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Grade 9 Science practice sheet

BC Curriculum · from Gradelings · Name: ______________________

  1. 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
    Show answer

    copied, so each new cell gets a full set

    Hint: DNA replication ensures each daughter cell receives complete instructions.

  2. 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
    Show answer

    When a sperm cell and an egg cell join

    Hint: Fertilization combines genetic material from two parents into a new cell.

  3. Question 3

    How many electron shells (energy levels) are used by a neutral fluorine atom?

    • 1
    • 2
    • 3
    • 4
    Show answer

    2

    Hint: Fluorine has 9 electrons arranged 2-7, so 2 shells are in use.

  4. 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)
    Show answer

    ⚡ 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).

  5. 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
    Show answer

    A build-up of electric charge on an object

    Hint: Rubbing materials together can transfer electrons, leaving objects charged.

  6. 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
    Show answer

    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).

  7. Question 7

    During which stage do chromosomes line up in the middle of the cell?

    • telophase
    • metaphase
    • anaphase
    • prophase
    Show answer

    metaphase

    Hint: In metaphase, chromosomes line up along the cell's centre before being pulled apart.

  8. 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.
    Show answer

    Little genetic variety, so one disease can harm the whole population.

    Hint: Identical organisms share the same weaknesses.

  9. 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
    Show answer

    one valence electron that is easily lost

    Hint: Losing one electron gives them a stable arrangement.

  10. 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
    Show answer

    the ions are free to move and carry charge

    Hint: Free-moving ions can carry current in solution.

Answer key

  1. 1. copied, so each new cell gets a full set (Cells from Cells)
  2. 2. When a sperm cell and an egg cell join (Reproduction)
  3. 3. 2 (Atoms & Electrons)
  4. 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. 5. A build-up of electric charge on an object (Electric Current)
  6. 6. All the living and non-living things in an area, and how they interact (Cycles & Sustainability)
  7. 7. metaphase (Cells from Cells)
  8. 8. Little genetic variety, so one disease can harm the whole population. (Reproduction)
  9. 9. one valence electron that is easily lost (Atoms & Electrons)
  10. 10. the ions are free to move and carry charge (Electrons & Compounds)

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