O-LevelBiologyTransport in Plants5090/22 · Oct/Nov 2015 · Q710 Marks
Explain how wilting occurs in a plant.
- (a)(i)Explain how wilting occurs in a plant.[4]
- (a)(ii)Explain why mature plants do not wilt as much as newly-transplanted seedlings, even when both are exposed to similar conditions.[3]
- (b)Suggest an explanation for what would happen to a plant if it is accidentally ‘watered' with a concentrated salt solution.[3]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2015). The mark or mark type is shown in brackets.
- [max 4] water lost/plant dehydrated; by transpiration/evaporation/through stomata ; faster than it is gained; cells/tissues lose turgor/become flaccid/plasmolysed AW ; no longer support plant ; any condition leading to wilting ;
- [max 3] root system undamaged ORA ; ref. root hairs; water uptake sufficient for plant ORA ; plant cells/tissues turgid ORA ; xylem supports older plants/ref. lignin;
- [max 3] plant/leaves will wilt ; water lost; from cells/tissues; by osmosis/diffusion ; lower water potential in soil water/ref. correct water potential gradient AW;
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