Question 1
Triple only (what this means)
Triple only: only in Triple Biology. Combined Science students can skip it. What the labels meanWhich describes the response of a root to gravity?
- Positive phototropism
- Negative gravitropism
- Positive gravitropism
- Negative phototropism
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Answer: C
Question 2
Triple only (what this means)
Triple only: only in Triple Biology. Combined Science students can skip it. What the labels meanA shoot is lit from one side. Explain how auxin makes the shoot bend towards the light. (3)
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- auxin moves to the shaded side (1)
- auxin makes the cells on the shaded side elongate / grow faster (1)
- so the shoot bends towards the light (1)
Question 3
Triple only (what this means)
Triple only: only in Triple Biology. Combined Science students can skip it. What the labels meanA seedling root is placed on its side. Describe how the root responds to gravity. (2)
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- root grows downwards / bends towards gravity (1)
- auxin collects on the lower side and slows the growth of cells there (1)
Question 4
Triple only (what this means)
Triple only: only in Triple Biology. Combined Science students can skip it. What the labels meanHigher tier (what this means)
Higher tier: only on the Higher tier papers. Foundation students can skip it. What the labels meanGive one commercial use of each of the following plant hormones. (a) Auxins (1) (b) Gibberellins (1) (c) Ethene (1)
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- auxins: weedkiller / rooting powder (1)
- gibberellins: any one of germination of seeds / fruit and flower formation / production of seedless fruit (1)
- ethene: ripening of fruit (1)
Question 5
Triple only (what this means)
Triple only: only in Triple Biology. Combined Science students can skip it. What the labels meanHigher tier (what this means)
Higher tier: only on the Higher tier papers. Foundation students can skip it. What the labels meanBananas are picked while green and transported in cool containers. Explain why growers expose them to ethene before they are sold. (2)
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- ethene makes the fruit ripen (1)
- so all the fruit is ripe at the same time / ripens when it is needed in the shops (1) allow so it does not spoil during transport