Phototropism | Plant Biology | Khan Academy | Summary and Q&A

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September 12, 2016
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Phototropism | Plant Biology | Khan Academy

TL;DR

Plants exhibit phototropism, where they turn and grow towards light, and this is controlled by a hormone called auxin.

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Questions & Answers

Q: What is phototropism?

Phototropism is the phenomenon where plants turn or grow towards or away from light.

Q: What is auxin?

Auxin is a plant hormone that plays a crucial role in controlling plant growth and development, including phototropism.

Q: How does auxin cause plants to bend towards light?

Auxin acts by increasing the concentration of active auxin on the side of the plant away from the light, causing cells on that side to elongate and bend the plant towards the light source.

Q: What is positive and negative phototropism?

Positive phototropism occurs when plants turn or grow towards the light, while negative phototropism is when plants move away from the light.

Summary & Key Takeaways

  • Plants exhibit tropism, where they change direction due to external stimuli, such as light.

  • Phototropism is the specific term for plants turning or growing in response to light.

  • Auxin, a plant hormone, is responsible for controlling the growth and direction of plants in response to light.

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