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Grade 8 · Science · Unit 9 of 22

Cells, Tissues & Organs

Single cells, specialized cells, diffusion and osmosis

What your child practises

Why cells are the basic unit of life, how plant and animal cells differ, how materials move into and out of cells, and how cells form tissues, organs and systems. Includes working out microscope magnification.

Alberta Curriculum learning outcome: Unit B: Cells and Systems · the role of cells, single-celled and multicelled organisms, plant and animal cells, diffusion and osmosis, and cells, tissues and organs

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    Which of these shows how living things are organized, from small to large?

    • organ, cell, tissue, organism, organ system
    • tissue, cell, organism, organ, organ system
    • organism, organ system, cell, tissue, organ
    • cell, tissue, organ, organ system, organism
    Show answer

    cell, tissue, organ, organ system, organism

    Hint: Cells form tissues, tissues form organs, organs form systems and systems form an organism.

  2. Question 2

    Which part of a plant cell captures light energy for making food?

    • cell wall
    • nucleus
    • chloroplast
    • vacuole
    Show answer

    chloroplast

    Hint: Chloroplasts contain the green chlorophyll that captures light energy.

  3. Question 3

    A slice of celery placed in salty water goes limp. What is the best explanation?

    • Salt moves out of the cells.
    • Water moves out of the cells by osmosis.
    • The cells split in two.
    • The celery makes more water.
    Show answer

    Water moves out of the cells by osmosis.

    Hint: Water moves toward the side with more dissolved material, which here is the outside.

  4. Question 4

    Osmosis is the movement of which material through a cell membrane?

    • salt
    • sugar
    • water
    • oxygen only
    Show answer

    water

    Hint: Osmosis is the diffusion of water across a membrane.

  5. Question 5

    Which cells carry oxygen around the body?

    • bone cells
    • nerve cells
    • red blood cells
    • skin cells
    Show answer

    red blood cells

    Hint: Red blood cells pick up oxygen in the lungs and deliver it to the body.

  6. Question 6

    Which of these is a single-celled organism?

    • a poplar tree
    • a goldfish
    • a grizzly bear
    • an amoeba
    Show answer

    an amoeba

    Hint: An amoeba is one cell that does all the jobs of living.

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