(a) Structures, processes and compounds involved in photosynthesis in C4 plants include: A - carbon dioxide B - phosphorylation C - palisade cells D - PEP carboxylase E - rubisco F - malate G - RuBP H - mesophyll cells I - guard cells J – photorespiration K - photolysis L - oxaloacetate M - ATP synthase N - chlorophyll Complete Table 7.1 by matching each description with one letter chosen from A to N to show the correct structure, process or compound. You may use each number once, more than once or not at all. [Table 7.1]
- (a)Structures, processes and compounds involved in photosynthesis in C4 plants include: A - carbon dioxide B - phosphorylation C - palisade cells D - PEP carboxylase E - rubisco F - malate G - RuBP H - mesophyll cells I - guard cells J – photorespiration K - photolysis L - oxaloacetate M - ATP synthase N - chlorophyll Complete Table 7.1 by matching each description with one letter chosen from A to N to show the correct structure, process or compound. You may use each number once, more than once or not at all. [Table 7.1][5]
- (b)Some plants, such as rice, are adapted to grow when partially submerged in water. Describe and explain the adaptations that allow rice plants to survive in waterlogged fields.[3]
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 (May/June 2020). The mark or mark type is shown in brackets.
- [1] enzyme with a high optimum temperature D;
- [1] enzyme in bundle sheath cells E;
- [1] process that slows down the rate of photosynthesis J;
- [1] compound that releases carbon dioxide into bundle sheath cells F;
- [1] cells that stop oxygen reaching bundle sheath cells H;
- [1] aerenchyma so oxygen can reach submerged, parts / roots ;
- [1] ridges on underwater leaves to hold air close to, leaf surface / stomata ;
- [1] grow taller to keep leaves and flowers above water level;
- [1] high tolerance to ethanol so roots can respire anaerobically;
- [1] produce more ethanol dehydrogenase to breakdown ethanol from anaerobic respiration;
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →