9th grade Science practice sheet
New York State Learning Standards · from Gradelings · Name: ______________________
Question 1
Where is the cell's DNA stored in an animal cell?
- in the cell membrane
- in the cytoplasm only
- in the nucleus
- in the mitochondria only
in the nucleus
Hint: The nucleus holds the chromosomes, which are made of DNA.
Question 2
Budding in yeast and hydra is a type of…
- fertilization
- photosynthesis
- sexual reproduction
- asexual reproduction
asexual reproduction
Hint: A bud grows off the parent and breaks off as a new organism.
Question 3
What are the products of photosynthesis?
- water and oxygen only
- glucose and oxygen
- carbon dioxide and glucose
- carbon dioxide and water
glucose and oxygen
Hint: The plant stores energy in glucose and releases oxygen.
Question 4
The pituitary gland in the brain…
- makes sperm
- makes eggs
- releases hormones that signal the ovaries or testes
releases hormones that signal the ovaries or testes
Hint: It helps control the reproductive system.
Question 5
Which came first on Earth?
- flowering plants
- single-celled organisms
- mammals
single-celled organisms
Hint: Simple life appeared billions of years before complex animals.
Question 6
The elements in Group 18 (the noble gases) rarely react because…
- they are very heavy
- they have no electrons
- their outer shells are already full
- they are liquids
their outer shells are already full
Hint: A full outer shell is stable, so noble gases don't need to gain or lose electrons.
Question 7
What does the formula CO₂ tell you?
- Carbon is an oxygen ion
- Two carbon atoms and one oxygen atom
- Carbon dioxide is an element
- One carbon atom and two oxygen atoms are in each molecule.
One carbon atom and two oxygen atoms are in each molecule.
Hint: The small number (subscript) after a symbol says how many atoms.
Question 8
Why does powdered sugar dissolve faster than a sugar cube?
- Powder is a different substance
- Powder has more surface area exposed to the water
- A cube has more mass than powder
- A cube is hotter
Powder has more surface area exposed to the water
Hint: Smaller pieces have more surface area, so more particles can react or dissolve at once.
Question 9
In a closed system, total momentum before a collision…
- equals total momentum after
- is always larger after
- becomes zero
- doubles
equals total momentum after
Hint: Conservation of momentum.
Question 10
A device takes in 500 J and gives 400 J of useful energy. What is its efficiency?
- 125%
- 80%
- 20%
80%
Hint: 400 ÷ 500 × 100.
Answer key
- 1. in the nucleus (Cells from Cells)
- 2. asexual reproduction (Reproduction)
- 3. glucose and oxygen (Photosynthesis & Respiration)
- 4. releases hormones that signal the ovaries or testes (Human Reproductive System)
- 5. single-celled organisms (Evolution & Selection)
- 6. their outer shells are already full (Atoms & Electrons)
- 7. One carbon atom and two oxygen atoms are in each molecule. (Electrons & Compounds)
- 8. Powder has more surface area exposed to the water (Chemical Change)
- 9. equals total momentum after (Forces, Motion & Momentum)
- 10. 80% (Energy & Magnetism)
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.