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

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1. Which of the following causes for Hybrid vigour?

Heterozygosity
Chaisma
Crossing over
Linkage

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
Using tractors
Reduce ration holders

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