Hybrid is produced by crossing between two genetically dissimilar parents. Pollen from male parent (Pollen parent) will pollinate, fertilize, and set seeds in the female (seed parent) to produce F1 hybrid seeds. For the production of a hybrid CROSSING between two parents is important, the crossing process will result in heterosis. In a self-pollinated cross, it is difficult to cross but in cross-pollinated crops, it is easier.

In nature to create genetic variability and for its wider adaptation in different environmental conditions, flowering plants have adopted many mechanisms for cross-pollination. Cross-pollination results in genetic heterogeneity and shows wider adaptations. Flowering plants have evolved a number of devices to encourage cross-pollination