Textbook Notes (367,976)
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BI111 (118)
Chapter 31

Chapter 31 Textbook Notes.docx

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Department
Biology
Course
BI111
Professor
Tristan Long
Semester
Winter

Description
Chapter31TextbookNotes04222012Define HormoneA signaling molecule that regulates or helps coordinate some aspect of plants growth metabolism or developmentSenescenceAging of living organismsDormancyWhen a perennial or biennial plant stops growing under conditions that seem quite suitable for growthPhotoperiodismCircadian rhythm Regulated by a biological clock Internal timemeasuring mechanisms with biochemical basis and are 24 hour cyclesThigmotropismRepsonses to physical contact Example a vine wrapping around a poleNastic movements Reversible responses to nondirectonal stimulimovements in leaves leaflets and flowersExample Sensitive plant Mimosa pudicaMechanical stimulation triggers a membrane action potential water then enters or exits cells triggering leaf foldingPhototropism Responses to light blue light receptors trigger auxin transportGravitropism
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