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Behaviors Governed by circadian & Circannual rhythm

Published byLauren Hill Modified over 6 years ago

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Presentation on theme: "Behaviors Governed by circadian & Circannual rhythm"— Presentation transcript:

1 Behaviors Governed by circadian & Circannual rhythm
Chapter 39 & 49 Behaviors Governed by circadian & Circannual rhythm

2 Circadian Rhythm Physiological cycle that displays an endogenous, entrainable oscillation of about 24 hours. © 2011 Pearson Education, Inc.

3 Suprachiasmatic Nucleus (SCN)
© 2011 Pearson Education, Inc.

4 Deviation From 24-Hour Clock
Mouse Actogram Model © 2011 Pearson Education, Inc.

5 Photoreceptors in Plants
Blue-light photoreceptors Stomatal opening Phytochromes Sleep movements Seed germination © 2011 Pearson Education, Inc.

6 Plant Response to Seasons
Photoperiod Relative lengths of night and day Photoperiodism  physiological response Short-day Flower when night > day Long-day Flower when night < day Day-neutral Flowering controlled by plant maturity, not photoperiod © 2011 Pearson Education, Inc.

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