Grade 7 Science practice sheet
Prince Edward Island Curriculum · from Gradelings · Name: ______________________
Question 1
Lake water warms during a heat wave and holds less dissolved oxygen. How might this affect fish?
- Fish are not affected at all
- Fish breathe more easily
- Fish that need a lot of oxygen may struggle to survive
- All fish grow faster
Fish that need a lot of oxygen may struggle to survive
Hint: Warm water holds less dissolved oxygen, an abiotic factor that fish need.
Question 2
A grasshopper eats grass. A frog eats the grasshopper. The frog is a…
- secondary consumer
- producer
- decomposer
- primary consumer
secondary consumer
Hint: A primary consumer eats producers. A secondary consumer eats primary consumers.
Question 3
Put the stages of primary succession in order.
- 🪨Bare rock
- 🌾Soil builds up and grasses grow
- 🌲A mature forest develops
- 🌱Shrubs and small trees take over
Bare rock → Soil builds up and grasses grow → Shrubs and small trees take over → A mature forest develops
Hint: Bare rock, then lichens and mosses, then soil and grasses, then shrubs, then forest.
Question 4
What does the data suggest?
Phosphorus in a lake (mg/L). A limit on phosphorus in detergents began in 2002. Year Phosphorus 2001 0.09 2006 0.06 2011 0.04 2016 0.03 - Phosphorus has not changed
- Phosphorus has risen since the limit began
- Phosphorus has fallen since the limit began, so the limit may be helping
- The data prove that nothing else could be involved
Phosphorus has fallen since the limit began, so the limit may be helping
Hint: Compare 2001, before the limit, with the later years. Data can suggest a link, but other causes should be ruled out before saying for sure.
Question 5
Put these events in Earth's history in order, oldest first.
- 🦠First simple life appears in the oceans
- 🌍Earth forms
- ☄️Dinosaurs (except birds) die out
- 🧍Modern humans appear in Africa
Earth forms → First simple life appears in the oceans → Dinosaurs (except birds) die out → Modern humans appear in Africa
Hint: Earth forms: about 4.6 billion years ago. First simple life appears in the oceans: at least 3.5 billion years ago. Dinosaurs (except birds) die out: about 66 million years ago. Modern humans appear in Africa: about 300,000 years ago.
Question 6
What gives Prince Edward Island’s soil and sandstone cliffs their red colour?
- salt water
- red paint
- copper wire
- iron that has rusted
iron that has rusted
Hint: Rusted iron is red-brown.
Question 7
What is weathering?
- the breaking down of rock into smaller pieces
- the melting of rock inside Earth
- the building of new mountains
- the carrying away of sand by wind
the breaking down of rock into smaller pieces
Hint: It happens in place, before anything moves the pieces.
Question 8
Which statement correctly describes heat and temperature?
- Heat and temperature mean exactly the same thing
- Heat is energy that moves from warmer to cooler; temperature measures average particle motion
- Heat measures how fast something is moving overall
- Temperature is the energy moving between objects
Heat is energy that moves from warmer to cooler; temperature measures average particle motion
Hint: Heat is a transfer of energy. Temperature is a measure of an object's particles.
Question 9
A lizard lies on a sun-warmed rock and warms up. Which type of heat transfer is warming it from below?
- conduction
- convection
- evaporation
- radiation only
conduction
Hint: Heat passes directly from the rock to the lizard where they touch.
Question 10
Water as ice, as liquid water and as water vapour has the same kind of particle. What differs in each state?
- Whether the water is pure
- How the particles are arranged and how they move
- The number of different substances
- The kind of particle
How the particles are arranged and how they move
Hint: Changing state changes the arrangement and motion, not the kind of particle.
Answer key
- 1. Fish that need a lot of oxygen may struggle to survive (Ecosystems)
- 2. secondary consumer (Food Chains & Energy)
- 3. Bare rock → Soil builds up and grasses grow → Shrubs and small trees take over → A mature forest develops (Cycles & Succession)
- 4. Phosphorus has fallen since the limit began, so the limit may be helping (People & Ecosystems)
- 5. Earth forms → First simple life appears in the oceans → Dinosaurs (except birds) die out → Modern humans appear in Africa (Restless Earth)
- 6. iron that has rusted (Rocks & Minerals)
- 7. the breaking down of rock into smaller pieces (Weathering & Erosion)
- 8. Heat is energy that moves from warmer to cooler; temperature measures average particle motion (Heat & Particles)
- 9. conduction (Moving Heat)
- 10. How the particles are arranged and how they move (Particles & Mixtures)
Want more than 10 questions?
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