Transpiration — Flashcards

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Transpiration is the loss of water vapours from aerial parts of a plant. It happens mainly through leaves, but also through stems, buds, and flowers. It is a physiological process carried out by livin…

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Leaves participate most actively in transpiration because they have many stomata, large surface area, and mesophyll cells with air spaces that allow water vapour to move out easily.

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Evaporation is a physical process in which water from water bodies changes into vapour. Transpiration is a physiological process in which water from a plant diffuses out as vapour through aerial parts…

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Transpiration occurs from plant parts and helps in the distribution of water and minerals. Perspiration occurs from the skin of mammals and causes a cooling effect. Transpiration is a physiological pr…

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Stomatal transpiration is the transpiration that occurs through stomata. Stomata are minute pores found in the epidermis of leaves and herbaceous stems, and they are more numerous on leaves.

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The stomatal aperture, guard cells, and subsidiary cells together constitute the stomatal apparatus. This structure controls the opening and closing of the stoma and helps regulate transpiration.

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Guard cells are two bean-shaped or kidney-shaped specialized epidermal cells surrounding each stoma. They contain chloroplasts, can carry out photosynthesis, and control the opening and closing of the…

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During daytime, guard cells carry out photosynthesis and produce sugars. This increases their osmotic pressure, so water enters by endosmosis and the guard cells become turgid. The outer wall is pushe…