Grade 8 · Science · Unit 8 of 22
Cells, Organisms & Technology
One cell or many, and the tools that reveal them
What your child practises
How microscopes and newer technologies such as stem cell research and gene editing have changed our understanding of cells, how single-celled and many-celled organisms meet their needs, and the benefits and concerns of cell biology developments.
Alberta Curriculum learning outcome: Unit B: Cells and Systems · cells, tissues and organisms
Sample questions
A taste of this unit. In the app, questions change every time and get easier or harder to match your child.
Question 1
Is each organism unicellular or multicellular?
Sort into: ⚪ Unicellular · 🧬 Multicellular
- 🐦chickadee
- 🦠amoeba
- 🌳oak tree
- 💧paramecium
- 🍞yeast
- 🔬bacterium
- 🍄mushroom
- 🐟trout
Show answer
⚪ Unicellular: amoeba, paramecium, yeast, bacterium · 🧬 Multicellular: chickadee, oak tree, mushroom, trout
Hint: Bacteria, amoebas, paramecia and yeast are single cells. Plants, fish and mushrooms are made of many cells.
Question 2
Order these from smallest to largest.
- 🧠Organ system
- 🧫Tissue
- 🧍Organism
- 🫀Organ
Show answer
Tissue → Organ → Organ system → Organism
Hint: Cells form tissues, tissues form organs, organs form organ systems, and systems make up an organism.
Question 3
Which statement completes the cell theory? Cells are the basic unit of life, and…
- all cells have a cell wall
- all cells come from other cells
- all cells are visible without a microscope
- all cells are the same size
Show answer
all cells come from other cells
Hint: New cells are made when existing cells divide.
Question 4
The order from smallest to largest is cell, tissue, organ and then…
- atom
- molecule
- organelle
- organ system
Show answer
organ system
Hint: Organ systems, such as the digestive system, work together in an organism.
Question 5
Under a microscope, the field of view is 1250 µm wide and 5 identical cells fit across it in a row. How wide is one cell in µm?
answer boxµm
Show answer
250 µm
Hint: Divide the width of the field of view by the number of cells.
Question 6
A group of similar cells that work together to do one job is called a…
- organism
- membrane
- tissue
- organelle
Show answer
tissue
Hint: Muscle tissue is made of muscle cells working together.