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ICSE BIOLOGY TRANSPIRATION NOTES

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Tanay Nayak
Avalon Heights International School, Mumbai

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DishaEducentre Biology for X ICSE Exhaustive Notes ~ 1 ~~ 1 ~ 4. Transpiration DishaEducentre Exhaustive Notes TRANSPIRATION Scope of Syllabus: Mechanism of stomatal transpiration must be explained so that the concept of the process is clear. Adaptations in plants to reduce transpiration to be discussed. A brief idea of guttation and bleeding should be given. I. Definitions and Explanations 1. Transpiration 2. Potometer 3. Stomatal Transpiration 4. Cuticular Transpiration 5. Cuticle 6. Lenticular Transpiration 7. Lenticels 8. Guttation 9. Hydathode 10.Bleeding 11.Antitranspirants II. The evaporative loss of water in the form of water vapour from the aerial parts of the plants is known as transpiration. A potometer is a device that measures the rate of water intake by a plant. (Latin: poton means to drink and meter means to measure ) The loss of water which takes place though the stomatal openings on the leaves of plants is known as stomatal transpiration. The loss of water which takes place directly through the surface of the leaves and stems is known as cuticular transpiration. Cuticle is a waxy layer present on the underside of some leaves to prevent transpiration. The loss of water which takes place from the lenticels, which are minute openings on the surface of stems of old plants, is known as lenticular transpiration. Lenticels are minute openings on the bark and root of old trees. Guttation is the loss of water in the form of droplets of water along the leaf margins of certain plants. Hydathodes are pore-bearing structure present along the margins of leaves of some plants through which guttation takes place. The escape of plant sap from the ruptured surfaces of a plant is known as bleeding. Substances that are applied to plants to control their loss of water through transpiration are known as anti-transpirants. Example: silica gel. Questions-Answers Describe an experiment to demonstrate transpiration by polythene bag method. ANSWER Aim: To demonstrate transpiration in plants. Procedure: A medium-sized well-watered plant is taken. It is covered with a transparent polythene bag with its mouth tied up quite securely. The plant is kept in sunlight for 1-2 hours. 1. Notes Prepared by Neil Valentine D SilvaNotes Prepared by Neil Valentine D Silva

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Additional Info : ICSE Biology Notes by Bhomik Acharya (bhomik1018)
Tags : Icse bio transpiration, ICSE Notes and Tips.

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