2,4-D (2,4-dichlorophenoxyacetic acid ) is a potent stimulator of plant metabolism. Most sensitive to it is (are )

Options

A. phytoplankton
B. dicotyledons
C. monocotyledons
D. kentucky fescue grass

Answer

B

Explanation

2,4-D is applied to field and lawns to eliminate weeds . Most of the weeds are dicotyledonous plants which are more sensitive to the potent stimulator of plant metabolism. The proper concentration must be carefully adhered to so that when the material is applied , the weeds will be stimulated to metabolize at such a great rate that they will consume their own protoplasm and die while the monocytyledonous grasses (or crops ) will remain unharmed