Required Practicals Practice Questions and Mark Schemes
Question 1
Q1. Knowledge Recall (1 mark)
Define the term aseptic technique and explain its importance in biological investigations.
Question 2
Q2. Application of Knowledge (2 marks)
State the purpose of using Benedict's reagent in a reducing sugar test and describe the expected result.
Question 3
Q3. Extended Response (3 marks)
Describe the steps involved in preparing a wet mount of a leaf epidermis to observe chloroplasts under a microscope.
Question 4
Q4. Knowledge Recall (1 mark)
What is the independent variable in an investigation to determine the effect of temperature on enzyme activity?
Question 5
Q5. Application of Knowledge (2 marks)
Explain how the reliability of an investigation can be improved.
Question 6
Q6. Extended Response (4 marks)
Describe how the results of an investigation into the effect of osmosis on plant cells could be presented in a graph.
Question 7
Q7. Knowledge Recall (1 mark)
What does a positive result in an iodine test indicate?
Question 8
Q8. Application of Knowledge (2 marks)
Explain the difference between accuracy and precision in biological investigations.
Question 9
Q9. Extended Response (3 marks)
Describe how you could use a Biuret reagent to test for the presence of protein and explain the expected result.
Question 10
Q10. Application of Knowledge (2 marks)
State one reason why anomalies may occur in biological investigations and suggest a strategy to minimize their impact.