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Published byAshlynn Stevenson Modified over 8 years ago
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VASCULAR PLANTS The largest group in the Plant Kingdom
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Have a well- developed system for transporting water and food Have true roots Have stems Have leaves
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Have tube-like structures that provide support and help circulate water and food throughout the plant.
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● Xylem transport water and minerals from the roots to the rest of the plant. ● Phloem transport food from the leaves to the rest of the plant.
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Examples include trees and many shrubs with woody stems that grow very tall and grasses, dandelions, and tomato plants with soft stems.
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Plants can be 300’ tall and parts can be distant from water source
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Basic structure of the xylem and phloem
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Basic structure of xylem & phloem
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Adhesion/cohesion of water in the xylem tissue
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● Transpiration from leaves as the driving force for water going up
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DIFFUSION Diffusion is the movement of particles (atoms, ions or molecules) from a region in which they are in higher concentration to regions of lower concentration. A good example of diffusion is food colouring. If you place a drop of red food colouring in a beaker of water eventually the entire beaker of water will have a red tint. The food colouring moved through the water until it was equally distributed throughout the beaker. Diffusion takes place along a concentration gradient. A concentration gradient exists until the diffused substance is evenly distributed.
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Diffusion
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OSMOSIS Osmosis is a special example of diffusion. It is the diffusion of a substance through a semipermeable membrane from a more dilute solution to a more concentrated solution. This process is also passive since no external energy is needed.
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Osmosis in plants
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*Carbon dioxide entering the stomata of leaves. * Oxygen diffusing out of the stomata and lenticels of leaves.
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Diffusion of water from environment to roots
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