Hybrid vigour is mostly due to

Homozygosity of the pure characters

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Superiority of all the genes

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Heterozygosity

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Mixing of the male and the female cytoplasm

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Solution

The correct option is C Heterozygosity
The increase in the level of production traits due to crossing is called hybrid vigour or heterosis. Hybrid vigour is the increased vigour of the offspring over their both parents. Such offsprings (hybrids) are obtained between two genetically different pureline varieties (parents).

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In case of vegetatively propagated crops, pure-line selection is not required.

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