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Transpiration

ICSE · Class 10 · Biology

Quick revision notes for Transpiration — ICSE Class 10 Biology. Key concepts, formulas, and definitions for last-minute revision.

42 questions40 flashcards5 concepts

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A comparison chart highlighting the key differences between transpiration, evaporation, and perspiration in terms of process type, speed, cellular involvement, and primary function.
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Key Topics to Revise

1

Meaning and Nature of Transpiration

  • Transpiration is the loss of water vapours from aerial parts of a plant.
  • It is a physiological process and is brought about by living cells.
  • Leaves participate most actively in transpiration.
2

Experiments to Demonstrate Transpiration

  • Bell jar method shows water droplets on the inner wall when a plant is kept inside a sealed bell jar in sunlight.
  • The joint between the bell jar and plate is sealed with vaseline, and the pot is covered with polythene to prevent outside water interference.
  • Polythene bag method shows water droplets on the underside of the bag when a leafy branch is enclosed in sunlight.
3

Measurement of Transpiration

  • The rate of transpiration can be measured directly by loss of weight of a leafy shoot.
  • Ganong's potometer measures the rate of transpiration by measuring the water taken up by a leafy shoot.
  • In Ganong's potometer, the narrow bent end is dipped in coloured water and an air bubble is introduced.
4

Types of Transpiration

  • Stomatal transpiration occurs through stomata.
  • Cuticular transpiration occurs through the cuticle.
  • Lenticular transpiration occurs through lenticels.

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Full Notes

Key Concepts

Transpiration is the loss of waterEvaporation is a physical processThere are three main typesStomata are minute pores foundGuard cells are bean

Frequently Asked Questions

What are the important topics in Transpiration for ICSE Class 10 Biology?
Key topics in Transpiration include Stomatal Opening vs Closing — The Correct Mechanism, Transpiration - Complete Chapter Concept Map, Overview of Transpiration — All Key Concepts. These are the concepts ICSE Class 10 examiners draw on most — study them first, then practise related questions.
How to score full marks in Transpiration — ICSE Class 10 Biology?
Understand the core concepts first, then work through the 42 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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