O-LevelBiologyPlant Nutrition5090/22 · Oct/Nov 2020 · Q110 Marks
The flow chart shows stages in the life cycle of a flowering plant. [Figure 1.1: Flowchart showing stages 1-6 of a flowering plant life cycle. Stage 1: pollination, Stage 2: pollen tube formation and fertilisation, Stage 3: fruit and seed formation, Stage 4: fruit and seed dispersal, Stage 5: (blank), Stage 6: plant growth and flower formation]
- (a)The name of stage 5 of the life cycle has not been included in the flow chart. During this stage a radicle and a plumule are formed from a seed.
- (a)(i)State, in the correct place on the flow chart, the name of stage 5.[1]
- (a)(ii)Describe the role of enzymes in this stage of the plant's life cycle.[3]
- (b)Two of the stages in the life cycle of this flowering plant may depend on the action of an animal. Identify each of these stages and for each stage describe how the action of an animal may be required.[6]
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 2020). The mark or mark type is shown in brackets.
- [1] germination ;
- [1] break down AW / digest / hydrolyse ;
- [1] amylase / maltase / lipase / other named digestive enzyme ;
- [1] named substrate + named product;
- [1] respiration / protein synthesis ;
- [1] (stage) 1/one / pollination;
- [1] pollen + movement /attachment;
- [1] from anther + to stigma;
- [1] of different flowers ;
- [1] (stage) 4 /four / fruit dispersal / seed dispersal ;
- [1] eats / consumes / undigested / attachment AW;
- [1] movement AW ;
- [1] egestion / faeces / removal AW (e.g. falls off / spat out/thrown) ;
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