Photoperiodism
Beginning of paper
Plants and animals in the temperate zones respond in different ways to
the amount of daylight in 24-hour periods. This response to day length is
called photo periodism. It controls many activities, among them is the
flowering of plants. The ability to respond to day length is linked to an
inner, l ....
Middle of paper
.... in the duration of light, plants can measure day length to
determine the season and the time spans within a season. Florists can
often manipulate greenhouse plants into producing blossoms out of season
by exposing them to periods of artificial light.
Some scientists are not certain that the biological clock of any
organism is completely endogenous. They think that even under the most
constant of laboratory conditions living things are aware of the Earth's
rotation and that this has an ....
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Word count: 260
Page count: 1 (approximately 250 words per page)
