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Transpiration | Photosynthesis | Chemical Coordination in Plants Class 10 ICSE |‪@sirtarunrupani‬

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Syllabus:
(i) Transpiration - process and significance. Ganong’s potometer and its limitations. The factors affecting rate of transpiration. Experiments on transpiration. A brief idea of guttation and bleeding.
• Concept of transpiration and its importance to plants
• Experiments related to transpiration:
(a)Loss in weight of a potted plant or a leafy shoot in a test tube as a result
of transpiration.
(b)Use of cobalt chloride paper to demonstrate unequal rate of transpiration in a dorsiventral leaf.
• Mechanism of stomatal transpiration on the basis of potassium ion exchange
theory.
• Adaptations in plants to reduce transpiration.
• A brief idea of guttation and bleeding.

(ii) Photosynthesis: the process and its importance to life in general; experiments to
show the necessity of light, carbon dioxide, chlorophyll, formation of starch and release of oxygen; carbon cycle.
• The process and significance of Photosynthesis.
• The internal structure of chloroplast to be explained to give an idea of the site of
light and dark reactions.
• Opening and closing of stomata based on potassium ion exchange theory.
• Overall balanced chemical equation to represent photosynthesis.
• Introduction of the terms "photochemical" for light phase and "biosynthetic" for dark phases.
• Light reaction - activation of chlorophyll followed by photolysis of water, release
of O2, formation of ATP (photophosphorylation) and NADPH.
• Dark reaction - only combination of hydrogen released by NADP with CO2 to
form glucose. (detailed equations are not required).
• Adaptations in plants for photosynthesis.
• Experiments with regard to the factors essential for photosynthesis; emphasis on
destarching and the steps involved in starch test.
• A diagrammatic representation of “carbon cycle”.

(iii) Chemical coordination in Plants: A general study of plant growth regulators; Tropic movements in plants.
• A brief idea of the physiological effects of Auxins, Gibberellins, Cytokinins, Abscisic acid and Ethylene in regulating the growth of plants.
• A basic understanding of the tropic movements in plants with reference to – Phototropism, Geotropism, Hydrotropism, Thigmotropism and Chemotropism (supported with suitable examples).













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