Grade 7 Science practice sheet
Yukon Curriculum · from Gradelings · Name: ______________________
Question 1
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.
Question 2
Which particles are found in the nucleus (centre) of an atom?
- only electrons
- neutrons and electrons
- electrons and protons
- protons and neutrons
protons and neutrons
Hint: Electrons move around the outside of the nucleus. Protons and neutrons are packed in the centre.
Question 3
In a series circuit, the current has…
- two or more separate paths
- a path that skips every bulb
- only one path to follow
- no path at all
only one path to follow
Hint: In series, everything is connected one after another in a single loop.
Question 4
Which change would make an electromagnet stronger?
- Using a wooden core instead of iron
- Wrapping more coils of wire around the core
- Switching the current off
- Using fewer coils of wire
Wrapping more coils of wire around the core
Hint: More coils, more current, or an iron core all make an electromagnet stronger.
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
Put the steps of the greenhouse effect in order.
- 🌫️Greenhouse gases absorb some heat and send part back down
- 🌍Land and oceans absorb the light and warm up
- ♨️The warm surface gives off heat (infrared energy)
- ☀️Sunlight passes through the atmosphere to Earth's surface
Sunlight passes through the atmosphere to Earth's surface → Land and oceans absorb the light and warm up → The warm surface gives off heat (infrared energy) → Greenhouse gases absorb some heat and send part back down
Hint: Energy arrives as sunlight, warms the surface, leaves as heat, and some of that heat is held in by greenhouse gases.
Question 7
What is an adaptation?
🦎- A change an animal decides to make during its life
- Any trait at all, even one that makes survival harder
- An inherited trait that helps a living thing survive and reproduce in its environment
- A habit an animal learns by watching others
An inherited trait that helps a living thing survive and reproduce in its environment
Hint: Adaptations are passed down through genes and make an organism better suited to where it lives.
Question 8
Which property is typical of a solid non-metal, such as sulphur?
- dull and brittle
- a good conductor of electricity
- easy to hammer into thin sheets
- shiny and bendable
dull and brittle
Hint: Non-metals are usually poor conductors, and as solids they tend to be dull and break easily.
Question 9
A parallel circuit has 5 identical bulbs and a battery. One bulb burns out. How many bulbs stay lit?
💡💡💡💡💡answer box
4
Hint: In a parallel circuit, each bulb is on its own branch. The other branches are still complete, so those bulbs stay lit.
Question 10
Why do scrapyards use electromagnets, not permanent magnets, to lift old cars?
🏗️- Electromagnets work without electricity
- Permanent magnets can't lift metal
- Permanent magnets only attract plastic
- An electromagnet can be switched off to drop the load
An electromagnet can be switched off to drop the load
Hint: Turning the current off makes the electromagnet let go exactly where the crane operator wants.
Answer key
- 1. No. Changes gained during life are not passed on in the genes (Natural Selection)
- 2. protons and neutrons (Atoms & Elements)
- 3. only one path to follow (Circuits & Static)
- 4. Wrapping more coils of wire around the core (Magnets & Motors)
- 5. Earth forms → First simple life appears in the oceans → Dinosaurs (except birds) die out → Modern humans appear in Africa (Restless Earth)
- 6. Sunlight passes through the atmosphere to Earth's surface → Land and oceans absorb the light and warm up → The warm surface gives off heat (infrared energy) → Greenhouse gases absorb some heat and send part back down (Changing Climate)
- 7. An inherited trait that helps a living thing survive and reproduce in its environment (Natural Selection)
- 8. dull and brittle (Atoms & Elements)
- 9. 4 (Circuits & Static)
- 10. An electromagnet can be switched off to drop the load (Magnets & Motors)
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