A-LevelBiologyPhotosynthesis9700/41 · May/June 2018 · Q79 Marks

7 (a) Fig. 7.1 outlines the process of non-cyclic photophosphorylation in the chloroplast of a leaf mesophyll cell. [Figure 7.1]

(a)(i)State precisely where non-cyclic photophosphorylation occurs in the chloroplast.[1]
(a)(ii)With reference to Fig. 7.1, name processes A and B. A B[2]
(a)(iii)State what happens to the oxygen produced by process A.[1]
(a)(iv)Name the primary pigment in photosystem I and photosystem II.[1]
(a)(v)Name two compounds shown in Fig. 7.1 that are used in the conversion of glycerate-3-phosphate (GP) to triose phosphate (TP) in the Calvin cycle.[1]
(b)Outline the uses of triose phosphate in the mesophyll cells of the leaf.[3]

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Mark scheme

Marking points from the official mark scheme (May/June 2018). The mark or mark type is shown in brackets.

[1] thylakoid (membranes) / lamellae / granum / grana ;
[2] A photolysis (of water) ; B chemiosmosis / (cyclic) photophosphorylation ;
[1] any one of: diffuses out/lost / expelled / released, from, leaf / stomata / plant ; used in, (aerobic) respiration / oxidative phosphorylation ;
[1] chlorophyll a;
[1] ATP and reduced NADP / NADPH;
[3] any three from: regenerate / produce / make/ form, RuBP ; (triose phosphate / glucose / acetyl coA) for respiration; to make any two of: glucose / sucrose / ribose / deoxyribose / glycerol / acetyl (coA) / fatty acids / amino acids starch / cellulose ; ;

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