Unit 25: Life Cycles and Basic Biology

Day 4 of 30

Cells: basic unit of life

3-5Science

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Learning Objective

Students will be able to explore cells and basic unit of life.

Today's Lesson

In this lesson, we'll explore cells: basic unit of life. Scientific inquiry allows us to investigate and explain natural phenomena.

A cell is the smallest unit of life—the basic building block of all living things. Some organisms, like bacteria, are made of just one cell. Others, like humans, are made of trillions of cells! Each cell has parts that do different jobs: the nucleus controls the cell, the cell membrane holds it together, and other parts help with energy and growth. Think of cells as tiny factories that keep life going!

As you work through today's material, pay attention to the examples and try to identify the patterns or strategies being used. This will help you apply these concepts to new problems.

Take notes on key points and make connections to what you've already learned in previous lessons.

Key Terms
Investigate

To examine systematically through observation and experiment

Evidence

Observable facts that support or refute a claim

Activities
Instructions
1. Read the background information on cells: basic unit of life. 2. Form a hypothesis before beginning. 3. Conduct the investigation following procedures. 4. Record observations and analyze results.
Materials Needed
  • Lab notebook
  • Investigation materials
  • Safety equipment if needed
Practice Problems
1

What is the basic unit of life?

Hint: It starts with "c" and is very small.
2

Name three parts found in most cells.

Hint: Think about the control center, outer layer, and jelly-like filling.
3

How is a plant cell different from an animal cell?

Hint: Think about cell walls and chloroplasts.

Teaching Tip

For this age group: Balance direct instruction with collaborative activities. Allow students to explain their thinking and make connections to prior knowledge when exploring cells: basic unit of life.

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