0654.B3.2.04 — Explain the importance of water potential and osmosis in the uptake and loss of water by organisms: past paper questions
Real questions on 0654.b3.2.04 — explain the importance of water potential and osmosis in the uptake and loss of water by organisms
The newest 8 of 8 written questions. Open one to see it on the real paper.
- 0973/41 · October/November 2024 · Q7a(ii)[1]
Identify the concentration of sucrose solution in Table 7.1 that results in the smallest water potential gradient. concentration = mol / dm 3
See it on the paper → - 0973/41 · October/November 2024 · Q7a(iii)[1]
Identify the concentration of sucrose solution in Table 7.1 that results in the potato cells with the greatest turgor pressure. concentration = mol / dm 3
See it on the paper → - 0973/42 · May/June 2024 · Q10b(i)[1]
Identify the salt solution with the same water potential as red blood cells. g / dm 3
See it on the paper → - 0973/31 · May/June 2023 · Q4b(ii)[2]
Water is needed for germination of seeds. State two other environmental conditions required for germination.
See it on the paper → - 0973/41 · May/June 2023 · Q10a[3]
Complete the sentences to explain the appearance of cell A in Fig. 10.1. The concentrated salt solution has a lower than cell A. Water crosses the and leaves the cell by osmosis. Water molecules move from a more solution to a more solution.
See it on the paper → - 0973/32 · May/June 2021 · Q7a(ii)[2]
Suggest which beaker contains the solution with the same concentration as the plant cells. Give a reason for your answer. beaker
See it on the paper → - 0973/41 · October/November 2020 · Q4a[3]
A student investigates what effect immersing grapes in distilled water and concentrated salt solution has on the mass of the grapes. The student measures the mass of a grape before and after immersion. The results are shown in Table 4.1. Table 4.1 mass before immersion / g mass after immersion / g percentage change in...
See it on the paper → - 0973/41 · October/November 2020 · Q4b[1]
The student repeated the investigation by immersing a grape in 100% pure grape juice. This time there was no change in mass. Suggest why there was no change in mass.
See it on the paper →
What examiners said
Some candidates knew that oxygen was required for germination. Some also knew that warmth or a suitable temperature was also needed. Temperature, on its own, was not accepted.
— Examiner report, May/June 2023, 0973/31 Q4(b)(ii) (Cambridge)
Most candidates correctly identified the membrane. Some correctly stated water potential. Many got dilute and concentrated the wrong way round.
— Examiner report, May/June 2023, 0973/41 Q10(a) (Cambridge)
There were some good explanations for the increased mass of the grape in terms of the movement of water by osmosis down a water potential gradient. The use of the concept of water concentration was not accepted.
— Examiner report, October/November 2020, 0973/41 Q4(a) (Cambridge)
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