(a)[3]
Explain why stomata have to open and close in line with environmental conditions.
(b)[6]
Describe the mechanism in guard cells that causes a stoma to open.
Biology 9700 · AS & A Level · Homeostasis in plants
Homeostasis in plants — practice question
In plants, stomata open or shut as environmental conditions vary.
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This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: “stomata open to allow $\u0001CO_2$ uptake during photosynthesis” …
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