Read the following statements regarding the physiological effects of plant growth regulators: (A) Auxins like 2,4-D are widely used as herbicides to kill mature monocotyledonous weeds. (B) Spraying sugarcane crop with gibberellins increases the length of the stem, thus increasing the yield. (C) Cytokinins help overcome the apical dominance. (D) Ethylene promotes root growth and root hair formation, helping the plants

Step-by-step solution

Statement (A) is incorrect because 2,4-D is widely used to kill dicotyledonous weeds, but it does not affect mature monocotyledonous plants. Statement (B) is correct as spraying sugarcane crops with gibberellins promotes internode elongation, increasing the yield by as much as 20 tonnes per acre. Statement (C) is correct as cytokinins act antagonistically to auxins and help overcome apical dominance. Statement (D) is correct as ethylene promotes root growth and root hair formation, which increases the absorption su