BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Apical dominance means that the growing apex of a plant controls the quiescence of buds sitting in lower positions along a shoot. This kind of bud inhibition is termed ‘correlative inhibition’.

Detailed explanation-2: -In most higher plants, the growing apical bud inhibits the growth of the lateral (axillary) buds, a phenomenon called apical dominance. Removal of shoot tips (decapitation) usually results in the growth of lateral buds (Figure 15.11).

Detailed explanation-3: -Apical dominance is a phenomenon in which central stem is dominant and growth of lateral buds is inhibited. It is due to plant hormones produced in the tip of the shoot. Auxin hormone is responsible for apical dominance and cytokinin hormone is responsible for breaking the apical dominance.

Detailed explanation-4: -The direct theory explains apical dominance as auxin synthesized in the shoot apex moves down the stem into buds and inhibits their growth. According to this theory, apically derived auxin inhibits buds from synthesizing their own auxin necessary for their growth.