Plant Classificatio8 - system will be discussed in far more...

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Plant Classification Terrestrial plants, as noted above, are classified as bryophytes and tracheophytes. Bryophytes, such as mosses and liverworts, are still dependent on a moist environment for reproductive and nutritive functions even though they are technically "terrestrial." Bryophytes also have very little internal support, limiting the heights to which they can grow. As a phylum, Bryophytes, are lower on the evolutionary scale than tracheophytes, which have adapted completely to life on land. Tracheophytes (also known as vascular plants) possess well-developed vascular systems, which are comprised of tissues that form internal passageways through which water and dissolved nutrients can traverse the entire plant. Vascular plants are thus far less reliant on moist environments for survival. At the same time, Vascular systems also provide a strong system of support to the plant, allowing some tracheophytes to grow to immense heights. The vascular
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Unformatted text preview: system will be discussed in far more detail in Vascular Tissues. The tracheophytes can be further broken down into two kinds of seed-producing plants, gymnosperms (conifers) and angiosperms (flowering plants). The male gametes of gymnosperms and angiosperms are carried by pollen; each of these types of plants also produce seeds, which protect the embryos inside from drying out in a terrestrial environment. Angiosperms, with their flowers and fruits, have adapted even further to the terrestrial environment: flowers, by attracting insects and other pollen-bearing animals, aid in the transfer of pollen to female reproductive organs. Angiosperm fruits, developed from ovaries, protect the seeds and help in their dispersal. Finally, angiosperms themselves are divided into two classes--monocots and dicots--based on differences in embryonic development, root structure, flower petal arrangement, and other factors....
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