Shoots that grow vertically toward the sun can be characterized as positive for phototropism and negative for gravitropism.
- An organism's growth in response to a light stimulation is known as phototropism.
- Although fungus and other species such as plants can exhibit phototropism, plants are where it is most frequently seen.
- A hormone called auxin is present in the plant cells that are farthest from the light and responds to phototropism.
- Shoots and roots are directed higher and downward by the key plant development response known as gravitropism, allowing each organ to reach surroundings that are suitable for carrying out its basic duties.
- Roots often bend away from light (i.e., exhibit negative phototropism) in the direction of gravity, whereas stem-like organs drive their growth toward light (i.e., positive phototropism) and away from gravity (i.e., negative gravitropism) (i.e. positive gravitropism).
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