The newest 7 of 7 written questions. Open one to see it on the real paper.
Explain the result for the piece of carrot immersed in the 0.0 mol per dm 3 salt solution (pure water). Use ideas about water potential in your answer.
See it on the paper →Identify the salt solution with the same water potential as red blood cells. g / dm 3 (i)
See it on the paper →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 →Suggest which sugar solution has the same concentration as the cells inside the potato.
See it on the paper →Use Table 1.1 to suggest the concentration of sugar solution inside the cells of the potato. mol dm –3
See it on the paper →Explain why the potato strip immersed in a 0.2 mol dm –3 sugar solution increased in length by completing the sentences. The potato strip has a water potential than the sugar solution. Water moves into the potato strip by , from an area of water potential to water potential through the membrane.
See it on the paper →State the term used for the property of water molecules that enables them to be drawn up the xylem during transpiration.
See it on the paper →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, 0654/41 Q10(a) (Cambridge)
Only some candidates correctly identified the concentration of sugar solution inside the cells as being the value for which the change in length would be zero. A few candidates incorrectly identified this value as either 0.6 or 0.8 mol dm–3.
— Examiner report, October/November 2021, 0654/43 Q1(b) (Cambridge)
A large number of candidates were able to correctly identify osmosis as the process by which water moves into the potato strip. Many incorrectly identified the water potential inside the potato as being lower than the sugar solution. Many candidates described water moving through a cell membrane rather than a semi-permeable membrane and credit was given for the use of the word cell.
— Examiner report, October/November 2021, 0654/43 Q1(c) (Cambridge)
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