Herbicides are substances that are toxic to plants, and are used to destroy unwanted vegetation like weeds. Selective herbicides are meant to kill specific targets while leaving the desired crop relatively unharmed.

• The first generation seeds(F1) produced from crossing two genetically dissimilar parent species. • It is uneconomical to sae and repalnt the progeny of these seeds as the next generations give much lower yields • The technique of hybridization is much like biologically patenting a seed. No one else, neither the farmer nor a rival company can produce exactly similar seeds unless the parent lines, which are the seed company’s secret • Hybrid seeds are generally called sarkar beej.

A hybrid plant or animal has genes from two different species, and has been bred to have particular characteristics.