Which of the following plant hormones regulates growth, particularly by stimulating cell elongation in stems?

Auxin

The correct answer is Option (4) -Auxin

The correct answer is Auxin.

Explanation:

• Auxin is a plant hormone that plays a crucial role in regulating plant growth and development.
• One of its primary functions is to stimulate cell elongation, particularly in stems. This means that auxin promotes the lengthening of plant cells, leading to the elongation of stems.
• Auxin is synthesized primarily in the apical meristem of shoot tips and then transported downwards through the stem.
• Other functions of auxin include promoting root development, maintaining apical dominance, and stimulating the formation of adventitious roots.