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Ch 39: Campbell Biology Chapter 39: Plant Responses to Internal and External Signals

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The Plant Responses to Internal and External Signals chapter of this Campbell Biology Companion Course helps students learn the essential lessons associated with plant responses to signals. Each of these simple and fun video lessons is about five minutes long and is sequenced to align with the Plant Responses to Internal and External Signals textbook chapter.

How It Works:

  • Identify the lessons in the Campbell Biology Plant Responses to Internal and External Signals chapter with which you need help.
  • Find the corresponding video lessons with this companion course chapter.
  • Watch fun videos that cover the plant responses topics you need to learn or review.
  • Complete the quizzes to test your understanding.
  • If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.

Students will learn:

  • What signal transduction is
  • Kinds of plant hormones and their functions
  • Types of plant photoreceptors
  • The definition for phototropism
  • Categories of photoperiodic plants
  • Types of tropisms
  • Different stimuli that plants respond to
  • Kinds of plant defenses

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12 Lessons in Chapter 39: Campbell Biology Chapter 39: Plant Responses to Internal and External Signals
Chapter Practice Test
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Signal Transduction in Plants: From Reception to Response

1. Signal Transduction in Plants: From Reception to Response

Changes in cellular activity induced by external signals are called signal transductions. Discover the signal pathways from reception to response and the popular plant signal transduction.
Plant Hormones: Chemical Control of Growth and Reproduction

2. Plant Hormones: Chemical Control of Growth and Reproduction

Like in humans, plants have hormones that are chemical receptors that control growth and reproduction. Learn about the function of hormones and the four different types of hormones found in plants.
Gibberellins in Plants: Definition & Function

3. Gibberellins in Plants: Definition & Function

Gibberellins are plant hormones that promote and regulate growth. Learn how to define gibberellins, explore their function, and discover their uses in farming and florist's shops.
Abscisic Acid in Plants: Definition & Function

4. Abscisic Acid in Plants: Definition & Function

Abscisic acid (ABA) is a plant hormone that regulates numerous aspects of plant growth, development, and stress responses. Study the definition and function of abscisic acid in this lesson.
Plant Photoreceptors: Definition, Types & Function

5. Plant Photoreceptors: Definition, Types & Function

The photoreceptors of plants perceive light and regulate biological activities within plants. Learn more about the definition of plant photoreceptors, the two different types of photoreceptors, and their specific functions.
What Is Phototropism? - Definition, Experiments & Examples

6. What Is Phototropism? - Definition, Experiments & Examples

Phototropism refers to plant growth in the direction of a light source. Explore the definition of phototropism, results of early experiments, and examples of the two types: negative and positive phototropism.
Photoperiodicity: Short-day, Long-day and Day-Neutral Plants

7. Photoperiodicity: Short-day, Long-day and Day-Neutral Plants

Photoperiodism is an organism's response to the length of the day vs the length of the night. The length of daylight can affect the growth of a plant. Discover how plants are classified into short-day, long-day, and day-neutral plants based upon their exposure to daylight in this lesson.
Tropisms: Phototropic, Geotropic and Thigmotropic Plant Growth

8. Tropisms: Phototropic, Geotropic and Thigmotropic Plant Growth

Explore the key types of tropisms that allow plants to respond to their environment. Learn to define tropism and explore phototropic, geotropic, and thigmotropic plant growth.
How Plants Respond to Gravity

9. How Plants Respond to Gravity

Plants respond to gravity by growing towards or away from the earth, partially influenced by biochemical signals. Learn about plant stimuli, gravitropism (or geotropism), and statoliths.
Plant Responses to Mechanical Stimuli

10. Plant Responses to Mechanical Stimuli

Although less noticeable than most animals, plants respond to mechanical stimuli as well. Learn three types of responses of plants to mechanical stimuli: thigmomorphogenesis, thigmotropism, and thigmonasty.
Environmental Stimuli & Stress: Plant Adaptations & Responses

11. Environmental Stimuli & Stress: Plant Adaptations & Responses

Discover the variety of abiotic stresses, also known as environmental stresses, that can affect plants, such as floods, droughts, heat, and cold. Finally, learn how plants combat these stresses, including using heat-shock proteins.
How Plants Defend Against Pathogens & Herbivores

12. How Plants Defend Against Pathogens & Herbivores

Plants have defense mechanisms that activate when they are threatened by herbivores or infected by pathogens. Learn about different attacks on plants, their defense mechanisms against herbivores, and their defense mechanisms against pathogens.
Chapter Practice Exam
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Practice Final Exam
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