Gymnosperm naked seed

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In the European, or Scots, pine Pinus sylvestrisfor example, the female cones essentially collections of megasporophylls begin to develop in winter and are ready to receive pollen from the male cones in spring. During the first growing seasonthe pollen tube grows slowly through the nucellus, while within the ovule the megaspore nucleus, through a series of divisions, gives rise to a collection of some 2, nuclei, which are then individually enclosed by walls to form a structure called the female gametophyte or prothallus. The pollen tube ultimately penetrates the neck of one of the archegonia.

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Gymnosperms are seed plants adapted to life on land; thus, they are autotrophic, photosynthetic organisms that tend to conserve water. They have a vascular system used for the transportation of water and nutrients that includes roots, xylem, and phloem. This term comes from the fact that the ovules and seeds of gymnosperms develop on the scales of cones rather than in enclosed chambers called ovaries.

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Gymnosperms are flowerless plants that produce cones and seeds. The term gymnosperm literally means "naked seed," as gymnosperm seeds are not encased within an ovary. Rather, they sit exposed on the surface of leaf-like structures called bracts.

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Gymnospermany vascular plant that reproduces by means of an exposed seed, or ovule —unlike angiospermsor flowering plants, whose seeds are enclosed by mature ovaries, or fruits. Taxonomists recognize four distinct divisions of extant nonextinct gymnospermous plants— ConiferophytaCycadophytaGinkgophytaand Gnetophyta —with 88 genera and more than 1, species distributed throughout the world. Gymnosperms were dominant in the Mesozoic Era about

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The absence of an enclosing structure is believed to be primitive, thus the first seed plants were "gymnosperms. The derivation of the word "gymnosperm" means naked seeds and is from the Greek words gymno meaning naked or bare and sperm meaning seed. Fossil records indicate "gymnosperms" originated in the Paleozoic Era, during the middle Devonian Period about million years ago, and reached their greatest diversity during the Mesozoic Era, between 60 to million years ago.

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Evolutionary development of the seed. Seeds consist of an embryo already packaged within the seed, and nutritive tissue surrounded by a protective coat. A seed contains a well-developed multicellular young plant with embryonic root, stem, and leaves already formed, whereas a plant spore is a single cell.

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Gymnosperms Gymnospermae is the name for a group of seed -bearing and thus vascular plants whose seeds are formed "naked" on the scales of a cone-like structure, unlike the angiosperms whose seeds are formed in an ovule that is enclosed and that develops into a fruit. The term gymnosperm comes from the Greek word gumnospermos, literally meaning "naked seed. The production of seeds distinguishes the gymnosperms and the angiosperms also called flowering plants from other members of the vascular plants.

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There are a large variety of different plants species in the word, grouped into various taxonomic classes. Most plants reproduce by seeds, but some have other ways to propagate their species. Naked seed plants are called gymnosperms.

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Gymnosperms and angiosperms are two types of vascular plants that make up the spermatophytes plants that produce seeds. Angiosperms are flowering plants that have seeds contained within a fruit. The term angiosperm also alludes to the fact that the seed of the plant is produced in an enclosed space, such as within fruit.

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Features causing hemlocks to be "typical gymnosperms" include the fact that its leaves are needlelike and evergreenand it produces cones. The same can be said about most of the best-known gymnosperms, including pines, spruce and firs. However, these features are not what make a gymnosperm a gemnosperm.

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