BTEC Applied Science Unit 8A Practice
Exam Questions with Correct Answers
(Verified Answers) plus Rationales 2026
Q&A | Instant Download Pdf
1. Which structure controls what enters and leaves a cell?
A. Nucleus
B. Cell wall
C. Cell membrane
D. Cytoplasm
Answer: C
Rationale: The membrane controls movement of substances.
2. Which process requires energy?
A. Diffusion
B. Osmosis
C. Active transport
D. Evaporation
Answer: C
Rationale: Active transport uses energy (ATP).
3. A student increases substrate concentration in an enzyme test. Expected
result:
A. Rate decreases
B. Rate increases then levels off
C. No change
D. Random change
Answer: B
Rationale: Enzyme activity increases until saturation.
4. The function of the nucleus is:
A. Energy production
B. Control cell activities
, C. Transport oxygen
D. Store nutrients
Answer: B
Rationale: The nucleus contains genetic material and controls cell functions.
5. Which factor is NOT needed for photosynthesis?
A. Light
B. Carbon dioxide
C. Oxygen
D. Chlorophyll
Answer: C
Rationale: Oxygen is a product, not a reactant.
6. A student uses a water bath in an enzyme experiment to:
A. Change pH
B. Control temperature
C. Increase oxygen
D. Reduce enzyme concentration
Answer: B
Rationale: Water baths maintain constant temperature.
7. What is diffusion rate affected by?
A. Colour
B. Concentration gradient
C. Shape of container only
D. Mass
Answer: B
Rationale: Steeper gradients increase diffusion rate.
8. Which organelle contains genetic material?
A. Mitochondria only
B. Nucleus
C. Ribosome
D. Vacuole
Answer: B
Rationale: DNA is found in the nucleus.
, 9. A student measures enzyme activity at 0°C. Expected result:
A. Maximum activity
B. No activity
C. Normal activity
D. High activity
Answer: B
Rationale: Low temperatures reduce enzyme activity significantly.
10.What is a hypothesis?
A. Final result
B. Scientific prediction
C. Conclusion only
D. Measurement tool
Answer: B
Rationale: A hypothesis is a testable prediction.
11.Which is an example of a dependent variable?
A. Temperature
B. Time
C. Rate of reaction
D. pH
Answer: C
Rationale: The dependent variable is measured.
12.What is meant by reliability?
A. Accuracy of one result
B. Consistency of results
C. Speed of experiment
D. Cost of experiment
Answer: B
Rationale: Reliable results are consistent.
13.Which organelle produces proteins?
A. Ribosomes
B. Nucleus
C. Mitochondria
D. Chloroplast
Exam Questions with Correct Answers
(Verified Answers) plus Rationales 2026
Q&A | Instant Download Pdf
1. Which structure controls what enters and leaves a cell?
A. Nucleus
B. Cell wall
C. Cell membrane
D. Cytoplasm
Answer: C
Rationale: The membrane controls movement of substances.
2. Which process requires energy?
A. Diffusion
B. Osmosis
C. Active transport
D. Evaporation
Answer: C
Rationale: Active transport uses energy (ATP).
3. A student increases substrate concentration in an enzyme test. Expected
result:
A. Rate decreases
B. Rate increases then levels off
C. No change
D. Random change
Answer: B
Rationale: Enzyme activity increases until saturation.
4. The function of the nucleus is:
A. Energy production
B. Control cell activities
, C. Transport oxygen
D. Store nutrients
Answer: B
Rationale: The nucleus contains genetic material and controls cell functions.
5. Which factor is NOT needed for photosynthesis?
A. Light
B. Carbon dioxide
C. Oxygen
D. Chlorophyll
Answer: C
Rationale: Oxygen is a product, not a reactant.
6. A student uses a water bath in an enzyme experiment to:
A. Change pH
B. Control temperature
C. Increase oxygen
D. Reduce enzyme concentration
Answer: B
Rationale: Water baths maintain constant temperature.
7. What is diffusion rate affected by?
A. Colour
B. Concentration gradient
C. Shape of container only
D. Mass
Answer: B
Rationale: Steeper gradients increase diffusion rate.
8. Which organelle contains genetic material?
A. Mitochondria only
B. Nucleus
C. Ribosome
D. Vacuole
Answer: B
Rationale: DNA is found in the nucleus.
, 9. A student measures enzyme activity at 0°C. Expected result:
A. Maximum activity
B. No activity
C. Normal activity
D. High activity
Answer: B
Rationale: Low temperatures reduce enzyme activity significantly.
10.What is a hypothesis?
A. Final result
B. Scientific prediction
C. Conclusion only
D. Measurement tool
Answer: B
Rationale: A hypothesis is a testable prediction.
11.Which is an example of a dependent variable?
A. Temperature
B. Time
C. Rate of reaction
D. pH
Answer: C
Rationale: The dependent variable is measured.
12.What is meant by reliability?
A. Accuracy of one result
B. Consistency of results
C. Speed of experiment
D. Cost of experiment
Answer: B
Rationale: Reliable results are consistent.
13.Which organelle produces proteins?
A. Ribosomes
B. Nucleus
C. Mitochondria
D. Chloroplast
