In maize, hybrid vigour is exploited by:

Inducing mutations

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Bombarding the seeds with DNA

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Crossing of two inbreed parental lines

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Harvesting seeds from the most productive plants

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Solution

The correct option is C Crossing of two inbreed parental lines
In maize, hybrid vigour or heterosis is exploited by crossing of two inbred parental lines. Hybrid varieties were first developed in maize, which is a cross-pollinated crop. In such crops, the parents of hybrid varieties are, ordinarily, inbred lines.

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