9th grade Science practice sheet
Texas Essential Knowledge and Skills (TEKS) · from Gradelings · Name: ______________________
Question 1
Why can a cut on your skin heal?
- The air makes new cells.
- Nearby cells divide to replace the damaged ones.
- Blood turns into skin.
- Skin is non-living.
Nearby cells divide to replace the damaged ones.
Hint: Mitosis makes new cells to fill in the injury.
Question 2
Which is a way flowering plants reproduce sexually?
- Pollen from one flower fertilizes another flower's ovule
- A tuber sprouts
- A branch is cut and planted
- A leaf grows into a new plant
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
How does a vaccine help protect you?
- It kills all germs in the body immediately.
- It removes the need for hand washing.
- It trains the immune system to recognize a germ before you are exposed to the real thing.
- It replaces your white blood cells.
It trains the immune system to recognize a germ before you are exposed to the real thing.
Hint: A vaccine uses a safe piece or weakened form of a germ so the body can make memory cells.
Question 4
Which statement describes a vaccine best?
- It is an antibiotic
- It is a vitamin
- It protects against a disease but does not treat everyone already sick
It protects against a disease but does not treat everyone already sick
Hint: Vaccines prevent, antibiotics treat bacterial infections.
Question 5
A cactus's thick stem that stores water is an adaptation to…
- ocean tides
- cold lakes
- dry climates
dry climates
Hint: It helps the plant survive long periods without rain.
Question 6
Where in a cell is most of the energy released by cellular respiration?
- the cell membrane
- the nucleus
- chloroplasts
- mitochondria
mitochondria
Hint: Mitochondria are the cell's energy converters.
Question 7
Which biomolecule carries genetic information?
- Amino acids
- Nucleic acids
- Carbohydrates
- Lipids
Nucleic acids
Hint: DNA and RNA.
Question 8
Mitochondria may have come from bacteria that lived inside other cells. This idea is…
- spontaneous generation
- endosymbiotic theory
- plate tectonics
- cell theory
endosymbiotic theory
Hint: Mitochondria have their own DNA.
Question 9
A DNA nucleotide is made of a sugar, a phosphate and a…
- nitrogen base
- amino acid
- glucose chain
- fatty acid
nitrogen base
Hint: A, T, C or G.
Question 10
Tt × Tt. What is the expected genotype ratio?
- 1 TT : 1 tt
- all Tt
- 3 TT : 1 tt
- 1 TT : 2 Tt : 1 tt
1 TT : 2 Tt : 1 tt
Hint: Fill in the square.
Answer key
- 1. Nearby cells divide to replace the damaged ones. (Cells from Cells)
- 2. Pollen from one flower fertilizes another flower's ovule (Reproduction)
- 3. It trains the immune system to recognize a germ before you are exposed to the real thing. (Microbes & the Immune System)
- 4. It protects against a disease but does not treat everyone already sick (Infectious Disease)
- 5. dry climates (Evolution & Selection)
- 6. mitochondria (Photosynthesis & Respiration)
- 7. Nucleic acids (Biomolecules & Enzymes)
- 8. endosymbiotic theory (Cell Types, Transport & Specialization)
- 9. nitrogen base (DNA, RNA & Proteins)
- 10. 1 TT : 2 Tt : 1 tt (Genetic Crosses)
Want more than 10 questions?
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