Photoperiodism
Wikipedia.org
In plants
Many flowering plants use a photoreceptor protein, such as phytochrome or cryptochrome, to sense seasonal changes in night length, or photoperiod, which t READ MORE http://en.wikipedia.org/wiki/Photoperiodism
Grain of Pollen
The Visual Dictionary
Grain of pollen: microscopic part produced by the anther that serves as the male agent of fertilization in flowering plants.
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Sexual Reproduction in Angiosperms
Profession John W. Kimball, retired
Angiosperms are the flowering plants (today the most abundant and diverse plants on earth).
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