this inactive protein, it is converted into active form of toxin due to the alkaline pH of gut which solubilises the crystals, which is responsible for the death of bollworm.
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 ______.
Explain with the help of one example how genetically modified plants can:
- Reduce usage of chemical pesticides
- Enhance nutritional value of food crops
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.
