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For more information, please see full course syllabus of Life Science
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Plant Responses

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Objectives 0:07
    • Objectives
  • What are Plant Responses? 0:24
    • Behavior
    • Stimulus: External and Internal
  • Tropisms 2:40
    • Tropisms
    • Positive Examples
  • Plant Hormones 5:07
    • Plant Hormones
    • Ethylene
    • Auxin
    • Gibberellins
    • Cytokinins
    • Abscicic Acid
  • Photoperiods 10:12
    • Photoperiods
    • Long-day Plants
    • Short-day Plants
    • Day-neutral Plants
    • Diagram: Short-day and Long-day Plants
  • Example 1: Which Plant Hormone Helps Fruit to Ripen? 13:21
  • Example 2: Which Plant Hormone Keeps Buds from Developing During the Winter? 14:02
  • Example 3: List One Example of an Internal and External Stimulus in Plants 14:52
  • Example 4: Describe What Happened to the Plants in the Picture 15:27