Cell Wall
The cell wall is a rigid, structural layer that surrounds the cell membrane of plant cells, fungi, and some bacteria. It provides support and protection for the cell, helping it maintain its shape and resist mechanical stress.
Composition
The cell wall is primarily composed of cellulose in plant cells, chitin in fungi, and peptidoglycan in bacteria. These materials provide strength and rigidity to the cell wall.
Functions
- Support: The cell wall provides structural support for the cell, preventing it from collapsing under its own weight.
- Protection: It acts as a barrier, protecting the cell from physical damage and pathogens.
- Regulation: The cell wall regulates the movement of substances in and out of the cell, helping to maintain internal pressure and osmotic balance.
Comparison with Cell Membrane
The cell wall differs from the cell membrane, which is a flexible, semi-permeable barrier that surrounds all types of cells. While the cell membrane controls the movement of substances into and out of the cell, the cell wall provides structural support and protection.
Study Tips
- Identify the differences between the cell wall and cell membrane.
- Learn the composition of the cell wall in plant cells, fungi, and bacteria.
- Understand the functions of the cell wall in maintaining cell shape and resisting mechanical stress.
- Explore the impact of the cell wall on the growth and development of plant cells.
- Compare and contrast the cell wall in different types of organisms.
[Cell Wall] Related Worksheets and Study Guides:
.◂Science Worksheets and Study Guides Third Grade. Relationships among living things
Study Guide
Relationships among living things 
Activity Lesson
Relationships Among Living Things Worksheet/Answer key
Relationships among living things Worksheet/Answer key
Relationships among living things Worksheet/Answer key
Relationships among living things Worksheet/Answer key
Relationships among living things Vocabulary/Answer key
Relationships among living things Vocabulary/Answer key
Relationships among living things
Activity LessonWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyVocabulary/Answer keyVocabulary/Answer keyThe resources above cover the following skills:
LIFE SCIENCE
From Molecules to Organisms: Structures and Processes
Create representations to explain the unique and diverse life cycles of organisms other than humans (e.g., flowering plants, frogs, butterflies), including commonalities such as birth, growth, reproduction, and death.
Unity and Diversity
Construct an argument from evidence to explain the likelihood of an organism’s ability to survive when compared to the resources in a certain habitat (e.g., freshwater organisms survive well, less well, or not at all in saltwater; desert organisms survive well, less well, or not at all in woodlands).
Create models that illustrate how organisms and their habitats make up a system in which the parts depend on each other.