Role Of Auxin

Auxins are plant hormones that play a crucial role in regulating growth and development in plants. When applied in high concentrations, auxins cause abnormal growth in plants, especially dicots, leading to the death of these plants. However, monocotyledonous plants, such as grasses, are less affected by auxins. This is because monocots have a different structure and metabolic response compared to dicots, making them less susceptible to the growth-disrupting effects of auxins.

Auxins are plant hormones that can promote growth in plants by enhancing cell division and elongation. They are effective in controlling weed growth but have minimal effect on mature monocots like grasses, which are more resistant to auxins compared to dicots.

Thus, the correct answer is (3) does not affect mature monocotyledonous plants.