Microbes in Human WelfareHard

Question

A transgenic food crop which may help in solving the problem of night blindess in developing countries is

Options

A.Flavr savr tomatoes
B.starlink maize
C.Bt soybean
D.golden rice

Solution

Vitamin-A deficiency causes nightblindness among children. Vitamin-A deficiency often occurs where rice is the dstable food since, rice grain does not contain β carotene. Three transgenes phytoene synthase, phytoene desaturase, zeta carotene desaturase and lycopene cyclase activities were transferred into rice by Agrobacterium mediated transformation. The resulting treansgenic rice popularly celled Golden rice contains good quantities of β - carotene.
Flavr savr is genetically modified tomato, which remains fresh and retain their flavour much longer than normal due to blocking of synthesis of fruit softening enzyme polygalacturonase.

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