Multiple choice questions XXXVI — task. Science CBSE, Class 9.

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1. Which of the following causes for Hybrid vigour?

Linkage
Heterozygosity
Chaisma
Crossing over

2. To increase crop yield in plants like wheat which of the following is the best method.

Sowing seeds of improved varieties
Eradication of weeds
Reduce ration holders
Using tractors

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