(A) Gibberellins $(GA)$ are plant growth regulators that primarily promote the elongation of stems and internodes. They stimulate the activity of the

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(A) Gibberellins $(GA)$ are plant growth regulators that primarily promote the elongation of stems and internodes. They stimulate the activity of the intercalary meristem,which leads to an increase in the length of the plant axis. Therefore,$GA$ is helpful in the elongation of plants.