0653.B2.2.02 — Calculate magnification and size of biological 3 Convert measurements between millimetres specimens using millimetres as units (mm) and micr: past paper questions
Real questions on 0653.b2.2.02 — calculate magnification and size of biological 3 convert measurements between millimetres specimens using millimetres as units (mm) and micr
The newest 20 of 32 written questions. Open one to see it on the real paper.
- 0653/01 · Specimen 2025 · Q7[1]
Which set of results is correct?
See it on the paper → - 0653/06 · Specimen 2025 · Q4cii[1]
State the type of error shown in Fig. 4.4.
See it on the paper → - 0653/41 · October/November 2025 · Q1b(i)[3]
Arrow L in Fig. 1.2 shows the length of the head of the sperm cell in the drawing. Arrow L is 20 mm in length. The magnification of the drawing is ×4000. Calculate the actual length of the head of the sperm cell in micrometers (μm). actual length = μm
See it on the paper → - 0653/43 · May/June 2025 · Q1b(ii)[3]
The diameter of the inside of the artery is indicated by line Q in Fig. 1.2. Line Q is 15 mm in length. The magnification of the image is ×75. Calculate the actual diameter of the inside of the artery in micrometres (μm). actual diameter = μm
See it on the paper → - 0653/43 · May/June 2025 · Q3a(i)[1]
Identify the part labelled W in Fig. 3.1.
See it on the paper → - 0653/63 · May/June 2025 · Q1a(ii)[1]
Calculate the percentage of pea seeds that germinate in flask B. Use the equation shown. percentage of pea seeds that germinate = Record this value in Table 1.1. number of germinated pea seeds × 100 total number of pea seeds in flask
See it on the paper → - 0653/63 · May/June 2025 · Q1a(iii)[3]
On the grid, plot the percentage of pea seeds that germinate (vertical axis) against the percentage concentration of oxygen.
See it on the paper → - 0653/63 · May/June 2025 · Q1a(iv)[1]
Draw the curve of best fit.
See it on the paper → - 0653/63 · May/June 2025 · Q1a(v)[1]
Describe the relationship between the percentage concentration of oxygen and the percentage of pea seeds that germinate.
See it on the paper → - 0653/63 · May/June 2025 · Q1a(vi)[1]
Explain why the percentage of pea seeds that germinate is plotted and not the number of pea seeds that germinate.
See it on the paper → - 0653/63 · May/June 2025 · Q1a(vii)[2]
The student observes that the pea seeds produce heat when they germinate. Explain why. This means that the investigation is not a fair test.
See it on the paper → - 0653/63 · May/June 2025 · Q1a(viii)[1]
State one factor that is kept constant for all five flasks in this investigation. (viii)
See it on the paper → - 0653/63 · May/June 2025 · Q1b[1]
As seeds germinate they produce reducing sugars. State the reagent used to confirm the presence of reducing sugars.
See it on the paper → - 0653/63 · May/June 2025 · Q2a[1]
The student adds a sample of H to aqueous sodium hydroxide in a boiling tube. The student carefully warms the boiling tube. The student concludes that H contains the ammonium ion. Describe the observations the student makes to form this conclusion.
See it on the paper → - 0653/63 · May/June 2025 · Q2b[1]
The student adds a sample of H to dilute hydrochloric acid. The student concludes that H contains the carbonate ion. Describe the observations the student makes to form this conclusion.
See it on the paper → - 0653/63 · May/June 2025 · Q2c(i)[1]
Explain why the student uses a blue Bunsen burner flame rather than a yellow flame.
See it on the paper → - 0653/63 · May/June 2025 · Q2c(ii)[1]
The total mass of the test-tube and H before heating is 15.7 g. Fig. 2.1 shows the reading on the balance after heating for two minutes. 13.97 g Fig. 2.1 State the total mass of the test-tube and its contents after heating for two minutes. Give your answer to one decimal place. mass after heating = g
See it on the paper → - 0653/43 · May/June 2024 · Q6c(iii)[1]
The total distance between the bus stops is 2.65 km. Use your answer to (c)(ii) to find the distance in metres travelled by the bus while it is decelerating. distance = m
See it on the paper → - 0653/61 · May/June 2024 · Q1avi[1]
Calculate the difference in volume of the solution in test-tube A and the solution in test-tube C at the end of step 5. Use the information from steps 3, 4 and 5.
See it on the paper → - 0653/61 · May/June 2024 · Q1avii[1]
The difference in volume of solution you calculated in (a)(vi) identifies a limitation in this investigation. Suggest a change to the procedure that removes this limitation.
See it on the paper →
What examiners said
Some candidates gained partial credit for calculating the ratio of image size to magnification. Only a few candidates completed the unit conversion to give an answer in micrometres.
— Examiner report, May/June 2025, 0653/43 Q1(b)(ii) (Cambridge)
Candidates needed to recognise the structure in the diagram as a bronchiole. Many referred to bronchus, bronchi and alveoli.
— Examiner report, May/June 2025, 0653/43 Q3(a)(i) (Cambridge)
Many candidates calculated the percentage of germinated seeds in flask B correctly. A correct calculation from incorrect values in 1(a)(i) was also credited.
— Examiner report, May/June 2025, 0653/63 Q1(a)(ii) (Cambridge)
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