Describe briefly biological effects of light on animals reproduction
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The importance of light to organisms is due to two factors. It is employed as a cue in both plants and animals for the timing of daily and seasonal rhythms, and it is also used to aid plant growth.
Most species only breed for a portion of the year, therefore a dependable cue is required to initiate breeding behaviour. The length of the day is a good cue because it gives a fully predictable changing pattern throughout the year.
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