Describe the distribution of auxin in the shoot. Explain how it affects the growth of the shoot. Explain what happens to the distribution of auxin in the shoot when light falls on... Describe the distribution of auxin in the shoot. Explain how it affects the growth of the shoot. Explain what happens to the distribution of auxin in the shoot when light falls on it from one direction. Explain how the distribution of auxin affects the growth of the shoot. Explain what happens in the shoot when light falls evenly on it again.
Understand the Problem
The question is asking about the concept of phototropism in plants, specifically how light affects the distribution of auxin and the growth patterns of a plant shoot. It seeks explanations for the effects of light on both even and uneven distribution of auxin within the shoot.
Answer
Auxin causes plants to grow towards light by moving to the shaded side, creating uneven growth. When light is uniform, growth equalizes.
Auxin is evenly distributed in the shoot under uniform light, promoting equal growth on all sides. When light falls from one direction, auxin accumulates on the shaded side, causing the shoot to bend towards the light due to faster elongation of cells on that side. When light is even again, the distribution normalizes, and the shoot straightens as growth equalizes.
Answer for screen readers
Auxin is evenly distributed in the shoot under uniform light, promoting equal growth on all sides. When light falls from one direction, auxin accumulates on the shaded side, causing the shoot to bend towards the light due to faster elongation of cells on that side. When light is even again, the distribution normalizes, and the shoot straightens as growth equalizes.
More Information
Auxin is a plant hormone that regulates growth. Its uneven distribution due to directional light causes phototropism, the growth of plants towards light.
Tips
A common mistake is thinking auxin moves towards light. Instead, it accumulates on the shaded side.
Sources
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