EVERYDAY SCIENCE

Detailed explanation-1: -Promotes Tropism: Auxin induces phototropism, gravitropism and thigmotropism, i.e. movement in response to light, gravity and touch, respectively.

Detailed explanation-2: -Auxins also play a part in phototropism, an occurrence that involves plants bending or moving away from light. The shoot tip is responsible for directional movement by the plant in response to sunlight, as this is the area where auxins can be found.

Detailed explanation-3: -Auxin. Auxin causes several responses in plants: Bending toward a light source (phototropism). Downward root growth in response to gravity (geotropism).

Detailed explanation-4: -Auxins control the growth of plants by promoting cell division and causing elongation in plant cells (the cells get longer). Stems and roots respond differently to high concentrations of auxins: cells in stems grow more.

Detailed explanation-5: -… auxin distributions are responsible for phototropic responses-i.e., the growth of plant parts such as shoot tips and leaves toward light. In certain cases auxin may be destroyed on the illuminated side, and the unilluminated side with more auxin elongates, causing the shoot to bend toward the light.