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Grade 8 Science practice sheet

Manitoba 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

    A pulse is…

    • the beat of blood in the arteries as the heart pumps
    • a muscle in the leg
    • a type of cell
    • the sound of breathing
    Show answer

    the beat of blood in the arteries as the heart pumps

    Hint: You can feel it at your wrist or neck.

  3. Question 3

    What happens to the particles of a substance when it is heated?

    • They move faster.
    • They shrink.
    • They stop moving.
    • They disappear.
    Show answer

    They move faster.

    Hint: Heat adds energy, so particles move faster.

  4. Question 4

    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.

  5. Question 5

    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.

  6. Question 6

    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.

  7. Question 7

    If Earth takes in more energy than it sends out, its temperature will…

    • stay exactly the same
    • fall
    • rise
    Show answer

    rise

    Hint: Extra energy warms the planet.

  8. Question 8

    Earth's internal heat comes partly from…

    • sunlight in the core
    • radioactive decay and leftover heat from its formation
    • ocean currents
    • moonlight
    Show answer

    radioactive decay and leftover heat from its formation

    Hint: Earth has been warm inside since it formed.

  9. Question 9

    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.

  10. Question 10

    Why do we feel warm after running?

    • blood stops moving
    • the body makes heat and blood carries it to the skin
    • the Sun is nearer
    • bones make heat
    Show answer

    the body makes heat and blood carries it to the skin

    Hint: Blood helps control temperature.

Answer key

  1. 1. energy, carbon dioxide and water (Cells & Life Processes)
  2. 2. the beat of blood in the arteries as the heart pumps (Heart & Blood)
  3. 3. They move faster. (Particles & Matter)
  4. 4. gas (Density & Buoyancy)
  5. 5. the colour of the liquid (Viscosity & Flow)
  6. 6. gamma rays (Light & Radiation)
  7. 7. rise (The Sun, Energy & Climate)
  8. 8. radioactive decay and leftover heat from its formation (Inside Earth)
  9. 9. mitochondria (Cells & Life Processes)
  10. 10. the body makes heat and blood carries it to the skin (Heart & Blood)

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