Podcast
Questions and Answers
Auxin promotes ______ by influencing cell elongation in response to light direction.
Auxin promotes ______ by influencing cell elongation in response to light direction.
phototropism
In response to light, auxin redistributes to the ______ side of the plant.
In response to light, auxin redistributes to the ______ side of the plant.
shaded
The higher concentration of auxin on the shaded side stimulates cell ______.
The higher concentration of auxin on the shaded side stimulates cell ______.
elongation
Auxin transport proteins like ______ mediate the asymmetrical distribution of auxin.
Auxin transport proteins like ______ mediate the asymmetrical distribution of auxin.
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As the shaded cells elongate more, the plant bends towards the ______ source.
As the shaded cells elongate more, the plant bends towards the ______ source.
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Study Notes
Phototropism Mechanism
- Phototropins, light-sensitive proteins, detect light direction in plant cells.
- Auxin, a plant hormone, redistributes to the shaded side of the plant in response to light.
- This redistribution is facilitated by auxin transport proteins such as PIN proteins.
- The higher auxin concentration on the shaded side stimulates cell elongation.
- Auxin activates proton pumps, decreasing the pH in the cell wall.
- This acidification activates enzymes like expansins, loosening the cell wall structure.
- This process allows cells to absorb water and expand.
- As shaded side cells elongate more, the plant bends towards the light source.
- This response optimizes light exposure for photosynthesis.
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Description
Explore the fascinating mechanism of phototropism in plants, where light-sensitive proteins called phototropins detect the direction of light. Learn how the plant hormone auxin influences cell elongation and growth towards light, optimizing photosynthesis.
