Transpiration

Biology (Science Paper 3) · Chapter 4 · 2. Plant Physiology

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Your path through this chapter

1
Visual lesson Beta
1. Part 1: The process, stomata and experiments14 slides
2. Part 2: Potometer, factors, guttation14 slides
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Notes Beta
6 sections with key terms, formulas and exam tips.
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Flashcards Beta
30 cards for quick recall of key terms and facts.
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Practice
65 board-style questions with instant checks: Multiple choice 25, Short answer 19, Assertion and reason 7, Case-based 6.
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Chapter test Free
Short and long chapter tests in board pattern, with results and analysis.
- Chapter test (long) — Transpiration · 40 marks · 60 min
- Chapter test (short) — Transpiration · 20 marks · 30 min
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Transpiration: the process and its importance to plants
Mechanism of stomatal opening and closing: potassium ion exchange theory
Experiments: loss of weight of a potted plant or leafy shoot; bell jar; cobalt chloride paper on a dorsiventral leaf
Ganong's potometer: measuring water uptake and its limitations
Factors affecting the rate of transpiration; adaptations to reduce it
Guttation and bleeding