9th grade Science practice sheet
Arizona Academic Standards · from Gradelings · Name: ______________________
Question 1
How are plant cells different in the last stage of cell division?
- They build a new cell plate between the two cells.
- They explode.
- They skip it.
- They make a new nucleus only.
They build a new cell plate between the two cells.
Hint: Plant cells have rigid walls, so a cell plate forms and becomes the new wall.
Question 2
Which is a way flowering plants reproduce sexually?
- A leaf grows into a new plant
- A branch is cut and planted
- Pollen from one flower fertilizes another flower's ovule
- A tuber sprouts
Pollen from one flower fertilizes another flower's ovule
Hint: Pollination moves pollen to the female part of a flower so seeds can form.
Question 3
In the periodic table, a period (row) tells you…
- the element's state at 0 °C
- the number of electron shells in the atom
- the number of neutrons
- the color of the element
the number of electron shells in the atom
Hint: Elements in the same row have the same number of occupied shells.
Question 4
Why does chlorine (7 valence electrons) form a negative ion?
- It loses seven electrons.
- It gains one electron to fill its outer shell.
- It never bonds.
- It loses a proton.
It gains one electron to fill its outer shell.
Hint: Gaining one electron gives chlorine 8 outer electrons and a charge of −1.
Question 5
What happens to the dynamic equilibrium of the atmosphere if photosynthesis falls and respiration and burning continue?
- Nitrogen levels rise
- Carbon dioxide levels rise
- Nothing changes
- Oxygen levels rise sharply
Carbon dioxide levels rise
Hint: Less carbon dioxide is removed, while it is still being added.
Question 6
Which property do all metals share at room temperature, except mercury?
- they are gases
- they are brittle
- they do not conduct
- they are solid
they are solid
Hint: Most metals are solid, and mercury is the exception.
Question 7
In N₂ + 3H₂ → 2NH₃, how many hydrogen atoms are on the left side (reactants)?
answer box
6
Hint: 3 molecules of H₂, each with 2 hydrogen atoms, is 3 × 2 = 6.
Question 8
If a climate becomes colder, the selective pressures on a population of animals will…
- change
- stay exactly the same
- disappear
change
Hint: Different traits may help in the new conditions.
Question 9
The law of conservation of energy says that energy…
- cannot be created or destroyed, only changed from one form to another
- disappears when used
- can be made from nothing
cannot be created or destroyed, only changed from one form to another
Hint: The total amount stays the same.
Question 10
A 2 kg cart accelerates at 3 m/s². What net force acts on it?
- 5 N
- 9 N
- 1.5 N
- 6 N
6 N
Hint: F = m × a.
Answer key
- 1. They build a new cell plate between the two cells. (Cells from Cells)
- 2. Pollen from one flower fertilizes another flower's ovule (Reproduction)
- 3. the number of electron shells in the atom (Atoms & Electrons)
- 4. It gains one electron to fill its outer shell. (Electrons & Compounds)
- 5. Carbon dioxide levels rise (Photosynthesis & Respiration)
- 6. they are solid (The Periodic Table)
- 7. 6 (Chemical Change)
- 8. change (Evolution & Selection)
- 9. cannot be created or destroyed, only changed from one form to another (Energy & Magnetism)
- 10. 6 N (Forces, Motion & Momentum)
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.