中四 生物試卷 (F4 Biology Past Paper)
St Paul F4_Bio-Mid-year_SQ
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Time allowed: 1 hour 30 minutes
Section B Total
Section B Structured Questions (50 marks)
Answer ALL questions in the spaces provided in this Question-Answer Book.
In each question, one additional mark will be awarded for effective communication.
The words "End of Paper" should appear after the last question.
When the enzyme catalase is added to hydrogen peroxide, the following reaction occurs:
In an investigation into the effect of temperature on the rate of this reaction, a student set up
apparatus as shown in the diagram below, using liquidized celery as a source of catalase.
2 H₂O (1) + O2 (g)
The student measured the volume of oxygen produced at five different temperatures using samples
of the liquidized celery.
State the other variable that needs to be measured in order to calculate the rate of reaction.
Identify one potential problem with using samples of liquidized celery as a source of catalase in this
investigation and suggest a way to minimize this problem.
(iii) The student collected the data as shown in the table below.
Suggest how the student could check the reliability of the data.
Another student carried out a similar procedure and presented his results in the graph below.
Volume of oxygen (cm³)
Describe the data shown in the graph above.
A student carried out an investigation to determine the effects of different sucrose concentrations on
cells from pieces of onion epidermis.
(1) Strips of epidermis were taken from an onion.
(2) Separate pieces of epidermis were placed into water and a range of sucrose solutions.
(3) The pieces of epidermis were left for 30 minutes before being removed.
(4) The pieces of epidermis were then viewed at high-power under the microscope.
The student counted 100 cells from each piece of epidermis. The student noted how many cells had
become plasmolysed. The results are shown in the table below.
Concentration of sucrose Water potential of
solution (mol dm-³)
sucrose solution (kPa)
Percentage of cells
None of the onion epidermis cells this student observed had burst when left in pure water. Explain
why plant cells do not burst when they are left in pure water.
The water potential of the onion epidermis cells can be assumed to be the same as the water
potential of a solution that causes 50% plasmolysis. Use the information from the table to estimate
the water potential inside these onion epidermis cells.
(2) Suggest how the student could construct and use a graph to obtain a better estimate of the water
(iii) Suggest how the student could modify the procedure to make the results more reliable and accurate.
A Petri dish was filled with agar jelly containing blue DCPIP.
Three holes were cut out of the agar jelly.
One hole was filled with 1 cm³ of water, one with 1 cm³ of fruit juice X and one with 1 cm³ of fruit
The fruit juices contained different concentrations of vitamin C.
The Petri dish was left for 60 minutes.
fruit juice X
agar jelly containing
(2) How did you reach this conclusion?
fruit juice Y
Use the results found after 60 minutes to answer the following questions.
After 60 minutes
(i)(1) What conclusion can be drawn about the concentration of vitamin C in fruit juice Y compared to
fruit juice X?
(3) Explain the changes shown in the jelly around the fruit juices.
3. The photograph below shows part of the lower jaw of a man:
Why was water added to one of the holes?
(a) Which type of teeth is X?
With reference to the photograph, describe how the external features of teeth X and Y
are related to their respective functions.
(ii) Explain why his idea is wrong.
The man has the idea that intake of more calcium-rich food can prevent further decay
of tooth Z.
(i) What is the use of calcium to the teeth?
(d) Draw a labelled diagram of a vertical section of tooth Z at the early stage of decay.
The diagram below show a group of air sacs of the lung and a villus of the small intestine with their
associated capillaries. The arrows indicate the direction of blood flow. (The two diagrams are
not drawn to the same scale.)
(ii) the villus.
Air sacs of the lung
Name one substance that is absorbed into the blood of
the air sacs.
A villus of the small intestine
Both the air sacs and the villus are richly supplied with blood capillaries. State two
reasons to explain how this feature can speed up the absorption of substances.
By means of a flowchart, indicate the route by which blood in a person is transported
from A to B. Indicate the major blood vessels and heart chambers involved.
Explain the change in the carbon dioxide content when the blood in A flows to B.
- End of Paper-