(N/A) Auxins are a group of plant hormones that play a crucial role in plant growth and development. Their effects in different parts of a plant are as follows:
$1$. Auxin is synthesized in the apical meristems of both the shoot and the root.
$2$. In the shoot,auxin promotes cell enlargement,which contributes to the elongation of the stem.
$3$. Auxin is responsible for apical dominance,where it inhibits the development of lateral buds,ensuring the plant grows primarily in height.
$4$. Auxin also promotes cell division in certain tissues,facilitating overall plant growth.
[Diagram Description: The diagram shows a plant with labels indicating that auxin is formed in the apical meristems of the shoot and root,promotes cell enlargement and cell division,and inhibits the development of lateral buds.]