LIFE SCIENCE

Detailed explanation-1: -Herbicides do not prevent weeds from germinating but they kill weeds as they grow through the herbicide-treated zone by affecting the cell division in the emerging seedling. Dithiopyr and pendimethalin are preemergence herbicides.

Detailed explanation-2: -These herbicides are applied to the soil to control target vegetation before emergence by inhibiting root growth. Applied pre-planting to control annual grasses and broadleaf weeds among crops such as corn and soybeans.

Detailed explanation-3: -herbicide, an agent, usually chemical, for killing or inhibiting the growth of unwanted plants, such as residential or agricultural weeds and invasive species. A great advantage of chemical herbicides over mechanical weed control is the ease of application, which often saves on the cost of labour.