Plant Structur11 - depending on the availability of...

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Plant Structures Introduction and Summary Plant stems (or trunks, as they are called in trees) function primarily to transport nutrients and provide physical support. Transport is achieved through the vascular system (composed of xylem and phloem), which carries water, minerals, and the products of photosynthesis all over the plant body. The tissues within the stems of monocots and dicots are arranged differently, with discrete vascular bundles in monocots and continuous rings of vascular tissue in many dicots. The leaves of the plant contain chlorophyll and are the major sites of photosynthesis. Because of this important function, leaves are the site of gas exchange in plants, and small pores (stomata) on the surface of the leaf allow carbon dioxide in and oxygen (a byproduct of photosynthesis) out into the surrounding air. These stomata are regulated by guard cells, which open and close
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Unformatted text preview: depending on the availability of moisture in the environment and protect the plant from losing too much water from evaporation (a phenomenon called transpiration). Flowers contain the reproductive organs of angiosperms. Each flower is composed of four whorls, each of which contains one of the main structures of the flower. The calyx contains the sepals and the corolla contains the petals; together, the calyx and corolla comprise the perianth, or non- reproductive portion of the flower. The androecium contains the stamens. Stamens, the male reproductive organs, each contain an anther (pollen-production site) and filament. The gynoecium, at the very center of the flower, contains the pistils (sometimes called the carpels), the female reproductive organs. Each pistil is made up of a stigma, style, and ovary....
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