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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

What is the major advantage of producing plants by micropropagation? - Biology

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प्रश्न

What is the major advantage of producing plants by micropropagation?

लघु उत्तरीय
विस्तार में उत्तर
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उत्तर १

Micropropagation is the process of producing thousands of plants through tissue culture. Each plant in this process is genetically identical to the original plant from which it originated. They are known as somaclones. Most of the important food plants, like tomatoes, bananas, apples, etc., have been produced on a commercial scale using this method.

This method can prepare thousands of plants in a very short period. Another important application of this method is recovering healthy plants from diseased plants. The virus infects the plant, but the meristem (apical and axillary) remains free. Therefore, scientists separate and cultivate the meristem in vitro to create virus-free plants. Scientists have succeeded in culturing meristems of banana, sugarcane, potato, etc.

Scientists have even isolated single cells from plants and, after digesting their cell walls, have been able to isolate naked protoplasts (surrounded by plasma membranes). Researchers can fuse isolated protoplasts from two different varieties of plants, each with a desirable character, to create hybrid protoplasts that can be further grown into a new plant. We refer to these hybrids as somatic hybrids and the process as somatic hybridization.

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उत्तर २

The major advantage of producing plants by micropropagation is that the plants produced are virus-free and genetically identical, and a large number of plants can be produced in a very short period. This technique ensures rapid propagation and disease-free planting material.

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Notes

Students should refer to the answer according to their question.

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अध्याय 11: Strategies for Enhancement in Food Production - NCERT EXERCISES WITH ANSWER [पृष्ठ ४८७]

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नूतन Biology [English] Class 12 ISC
अध्याय 11 Strategies for Enhancement in Food Production
NCERT EXERCISES WITH ANSWER | Q 4. | पृष्ठ ४८७

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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
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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.


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