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    1.  What is photperiodism?

    The response of a plant to the amount lengths of light and dark it gets
    The amount of photo's you take in a period of time.


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    2.  How do Birds use Photoperiodism?


    Migration
    for food


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    3.  How is photoperiodism in plants classified?

    long day plants, short day plants, or neutral day plants.
    Big plants, small plants, medium plants


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    4.  With the beginning of a light period begins what stage?

    photophilic stage
    darkness loving stage


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    5. What do plants use to sense the seasonal changes in the length of a day?


    pigment phytochrome
    physiologically


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