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Romeo and gerald
 

Romeo and gerald

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    Romeo and gerald Romeo and gerald Presentation Transcript

    •  A stem is a collection of integrated tissues arranged as nodes and internodes. Nodes are regions where leaves attach to the stem. Internodes are the parts of the stem inbetween the nodes.
    •  Stems support the leaves. Leaves are supported by a stem’s internal skeleton of collenchyma and schlerenchyma. turgor pressure in stems provides a hydrostatic skeleton that supports the young plant.
    •  Stems produce the carbohydrates. Stems of some plants are photosynthetic. Although it is insignificant compared to those produced by the leaves, in plants such as cacti it accounts for most of the plants CO2 fixation.
    •  Stems store materials. Parenchyma cells in stems store a large amount of starch and water. For example, water accounts for as much as 98% of weight in cacti syems.
    •  Stems transport water and solutes between roots & leaves. Stems link leaves with the water and dissolved nutrients of the soil. The vascular sytems of stems maintains an aquatic environment in leaves and transports sugars and other solutes between leaves and roots.