Seed Plants |
seed plants |
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plants reproduce by producing seeds.
The seed-plants all create pollen, which is dispersed by wind or animals, to fertilize the female egg. Each resulting seed contains all the genetic information needed to produce a new plant. If the seed is lucky enough to find its way to new ground, with plenty of water and nutrients, it will grow into a whole new plant. Seed-plants have a body which is divided into sections of root, stem and leaf. They also contain vessels which allow movement of fluids, carrying water and nutrients to the different plants of the plant. The plant tissue containing vessels is known as vascular tissue. The seed-bearing plants are also known as "Spermatophytes". There are 2 main groups of Seed Plants: |
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Angiosperms (sounds like "Anj-io-sperms") are the true "Flowering Plants" and include Oak trees, Buttercups and Grass. The word "Angiosperm" means "covered seed" (Greek angeion = vessel). This is because the female eggs (ovules) are enclosed in a protective ovary. These plants have complex flowers, which contain male and female organs. After fertilisation, seeds are produced enclosed within a fruit.
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Gymnosperms (sounds like "Jim-no-sperms") means "naked seed" (Greek gumnos = naked). This is because the seeds do not develop enclosed within an ovary but are usually exposed on the surfaces of reproductive structures, such as cones. This group includes all the conifers, such as pines and firs. The leaves of many gymnosperms are adapted to water conservation in having a thick cuticle. Many leaves are needle-like. Many gymnosperms are evergreen. |
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