As a seed germinates,its shoot points upward toward light,and its roots grow downward into the soil.Turn the plant sideways,and the stem and roots bend according to the new direction of gravity.How do roots and shoots grow in opposite directions as the plant is rotated?

Question

Quizplus · Accepted Answer

The roots and shoots respond oppositely to auxin, a plant hormone that plays a key role in regulating plant growth and development. In response to gravity, auxin accumulates on the lower side of the stem, which stimulates growth on that side, causing the stem to bend and grow upward. In roots, however, auxin accumulates on the upper side in response to gravity, inhibiting growth and causing the root to grow downward. Therefore, when the plant is rotated, the direction of auxin accumulation is also changed, leading to opposite growth directions in roots and shoots.

As a Seed Germinates,its Shoot Points Upward Toward Light,and Its