O-LevelBiologyPlant Nutrition5090/21 · Oct/Nov 2014 · Q110 Marks
Fig. 1.1 shows a section through a plant organ with a very small pipette (micropipette) inserted into tissue A. [Figure 1.1]
- (a)(i)Name the plant organ shown in Fig. 1.1.[1]
- (a)(ii)Name the tissue labelled A.[1]
- (b)The micropipette is used to take samples from tissue A at regular intervals over a 24-hour period. These samples are then analysed for their content. Explain how this might provide information about the rate of photosynthesis in the plant.[4]
- (c)Some insects have mouthparts similar to the tube of the micropipette. Suggest reasons for these insects using tissue A to supply their food.[4]
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 2014). The mark or mark type is shown in brackets.
- [1] stem;
- [1] phloem ;
- [max. 4] (photosynthesis) produces glucose/sugar/starch/carbohydrates ;
- [max. 4] changed into sucrose ;
- [max. 4] passes down the phloem/tissue A;
- [max. 4] concentration (of sucrose) varies ;
- [max. 4] highest when photosynthesis rate is highest / AW ;
- [max. 4] (sucrose/sugar turned to) glucose ;
- [max. 4] used for respiration ;
- [max. 4] to release energy ;
- [max. 4] amino acids ;
- [max. 4] used to make protein ;
- [max. 4] for growth / repair ;
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