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Vascular tissue: the tissue in higher plants that constitutes the vascular system, consisting of phloem and xylem, by which water and nutrients are conducted throughout the plant.
Seeds:a flowering plant's unit of reproduction, capable of developing into another such plant.
Alteration of generations: a pattern of reproduction occurring in the life cycles of many lower plants and some invertebrates, involving a regular alternation between two distinct forms. The generations are alternately sexual and asexual (as in ferns) or dioecious and parthenogenetic
Sporophyte: (in the life cycle of plants with alternating generations) the asexual and usually diploid phase, producing spores from which the gametophyte arises. It is the dominant form in vascular plants, e.g., the frond of a fern.
Spore:a minute, typically one-celled, reproductive unit capable of giving rise to a new individual without sexual fusion, characteristic of lower plants, fungi, and protozoans.
Gametophyte: (in the life cycle of plants with alternating generations) the gamete-producing and usually haploid phase, producing the zygote from which the sporophyte arises. It is the dominant form in bryophytes
Nonvascular plant: Non-vascular plants are plants without a vascular system (xylem and phloem). Althoughnon-vascular plants lack these particular tissues, many possess simpler tissues that are specialized for internal transport of water.
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