O-LevelBiologyCell Biology5090/21 · Oct/Nov 2015 · Q16 Marks
Fig. 1.1 shows a plant cell before and after being placed in a concentrated salt solution. before after [Figure 1.1]
- (a)With reference to named parts of the cell, describe changes in the appearance of the cell after being placed in the concentrated salt solution.[3]
- (b)Explain how the changes you have described in (a) have occurred.[3]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2015). The mark or mark type is shown in brackets.
- [max. 3] (a) (cell) membrane/cytoplasm/nucleus ;
- [max. 3] (a) pulled/moved away from (cell) wall/plasmolysed ;
- [max. 3] (a) vacuole ;
- [max. 3] (a) reduced in size/smaller/AW;
- [max. 3] (b) ref. direction of water potential/concentration gradient/AW;
- [max. 3] (b) osmosis/diffusion ;
- [max. 3] (b) (movement of) water out of cells ;
- [max. 3] (b) ref. partial permeability AW of (cell) membrane ;
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