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Anonymous
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What do plants that have grown without light look like?
- They are tall and spindly
- They have small, curled, yellow leaves and long internodes
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What is the word to describe a plant that has grown without light?
Etiolated
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If the light source is from one side, then the plant grows towards the light. This is called...?
Positive phototropism
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What is a photoperiod?
The length of the day (period of illumination)
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The response shown by plants to changes in the photoperiod is called...?
photoperiodism
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Where in the plant is this light stimulus detected?
In the leaves
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What are the three types of plants?
- Long day plants
- Short day plants
- Day-neutral plants
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When do long day plants flower?
When the period of illumination exceeds a critical minimum length
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When do short day plants flower?
When the period of illumination is less than a critical maximum length
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What effect does photoperiod have on day-neutral plants?
It has no effect
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Where do long day plants tend to live and when do they flower?
- Nearer the poles
- Flower in the summer
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Where do short day plants tend to live and when do they flower?
- Near the equator
- Flower all year long (or in temperate regions start of spring or end of autumn)
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What is the biological significance of light triggering when plants flower?
- All members of a species produce flowers at the same time of year
- Cross-pollination can occur on a large scale which increases variation amongst offspring
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