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Effect of Light on Plants
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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
What is the word to describe a plant that has grown without light?
Etiolated
If the light source is from one side, then the plant grows towards the light. This is called...?
Positive phototropism
What is a photoperiod?
The length of the day (period of illumination)
The response shown by plants to changes in the photoperiod is called...?
photoperiodism
Where in the plant is this light stimulus detected?
In the leaves
What are the three types of plants?
Long day plants
Short day plants
Day-neutral plants
When do long day plants flower?
When the period of illumination exceeds a critical minimum length
When do short day plants flower?
When the period of illumination is less than a critical maximum length
What effect does photoperiod have on day-neutral plants?
It has no effect
Where do long day plants tend to live and when do they flower?
Nearer the poles
Flower in the summer
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)
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
Author
Anonymous
ID
147542
Card Set
Effect of Light on Plants
Description
Higher Biology - Unit Three - Effect of Light on Plants
Updated
4/14/2012, 8:55:48 AM
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