HORTICULTURE

Detailed explanation-1: -More auxin is transported down the shady side, and less auxin is transported down the illuminated side. Auxin promotes cell elongation, causing the plant to grow more on the shady side and bend in the direction of the light source.

Detailed explanation-2: -The higher concentration of auxin in the shaded side of the plant stem causes these cells grow longer, bending the plant toward the sun. Therefore auxins are also responsible for affecting phototropism, the process which allows the plant to follow the sun.

Detailed explanation-3: -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-4: -Auxin is in the same concentration on both sides of the shoots, so they grow evenly and longer on both sides.

Detailed explanation-5: -But when sunlight varies, auxin is broken down on the sunnier side of the stem. The higher concentration of auxin on the shady side causes the plant cells on that side to grow more so it bends toward the light.