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4th Grade Science
Sensing and Response
4. Plant Responses
Environmental Response, Reactions to light, touch, gravity
How Plants React to Light, Touch, and Gravity
You will discover how plants grow and respond to the world around them using amazing survival strategies called tropisms.
What You'll Learn
You will learn that tropisms are plant growth responses to environmental stimuli.
You can identify phototropism, gravitropism, thigmotropism, and hydrotropism types.
You will discover that positive tropisms grow toward and negative away from stimuli.
You will understand how auxin hormone causes plant stems to bend toward light.
What You'll Practice
1
You will identify different tropism types using real plant behavior examples.
2
You will match vocabulary terms like stimulus, tropism, and auxin correctly.
3
You will explain why roots grow down and stems grow up using gravitropism.
Why This Matters
Understanding how plants respond to light, gravity, and touch helps you explain why living things grow and survive the way they do in their environment.
This Unit Includes
1 Video lesson
Practice exercises
Learning resources
Skills
Tropism
Phototropism
Gravitropism
Thigmotropism
Plant Responses
