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

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About This Chapter

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

Why are plants so sensitive to environmental changes? In this lesson, we explore signal transduction in plants and see how this helps plants adapt to the world around them.
Plant Hormones: Chemical Control of Growth and Reproduction

2. Plant Hormones: Chemical Control of Growth and Reproduction

We most often think of hormones as things that control our actions and development. However, even plants have these chemicals to help regulate growth and reproduction.
Gibberellins in Plants: Definition & Function

3. Gibberellins in Plants: Definition & Function

Plants have hormones just like humans. Many plant hormones regulate growth and development. In this lesson, we will learn about hormones known as Gibberellins.
Abscisic Acid in Plants: Definition & Function

4. Abscisic Acid in Plants: Definition & Function

A hormone is a substance produced by an organism that stimulates a process or response. In this lesson, we will examine the plant hormone known as abscisic acid.
Plant Photoreceptors: Definition, Types & Function

5. Plant Photoreceptors: Definition, Types & Function

Can plants tell time? How do they know when it's sunny out? Photoreceptors are specialized cells that communicate this information to plants, which in turn helps them know when to make energy from sunlight as well as when and how to grow.
What Is Phototropism? - Definition, Experiments & Examples

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

Why do plants bend toward sunlight? Phototropism is one way a plant can maximize its exposure to sunlight, and because plants need sunlight to make food, this is an important survival tactic.
Photoperiodicity: Short-day, Long-day and Day-Neutral Plants

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

Ever wonder why some plants will bloom in the spring but others in the summer? The length of daylight can influence when a flower will bloom. We will look at how the amount of sunlight regulates when plants produce flowers.
Tropisms: Phototropic, Geotropic and Thigmotropic Plant Growth

8. Tropisms: Phototropic, Geotropic and Thigmotropic Plant Growth

Animals aren't the only things that can respond to the environment. While plants may seem inanimate at times, they, too, can respond to the environment in order to better survive.
How Plants Respond to Gravity

9. How Plants Respond to Gravity

Plants respond to a wide variety of stimuli. This includes gravity. This lesson explains how gravity influences a plant, especially in its earliest stages of development.
Plant Responses to Mechanical Stimuli

10. Plant Responses to Mechanical Stimuli

Did you know that animals are not the only living things able to respond to touch? Plants have a sense of touch. Actually, plants respond to all sort of mechanical stimuli, as this lesson explains.
Environmental Stimuli & Stress: Plant Adaptations & Responses

11. Environmental Stimuli & Stress: Plant Adaptations & Responses

Plants get stressed out about a lot of stuff, like floods, droughts, high heat, and cold. And they have ways in which they deal with these kinds of stress. This lesson gives some examples of how this occurs.
How Plants Defend Against Pathogens & Herbivores

12. How Plants Defend Against Pathogens & Herbivores

We have many ways by which to defend ourselves against enemies. Plants also have quite a few ways in which they fight off herbivores and pathogens, some of which this lesson discusses.
Chapter Practice Exam
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Practice Final Exam
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