A-LevelBiologyPhotosynthesis9700/42 · Feb/Mar 2020 · Q78 Marks

Fig. 7.1 outlines some of the events in the process of photosynthesis in a chloroplast. water site 1 light dependent stage B C A site 2 D light independent stage triose phosphate [Figure 7.1]

(a)Name the parts of a chloroplast labelled site 1 and site 2 in Fig. 7.1. site 1 site 2[2]
(b)Name the substances labelled A, B, C and D in Fig. 7.1. The substances labelled B and C may be named in either order. A B C D[3]
(c)Most of the triose phosphate produced in the light independent stage is used to regenerate RuBP so that the Calvin cycle can continue. Some of the triose phosphate is used to make other organic compounds with a range of functions. State three different functions of these other organic compounds in a plant cell and give one example of an organic compound for each function. function compound function compound function compound[3]

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Mark scheme

Marking points from the official mark scheme (Feb/Mar 2020). The mark or mark type is shown in brackets.

[2] 7(a) site 1 – thylakoid / granum ; site 2 – stroma;
[3] 7(b) A – oxygen; B – reduced NADP/ATP; C – reduced NADP/ATP; D – carbon dioxide; B and C must be different 4 correct = 3 marks 3 correct = 2 marks 1 or 2 correct = 1 mark
[3] 7(c) any three from: 1 cell wall (production / support) and cellulose; 2 respiration and named, monosaccharide / disaccharide; 3 energy store and fatty acids / lipids / starch; 4 protein synthesis and amino acids ; 5 AVP; e.g. storing genetic information and nucleic acids / nucleotides use of lipids in cell surface membrane

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