Cambridge AS & A Level Biology
14.2Homeostasis in plants
Homeostasis in plants in Cambridge AS & A Level Biology: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic20 practice questions1 lesson
Learning objectives
What the syllabus expects you to be able to do.
- 14.2.1Explain how stomatal opening and closing balances carbon dioxide uptake against water loss.
- 14.2.2Explain that stomata have daily rhythms of opening and closing.
- 14.2.3Describe guard cells and explain how they open and close stomata.
- 14.2.4Describe the role of abscisic acid and calcium ions in closing stomata under water stress.
Lessons
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Stomata, guard cells and abscisic acid
35 min
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Sample question
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