Genetically modified crops

Explanation

(i) Crops developed with desired characters by integrating foreign gene with their genome are called as genetically modified crops.
(ii) High yielding varieties with resistance to disease, alkalinity, weeds other stresses like extreme cold and drought are produced.
(iii) A gene had been isolated from the bacterium bacillus thuringiensis and integrated with the gene of cotton and brinjal.
(iv) This improved variety- Bt cotton, Bt brinjal kills the pests and yield is maintained .
(iv) A gene synthesizing the vitamin A (Beta carotene) has been introduced in the variety of rice. this variety contains 23 times more amount of beta carotene than the original variety .
(v) Heribicide tolerant plant varieties are being developed. Due to this, it has become possible to selectively destroy the weeds.