A remarkable increase in rice production from 35 million tones to 89.5 million tones during 1960 - 2000 was mainly due to

Improved semidwarf varieties

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Introduction of golden rice

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Increased use of chemical fertilizers

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Cultivation of wild varieties

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Solution

The correct option is A Improved semidwarf varieties
Introduction of m IR-8 and Taichung Native-1 varieties of rice in 1966 resulted in a tremendous increase in rice production from 1960 – 2000.
The semidwarf varieties were smaller in size than the dwarf varieties and exhibited increased production.
So, the correct answer is option A.

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