Differentiate between circadian rhythms and photoperiodism. Give examples of each. What regulates ...

Answer to q. 1

Concepts to Consider: Photoperiodism is any response to changing lengths of day and
night; responses are tied to phytochrome, resulting in influences on timing of flowering, seed
germination, leaf abscission and shade avoidance; circadian rhythms are those based on a 24 hour cycle and may be cued to phytochromes as well as cryptochormes, influencing sleep
movements, stomatal opening and closing, and opening and closing of flowers

Answer to q. 2

See Figure 38-5 in textbook for details.
Answer should include the following points:Coleoptiles
uncovered: bend towards light rays
Coleoptile tips covered: no bending
Coleoptile tips removed: no bending
Coleoptiles covered everywhere but tip: tip bends toward light rays

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