Grade 7 Science practice sheet
Alberta 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
Show answer
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
Show answer
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
Show answer
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
Show answer
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
Which plant is best suited to a very dry, windy field?
- One that needs shade all day
- One with deep taproots and narrow leaves
- One with wide, thin leaves and shallow roots
- One that needs flooded soil
Show answer
One with deep taproots and narrow leaves
Hint: Deep roots reach water and narrow leaves lose less of it.
Question 6
Irrigation is…
- harvesting wheat
- spraying crops to kill insects
- adding fertilizer to soil
- watering crops by adding water from rivers, canals or wells
Show answer
watering crops by adding water from rivers, canals or wells
Hint: Irrigation helps crops in dry areas, such as southern Alberta.
Question 7
Why do some farmers avoid tilling (turning over) the soil?
- Tilling adds more water to soil
- Untilled soil keeps its structure, holds moisture and is less likely to blow away
- Tilling stops weeds forever
- Plants cannot grow in untilled soil
Show answer
Untilled soil keeps its structure, holds moisture and is less likely to blow away
Hint: No-till farming protects soil on the Prairies.
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
Show answer
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
Show answer
conduction
Hint: Heat passes directly from the rock to the lizard where they touch.
Question 10
Triangles are often used in bridge trusses. Why?
- Triangles have no corners
- A triangle holds its shape when forces push on it
- Triangles are lighter than all other shapes
- A triangle can bend without breaking
Show answer
A triangle holds its shape when forces push on it
Hint: Triangles cannot be pushed out of shape without changing the length of a side.
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. One with deep taproots and narrow leaves (How Plants Work)
- 6. watering crops by adding water from rivers, canals or wells (Plants We Use)
- 7. Untilled soil keeps its structure, holds moisture and is less likely to blow away (Growing Crops Well)
- 8. Heat is energy that moves from warmer to cooler; temperature measures average particle motion (Heat & Particles)
- 9. conduction (Moving Heat)
- 10. A triangle holds its shape when forces push on it (Structures & Forces)
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.