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B
40000
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C
5000
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D
10000
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Solution
The correct option is B 40000
40,000 varieties
There are more than 40,000 varieties of cultivated rice (the grass species Oryza sativa) said to exist. But the exact figure is uncertain. Over 90,000 samples of cultivated rice and wild species are stored at the International Rice Gene Bank and these are used by researchers all over the world.