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

What is golden rice?

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प्रश्न

What is golden rice?

Find out from the internet what is golden rice?

लघु उत्तरीय
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उत्तर १

Golden rice is a genetically modified variety of rice, Oryza sativa, which has been developed as a fortified food for areas where there is a shortage of dietary vitamin A. It contains a precursor of pro-vitamin A, called beta-carotene, which has been introduced into the rice through genetic engineering.

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उत्तर २

Golden rice is a transgenic variety of rice (Oryza sativa) containing good quantities of β-carotene (provitamin A) which is principle source of vitamin A. Since the grains of the rice are yellow in colour due to β-carotene, the rice is commonly called golden rice. It was developed at the Swiss Federal Institute of Technology by Professor Ingo Potrykus and Peter Beyer.

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अध्याय 10: Biotechnology and its Applications - EXERCISES [पृष्ठ १८७]

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एनसीईआरटी Biology [English] Class 12
अध्याय 10 Biotechnology and its Applications
EXERCISES | Q 11. | पृष्ठ १८७
नूतन Biology [English] Class 12 ISC
अध्याय 12 Biotechnology and Its Applications
NCERT EXERCISES WITH ANSWERS | Q 8. | पृष्ठ ५५६

संबंधित प्रश्न

Find out what the various components of the medium used for propagation of an explant in vitro are?


What are biofertilizers? Describe their role in agriculture. Why are they preferred to chemical fertilizers?

 

 

Explain the term biofortification.


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


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 ______.


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. 


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


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.


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