Plant-and-Animal-Systems.docx - PLANTS REGULATION OF BODY...

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PLANTS: REGULATION OF BODY FLUIDS Plants are distributed in different habitats. These habitat may be: Aquatic Moderate Severely dry T errestrial . Plants are therefore divided into three groups based on the nature of habitat. Hydrophytes Mesophytes Xerophytes 1. Hydrophytes - The aquatic plants - They have the adaptation to save themselves from excessive water in fresh water environment. - These plants have large surface area . - Ex. Red lotus flower 2. Mesophytes - living in the moderate environment . - These plants have moderate water availability . - Ex. Gentian Flower 3. Xerophytes - plants living in the severely dry terrestrial environment. - They have the following adaptation to reduce the rate of transpiration. - Ex. Cactus Adaptation to Reduce the Rate of Transpiration a. posses small thick leaves. - It reduces the surface area to volume of the plants. b . thick, waxy and leathery cuticle. c. stomata are on the lower surface of the leaves. - These stomata are present in depressions . d. cacti - shed their leaves during the dry seasons. IN PLANTS : Water Most important fluid Needed by the plants to survive. Used in photolysis , a photochemical process that allows molecules to split in the presence of light. Different Ways of regulating the amount of water: 1. Osmosis - the tendency of water to pass through semi permeable membrane of plant cells. - Low solute concentration to high solute concentration. 2. Transpiration - the process wherein water exits the plants through the stomata of the leaves because of evaporation. 3. Adhesion-Cohesion Property of Matter - Allow the water to move up through a plant.
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