🔬 Part 1: Multiple Choice

1. Which of the following is a unicellular organism?

Human

Bacteria

Oak tree

Dog

2. What is the main difference between unicellular and multicellular organisms?

Unicellular organisms are bigger

Unicellular organisms are made of one cell, multicellular organisms are made of many cells

Multicellular organisms don't have cells

There is no difference

3. Which life functions do ALL cells perform? (Check all that apply)

Getting energy from food

Growing and reproducing

Responding to their environment

Flying

4. In multicellular organisms, cells work together by:

Competing with each other

Specializing in different jobs

Working alone

Staying separate from other cells

✏️ Part 2: Short Answer Questions

5. Explain how cells in your body work as a team. Give one example.

6. Fill in the blanks:

A _________________ organism is made of only one cell, while a _________________ organism is made of many cells working together. An example of a unicellular organism is _________________.

7. Why do you think multicellular organisms need their cells to specialize (have different jobs)?

8. List three life functions that both unicellular and multicellular organisms must perform to survive:

1. _________________________________

2. _________________________________

3. _________________________________

🔍 Part 3: Compare and Contrast Activity

9. Complete the comparison chart below by writing characteristics of unicellular and multicellular organisms:

UNICELLULAR ORGANISMS

MULTICELLULAR ORGANISMS

10. Choose ONE unicellular organism and ONE multicellular organism. Explain how each one performs the life function of getting energy:

📖 Part 4: Reading Comprehension

Cells are the basic building blocks of all living organisms. They perform essential functions that are necessary for life, such as obtaining energy, growing, and reproducing. Unicellular organisms, like bacteria, consist of a single cell that carries out all these functions independently. In contrast, multicellular organisms, such as humans, are made up of many cells that work together, each specializing in different tasks to support the organism as a whole.

11. What is the main function of cells according to the passage?

12. How do unicellular organisms differ from multicellular organisms based on the passage?

13. Why is it important for cells in multicellular organisms to specialize?