Characteristics of Plant1 - photosynthesis in their leaves...

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Characteristics of Plants Prevention of Water Loss Plants share other structural qualities as well, most of which stem from their adaptation to terrestrial conditions. All plants have reproductive structures that prevent desiccation (drying out) of the gametes. These sex organs, called antheridia (male) and archegonia (female), are themselves covered by a layer of jacket cells that help to retain moisture. In addition to the protection given to the sex organs, the plant surfaces exposed to air are covered in a waxy layer, called a cuticle, that guards against water loss. Gas exchange in plants is limited to pores in the leaf epidermis called stomata, which can open and close to prevent excessive evaporation of water into the environment. Autotrophism Most plants are autotrophs, organisms that synthesize all their own organic nutrients and do not rely on other organisms for food. The reason that plants are autotrophic is that they carry out
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Unformatted text preview: photosynthesis in their leaves. In the process of photosynthesis, the plant converts water, carbon dioxide, and light energy into oxygen, sugars, and more water. The oxygen is released into the surrounding air through the stomata, and the sugars (organic nutrients) are transported throughout the plant body to areas of growth and storage. Alternation of Generations Finally, plants undergo a life cycle that takes them through both haploid and diploid generations. The multicellular diploid plant structure is called the sporophyte, which produces spores through meiotic division. The multicellular haploid plant structure is called the gametophyte, which is formed from the spore and give rise to the haploid gametes. The fluctuation between these diploid and haploid stages that occurs in plants is called the alternation of generations. For further discussion, see Life Cycle, Alternation of Generations ....
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