plumiHomeostasis in plants: CAIE A‑Level Biology questions
Every CAIE A-Level Biology exam question on 14.2 Homeostasis in plants, June 2024 and the specimen papers, with its mark scheme and examiner’s report.
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Q3(a)
The whole paper ↗![June 2024 Paper 4, question 3(a): Describe the mechanism by which stomata open in sunlight. [4]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/970041-jun24-03-a-qp.webp)
Q3(b)(i)
The whole paper ↗![June 2024 Paper 4, question 3(b)(i): With reference to Fig. 3.1, describe the relationship between the concentration of ABA in the xylem sap and stomatal conductance. [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/970041-jun24-03-bi-qp.webp)
Q3(b)(ii)
The whole paper ↗![June 2024 Paper 4, question 3(b)(ii): Suggest explanations for the results shown in Fig. 3.1. [4]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/970041-jun24-03-bii-qp.webp)
Q2(a)
The whole paper ↗
Q2(b)
The whole paper ↗![June 2024 Paper 5, question 2(b): Using Fig. 2.1, state the effect of a high mean temperature on the mean stomatal conductance of young trees that were given a good supply of water. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/970051-jun24-02-b-qp.webp)
Q2(c)
The whole paper ↗
All 6 questions on Homeostasis in plants, as a list
- June 2024, Paper 4, Q3(a) (4 marks): Describe the mechanism by which stomata open in sunlight. [4]
- June 2024, Paper 4, Q3(b)(i) (2 marks): With reference to Fig. 3.1, describe the relationship between the concentration of ABA in the xylem sap and stomatal conductance. [2]
- June 2024, Paper 4, Q3(b)(ii) (4 marks): Suggest explanations for the results shown in Fig. 3.1. [4]
- June 2024, Paper 5, Q2(a) (3 marks): State three environmental conditions in the glasshouse that should be standardised in the 10-week period of acclimatisation, other than the temperature of the g
- June 2024, Paper 5, Q2(b) (1 mark): Using Fig. 2.1, state the effect of a high mean temperature on the mean stomatal conductance of young trees that were given a good supply of water. [1]
- June 2024, Paper 5, Q2(c) (4 marks): The biologist then compared the young trees from group 3 and group 4 that were exposed to water stress. The biologist carried out statistical tests on the data
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