Gibberellins are primarily known for regulating which aspect of plant growth?

Gibberellins are primarily known for regulating which aspect of plant growth?

• A. Flowering timing
• B. Height and stem elongation
• C. Leaf senescence
• D. Root hair formation

Answer: (D)

Gibberellins are growth-promoting hormones that mainly boost stem elongation by stimulating cell expansion and division in the internodes. This is why plants with higher gibberellin activity tend to grow taller, and why applying gibberellins can cause stems to lengthen or trigger rapid bolting in some crops. While gibberellins can influence flowering time or seed germination in certain species, the most distinctive and widely recognized effect is increased height and stem elongation. Root hair formation is more strongly influenced by other signals like auxins, and leaf senescence is regulated largely by ethylene and cytokinins. So the aspect most associated with gibberellins is height and stem elongation.

Gibberellins are growth-promoting hormones that mainly boost stem elongation by stimulating cell expansion and division in the internodes. This is why plants with higher gibberellin activity tend to grow taller, and why applying gibberellins can cause stems to lengthen or trigger rapid bolting in some crops. While gibberellins can influence flowering time or seed germination in certain species, the most distinctive and widely recognized effect is increased height and stem elongation. Root hair formation is more strongly influenced by other signals like auxins, and leaf senescence is regulated largely by ethylene and cytokinins. So the aspect most associated with gibberellins is height and stem elongation.