BIOMOLECULES AND ENZYMES

Detailed explanation-1: -The apical bud produces a plant hormone, auxin, (IAA) that inhibits growth of the lateral buds further down on the stem towards the axillary bud.

Detailed explanation-2: -Final answer: Indole-3-acetic acid (IAA) is responsible for apical dominance in plants.

Detailed explanation-3: -Auxins are plant hormones. Auxin stimulates plant cells to elongate, and the apical meristem of a plant is one of the main areas that auxin is produced. It inhibits the growth of lateral buds and promotes the growth of terminal buds. Hence, increasing the length of the plant.

Detailed explanation-4: -It is commonly accepted that the plant hormone auxin mediates apical dominance.

Detailed explanation-5: -Auxin causes apical dominance and gibberellin causes internodal elongation. Cytokinin promotes the growth of lateral buds by suppressing the growth of apical bud.