QUESTIONS
(3)
(2)
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QUESTIONS |
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| 1. | The drawing shows a 24-hour cycle for the opening and closing of stomata from the same plant. | ||
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| (a) | Explain how this opening and closing of stomata is adventageous to the plant. | ||
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(2) | ||
| The diagram shows the potassium (K+) ion concentrations in the cells around an open and closed stoma in Commelina. The concentrations are in arbitrary units. | |||
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| (b) | Explain how the movement of K+ ions accounts for the opening of the stoma. | ||
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(3) |
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| (c) | Explain how K+ ions are moved against a concentration gradient. | ||
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(2) |
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NEAB 1998