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India’s wheat yield revolution in the 1960s was possible primarily due to

1. hybrid seeds
2. increased chlorophyll content
3. mutations resulting in plant height reduction
4. quantitative trait mutations

Correct answer: mutations resulting in plant height reduction

Solution

The Green Revolution wheat varieties were semi-dwarf, so they stayed shorter and did not fall over easily under heavy fertilizer use. This allowed more energy to go into grain production, making the yield jump possible.

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