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Which part of the plant is best suited for making virus-free plants and why? - Biology

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प्रश्न

Which part of the plant is best suited for making virus-free plants and why?

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

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नूतन Biology [English] Class 12 ISC
पाठ 11 Strategies for Enhancement in Food Production
NCERT EXERCISES WITH ANSWER | Q 3. | पृष्ठ ४८७

संबंधित प्रश्‍न

What is a GMO?


What is golden rice?


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.
List any four ways by which GMOs have been useful for enhanced crop output.


Maize grain is a fruit known as ______.


A protoxin is ______.


Bt cotton is resistant to pest, such as lepidopteron, dipterans and coleopterans. Is Bt cotton also resistant to other pests as well?


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.


Name an organism that produces cry proteins.


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