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Grade 8 Science practice sheet

Saskatchewan Curriculum · from Gradelings · Name: ______________________

  1. Question 1

    What are the products of cellular respiration?

    • energy, carbon dioxide and water
    • glucose and oxygen
    • only sugar
    • only oxygen
    Show answer

    energy, carbon dioxide and water

    Hint: Cells use glucose and oxygen to release energy, making carbon dioxide and water.

  2. Question 2

    Which has the shortest wavelength?

    • infrared
    • gamma rays
    • visible light
    • microwaves
    Show answer

    gamma rays

    Hint: Gamma rays have the shortest wavelength and the most energy.

  3. Question 3

    Which state of matter usually has the lowest density?

    • They are all the same.
    • solid
    • gas
    • liquid
    Show answer

    gas

    Hint: Gas particles are very far apart.

  4. Question 4

    Which factor does NOT directly change how fast a liquid flows through a pipe?

    • the width of the pipe
    • the length of the pipe
    • the colour of the liquid
    • the viscosity of the liquid
    Show answer

    the colour of the liquid

    Hint: Narrow, long pipes and thick fluids slow flow. Colour does not matter.

  5. Question 5

    A force of 80 N pushes on an area of 4 m². What is the pressure in Pa (N/m²)?

    answer boxPa

    Show answer

    20 Pa

    Hint: Pressure = force ÷ area.

  6. Question 6

    How does the heart act like the pump in a hydraulic system?

    • It stores air in tanks.
    • It removes all pressure.
    • It pushes fluid through a network of tubes.
    • It changes the fluid into a solid.
    Show answer

    It pushes fluid through a network of tubes.

    Hint: Both pumps create the pressure that moves a fluid.

  7. Question 7

    A map shows arrows for flowing water. Which arrow direction shows the right flow?

    🗺️
    • toward the north only
    • toward the nearest town
    • from low land to high land
    • from high land toward low land
    Show answer

    from high land toward low land

    Hint: Gravity pulls runoff downhill.

  8. Question 8

    Which feature is made when a river flows around a curve and slowly moves sideways?

    〰️
    • an esker
    • a dune
    • a moraine
    • a meander
    Show answer

    a meander

    Hint: Rivers erode the outside of bends and deposit on the inside.

  9. Question 9

    The Quill Lakes in Saskatchewan are important for…

    🦆
    • migrating birds
    • whales
    • coral reefs
    • polar bears
    Show answer

    migrating birds

    Hint: They are a stop on bird migration routes and are saline.

  10. Question 10

    Which organelle releases energy from food for the cell?

    • chloroplast
    • cell membrane
    • mitochondria
    • nucleus
    Show answer

    mitochondria

    Hint: Mitochondria carry out cellular respiration, releasing usable energy.

Answer key

  1. 1. energy, carbon dioxide and water (Cells & Life Processes)
  2. 2. gamma rays (Light & Radiation)
  3. 3. gas (Density & Buoyancy)
  4. 4. the colour of the liquid (Viscosity & Flow)
  5. 5. 20 Pa (Pressure & Pascal's Law)
  6. 6. It pushes fluid through a network of tubes. (Hydraulics & Pneumatics)
  7. 7. from high land toward low land (Changes to Our Water)
  8. 8. a meander (Wind, Water & Ice Shape the Land)
  9. 9. migrating birds (Life in Lakes & Oceans)
  10. 10. mitochondria (Cells & Life Processes)

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