In your warm house, poinsettias act as short-day plants that turn red when the daylength is less than 12 hours. If you want to get a poinsettia ready for Christmas, which of the following would work best?

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    Give it continuous light.
    Give it continuous darkness.
    Keep it in the dark, but shine a light on it for an hour every 13 hours.
    Keep it in the light except for turning off the light once a day for 1 hour.
    None of these would get it to turn red.

asked May 30, 2013 in Biology by anonymous
    

1 Answer

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Keep it in the light except for turning off the light once a day for 1 hour.
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)

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