A) Crossing of two inbred parental lines.
B) Harvesting seed from the most productive plants.
C) Inducing mutations.
D) Bombarding the seeds with DNA.
Correct Answer: A
Solution :
Hybrid vigour is also called Heterosis which is measured in terms of size growth rate/field and number of other characters. Hybridisation increases the vigour and fertility. It is exploited by the crossing of two in bred parental lines. It is best maintained in vegetatively reproducing crops because of the genetic recombinations. Hence, the correct option is (a).
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