O-LevelBiologyTransport in Plants5090/21 · Oct/Nov 2015 · Q510 Marks
Fig. 5.1 shows a plant growing in an area of well-watered soil. [Figure 5.1]
- (a)The plant was held by the stem and pulled from the ground before being re-planted in another area of well-watered soil. It was observed that the plant wilted for several days after being re-planted and then recovered its original appearance. Suggest an explanation for this observation.[4]
- (b)Photosynthesis takes place in the leaves of the plant. Complete the equation below for photosynthesis using either words or symbols. + → + Glucose (C6H12O6)[1]
- (c)(i)Name the parts labelled P, Q and R in Fig. 5.2. P Q R[3]
- (c)(ii)Suggest how the upper surface of the same leaf would appear different from the lower surface shown in Fig. 5.2 when viewed using a microscope. Explain the reason for this difference.[2]
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. 4] (a) wilting: root hairs removed/roots damaged ;
- [max. 4] (a) stem/xylem damaged ;
- [max. 4] (a) less water absorbed;
- [max. 4] (a) plant loses water/transpires ;
- [max. 4] (a) cells lose water/cells become flaccid;
- [max. 4] (a) recovery: root (hairs) regrow ;
- [max. 4] (a) (more) water absorbed ;
- [max. 4] (a) cells gain water again/become turgid ;
- [1] (b) carbon dioxide + water → oxygen;
- [3] (c) (i) P = (lower) epidermal cell/epidermis/epidermal layer;
- [3] (c) (i) Q = guard cell ;
- [3] (c) (i) R = stoma/stomata;
- [max. 2] (c) (ii) fewer/no stomata/guard cells ;
- [max. 2] (c) (ii) reduce/stop water loss/transpiration;
- [max. 2] (c) (ii) (appears) shiny/bright/ref. to cuticle ;
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