Grade 9 Science practice sheet
Yukon Curriculum · from Gradelings · Name: ______________________
Question 1
Before a cell divides, the DNA is…
- removed from the cell
- copied, so each new cell gets a full set
- split into random pieces
- destroyed
copied, so each new cell gets a full set
Hint: DNA replication ensures each daughter cell receives complete instructions.
Question 2
What is fertilization?
- When a sperm cell and an egg cell join
- When a plant makes sugar
- When a seed is planted
- When a cell divides in two
When a sperm cell and an egg cell join
Hint: Fertilization combines genetic material from two parents into a new cell.
Question 3
How many electron shells (energy levels) are used by a neutral fluorine atom?
- 1
- 2
- 3
- 4
2
Hint: Fluorine has 9 electrons arranged 2-7, so 2 shells are in use.
Question 4
Ionic or covalent? Sort each compound.
Sort into: ⚡ Ionic · 🤝 Covalent
- 🔥CH₄ (methane)
- 🧂NaCl (table salt)
- ⚗️MgO (magnesium oxide)
- 🧪KBr (potassium bromide)
- 🌫️CO₂ (carbon dioxide)
- 💧H₂O (water)
- 🧴NH₃ (ammonia)
- 🧊CaCl₂ (calcium chloride)
⚡ Ionic: NaCl (table salt), MgO (magnesium oxide), KBr (potassium bromide), CaCl₂ (calcium chloride) · 🤝 Covalent: CH₄ (methane), CO₂ (carbon dioxide), H₂O (water), NH₃ (ammonia)
Hint: Ionic compounds are usually a metal plus a non-metal (like NaCl). Covalent compounds are usually two or more non-metals sharing electrons (like H₂O).
Question 5
What is static electricity?
- Heat in a circuit
- A flow of charge in a wire
- A build-up of electric charge on an object
- A kind of battery
A build-up of electric charge on an object
Hint: Rubbing materials together can transfer electrons, leaving objects charged.
Question 6
What is an ecosystem?
- A kind of weather
- All the living and non-living things in an area, and how they interact
- Only the animals in a place
- Only the plants in a place
All the living and non-living things in an area, and how they interact
Hint: Ecosystems include organisms (biotic factors) and their environment (abiotic factors).
Question 7
During which stage do chromosomes line up in the middle of the cell?
- telophase
- metaphase
- anaphase
- prophase
metaphase
Hint: In metaphase, chromosomes line up along the cell's centre before being pulled apart.
Question 8
Which is a disadvantage of asexual reproduction?
- Offspring are always different.
- It is slow.
- It needs two parents.
- Little genetic variety, so one disease can harm the whole population.
Little genetic variety, so one disease can harm the whole population.
Hint: Identical organisms share the same weaknesses.
Question 9
Group 1 elements, the alkali metals, are very reactive because they have…
- a full outer shell
- one valence electron that is easily lost
- no neutrons
- eight valence electrons
one valence electron that is easily lost
Hint: Losing one electron gives them a stable arrangement.
Question 10
A salt crystal such as NaCl conducts electricity when dissolved in water because…
- the water turns into metal
- the electrons are destroyed
- the ions are free to move and carry charge
- the atoms melt
the ions are free to move and carry charge
Hint: Free-moving ions can carry current in solution.
Answer key
- 1. copied, so each new cell gets a full set (Cells from Cells)
- 2. When a sperm cell and an egg cell join (Reproduction)
- 3. 2 (Atoms & Electrons)
- 4. ⚡ Ionic: NaCl (table salt), MgO (magnesium oxide), KBr (potassium bromide), CaCl₂ (calcium chloride) · 🤝 Covalent: CH₄ (methane), CO₂ (carbon dioxide), H₂O (water), NH₃ (ammonia) (Electrons & Compounds)
- 5. A build-up of electric charge on an object (Electric Current)
- 6. All the living and non-living things in an area, and how they interact (Cycles & Sustainability)
- 7. metaphase (Cells from Cells)
- 8. Little genetic variety, so one disease can harm the whole population. (Reproduction)
- 9. one valence electron that is easily lost (Atoms & Electrons)
- 10. the ions are free to move and carry charge (Electrons & Compounds)
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