NEET BIOLOGY

Detailed explanation-1: -The term auxin is derived from the Greek word auxein, which means “to grow. ” Auxins are the main hormones responsible for cell elongation in phototropism and gravitropism.

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: -The five groups of plant growth regulators used in fruit crops include: Auxins: These are growth promoting substances that contribute to the elongation of shoots, but at high concentrations they can inhibit growth of lateral buds.

Detailed explanation-4: -Phototropisms. In a stem, the shaded side contains more auxin and grows longer, which causes the stem to grow towards the light. The plant does NOT bend towards the light. It grows because the auxin causes the cells to elongate on the shaded side, so this side grows more.

Detailed explanation-5: -They found that a plant hormone called auxin helps control the direction of a plant’s growth in response to environmental stimuli. Auxin is made in the meristematic regions of the plant including the very tips of stems and roots.