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Questions and Answers
What is phototropism in plants?
What is phototropism in plants?
- The phenomenon where plants grow towards light. (correct)
- The process of plants growing away from gravity.
- The method by which plants lose water.
- The reaction of plants to temperature changes.
Which hormone is responsible for stimulating cell elongation in phototropism?
Which hormone is responsible for stimulating cell elongation in phototropism?
- Auxin (correct)
- Gibberellin
- Cytokinin
- Ethylene
What causes a plant to bend towards light during phototropism?
What causes a plant to bend towards light during phototropism?
- Unequal distribution of roots in the soil.
- The weight of the flowers causing lateral growth.
- Higher temperatures on the light side.
- Differential growth rates on the sides of the stem. (correct)
What role does light play in phototropism?
What role does light play in phototropism?
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When can the stimulus for phototropism occur?
When can the stimulus for phototropism occur?
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Study Notes
Phototropism
- Plants grow towards light, this is called phototropism
- The plant hormone auxin is produced in the growing tip of the stem
- Auxin stimulates cell elongation on the darker side of the stem
- This causes the stem to bend towards the light
- Plants use phototropism to maximise their exposure to sunlight for photosynthesis
- Phototropism is a response to light stimuli
- Light stimuli can be diurnal, seasonal, or disease related
- Auxin plays a key role in phototropism
- Plants use phototropism to maximize light capture for photosynthesis
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