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.
As the shaded cells elongate more, the plant bends towards the ______ source.
As the shaded cells elongate more, the plant bends towards the ______ source.
Flashcards
Auxin
Auxin
A plant hormone that plays a crucial role in phototropism, the growth of a plant in response to light.
Phototropins
Phototropins
Proteins found in plant cells that sense the direction of light, initiating the phototropic response.
Auxin Redistribution
Auxin Redistribution
The uneven distribution of auxin on the shaded side of a plant, causing cells to elongate more than those on the illuminated side.
Expansins
Expansins
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Phototropism
Phototropism
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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.
