Correct Option (c) crossing of two inbred parental lines
Explanation:
Hybrid vigour has been commercially exploited in different commercial crops like maize, sorghum, bajra, tomato, sugarbeet, Hybridisation or crossing of two unrelated individuals or parental lines leads to hybrid vigour or heterosis. It refers to the superiority of the hybrid over its parents. The changes in the progeny or hybrid can be seen with naked eyes. The main steps include, i.e. selection of parents, selfing of parents, emasculation, bagging, crossing of desired and selected parents and finally seed setting and harvesting.
