Grade 8 Science practice sheet
Yukon Curriculum · from Gradelings · Name: ______________________
Question 1
What are the products of cellular respiration?
- energy, carbon dioxide and water
- glucose and oxygen
- only sugar
- only oxygen
energy, carbon dioxide and water
Hint: Cells use glucose and oxygen to release energy, making carbon dioxide and water.
Question 2
A fever during an infection can be helpful because…
- it kills the person's own cells
- a higher body temperature can slow some germs and boost the immune response
- it cures every illness
- it replaces antibodies
a higher body temperature can slow some germs and boost the immune response
Hint: Fever is one of the body's defence responses, though very high fevers need medical care.
Question 3
What happens to the particles of a substance when it is heated?
- They move faster.
- They shrink.
- They stop moving.
- They disappear.
They move faster.
Hint: Heat adds energy, so particles move faster.
Question 4
Which has the shortest wavelength?
- infrared
- gamma rays
- visible light
- microwaves
gamma rays
Hint: Gamma rays have the shortest wavelength and the most energy.
Question 5
Which type of plate boundary is it? Sort each description.
Sort into: ↔️ Divergent · ➡️⬅️ Convergent · ↕️ Transform
- 🌉the San Andreas Fault
- 🏔️two continents collide to build mountains
- 🌊new crust forms at a mid-ocean ridge
- 🏜️plates pull apart in a rift valley
- ⚡plates grind sideways past each other
- 🌋an oceanic plate sinks under a continent
↔️ Divergent: new crust forms at a mid-ocean ridge, plates pull apart in a rift valley · ➡️⬅️ Convergent: two continents collide to build mountains, an oceanic plate sinks under a continent · ↕️ Transform: the San Andreas Fault, plates grind sideways past each other
Hint: Divergent boundaries pull apart (new crust). Convergent boundaries push together (mountains, subduction). Transform boundaries slide past each other.
Question 6
Which organelle releases energy from food for the cell?
- chloroplast
- cell membrane
- mitochondria
- nucleus
mitochondria
Hint: Mitochondria carry out cellular respiration, releasing usable energy.
Question 7
Antibiotics are used to treat infections caused by…
- allergies
- bacteria
- viruses
- dust
bacteria
Hint: Antibiotics do not work on viruses such as those that cause colds and flu.
Question 8
Which is a physical change?
- Milk turning sour
- Wood burning
- Ice melting
- Iron rusting
Ice melting
Hint: In a physical change, no new substance forms.
Question 9
Which has the longest wavelength?
- ultraviolet
- visible light
- X-rays
- radio waves
radio waves
Hint: In order from longest to shortest: radio, microwave, infrared, visible, ultraviolet, X-ray, gamma.
Question 10
The “Ring of Fire” is a belt of earthquakes and volcanoes around which ocean?
- the Indian Ocean
- the Arctic Ocean
- the Atlantic Ocean
- the Pacific Ocean
the Pacific Ocean
Hint: Many plate boundaries meet around the edge of the Pacific.
Answer key
- 1. energy, carbon dioxide and water (Cells & Life Processes)
- 2. a higher body temperature can slow some germs and boost the immune response (Microbes & the Immune System)
- 3. They move faster. (Particles & Matter)
- 4. gamma rays (Light & Radiation)
- 5. ↔️ Divergent: new crust forms at a mid-ocean ridge, plates pull apart in a rift valley · ➡️⬅️ Convergent: two continents collide to build mountains, an oceanic plate sinks under a continent · ↕️ Transform: the San Andreas Fault, plates grind sideways past each other (Plate Tectonics)
- 6. mitochondria (Cells & Life Processes)
- 7. bacteria (Microbes & the Immune System)
- 8. Ice melting (Particles & Matter)
- 9. radio waves (Light & Radiation)
- 10. the Pacific Ocean (Plate Tectonics)
Want more than 10 questions?
In Gradelings the questions change every time and adjust to your child, with hints and kind feedback. See all science units.