1) Phototropism: Plant hormones such as auxin regulate the growth and bending of plant stems towards a light source. Phototropism allows plants to maximize their exposure to sunlight for photosynthesis.
2) Apical dominance: Plant hormones, particularly auxin, are responsible for regulating the growth of lateral buds. The presence of auxin in the terminal bud inhibits the growth of nearby lateral buds, ensuring the upward growth of the plant.
3) Leaf senescence: Plant hormones such as ethylene regulate the process of leaf senescence, which is the natural aging and death of leaves. Ethylene promotes the breakdown of chlorophyll and other leaf pigments, leading to the yellowing and eventual shedding of the leaves.
Give examples of any three physiological processes that
are regulated by plant hormones
1 answer