Grade 7 Science practice sheet
Nova Scotia 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
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 4
A rabbit eats grass and a fox eats the rabbit. Which is the predator?
- the rabbit
- the grass
- the fox
the fox
Hint: A predator hunts and eats other animals.
Question 5
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.
Question 6
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 7
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
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.
Question 8
What are building codes?
- Colours for painting buildings
- Passwords for opening doors
- Rules that set minimum safety standards for design and construction
- Names of famous buildings
Rules that set minimum safety standards for design and construction
Hint: Codes help make sure structures are safe for the people who use them.
Question 9
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 10
A giraffe stretches its neck to reach leaves all its life. Will its calves be born with longer necks because of the stretching?
🦒- Only the male calves will
- No. Changes gained during life are not passed on in the genes
- Only if the parent stretches every single day
- Yes. Calves inherit the stretched neck
No. Changes gained during life are not passed on in the genes
Hint: Long necks became common because giraffes born with longer necks reached more food and had more calves.
Answer key
- 1. Fish that need a lot of oxygen may struggle to survive (Ecosystems)
- 2. secondary consumer (Food Chains & Energy)
- 3. Phosphorus has fallen since the limit began, so the limit may be helping (People & Ecosystems)
- 4. the fox (Netukulimk & Interconnected Life)
- 5. How the particles are arranged and how they move (Particles & Mixtures)
- 6. Heat is energy that moves from warmer to cooler; temperature measures average particle motion (Heat & Particles)
- 7. A triangle holds its shape when forces push on it (Structures & Forces)
- 8. Rules that set minimum safety standards for design and construction (Safe Structures)
- 9. Earth forms → First simple life appears in the oceans → Dinosaurs (except birds) die out → Modern humans appear in Africa (Restless Earth)
- 10. No. Changes gained during life are not passed on in the genes (Natural Selection)
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