O-LevelBiologyPlant Nutrition5090/21 · May/June 2016 · Q212 Marks
Dry mass is the mass of all chemicals, excluding water, present in an organism. Fig. 2.1 shows the stages of germination of a seed. Fig. 2.1 also shows the changes in dry mass of the plant during these stages of germination. [Figure 2.1]
- (a)Name the parts labelled D and E in Fig. 2.1. D E[2]
- (b)Describe and explain the changes in dry mass shown during each of the stages A, B and C in Fig. 2.1. stage A stage B stage C[6]
- (c)Water is needed for germination of seeds. State two other conditions needed for germination. Explain why each condition is needed. condition explanation condition explanation[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 (May/June 2016). The mark or mark type is shown in brackets.
- [2] radicle/root;
- testa/seed coat;
- [max 6] stage A: decreases;
- stage B: decreases;
- explanation for A/B: food store used;
- reference to respiration;
- reference to enzyme/named enzyme action ;
- stage C: increases;
- explanation for C: reference to photosynthesis ;
- reference to production of named food compound;
- reference to more cells made/tissue growth ;
- [max 4] oxygen;
- reference to respiration;
- energy + for growth;
- suitable/correct temperature ;
- reference to enzyme ;
- breaks down food store AW ;
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