Bio Ch 21

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Bio Ch 21
2012-09-10 22:01:36
Bio 21

Bio Ch 21
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  1. Alternation of generations
    a life cycle, typically of plants, in which a diploid sporophyte (spore-producing) generation alternates with a haploid gametophyte (gamete-producing) generation
  2. angiosperm
    a flowering vascular plant
  3. antheridium
    a structure in which male sex cells are produced; found in nonvascular plants and certain seedless vascular plants
  4. archegonium
    a structure in which female sex cells are produced; found in nonvascular plants and certain seedless vascular plants
  5. conifer
    a member of a group of nonflowering vascular plants whose members reproduce by means of seeds formed inside cones; retains its leaves throughout the year
  6. cuticle
    a waxy or fatty coating on the surface of aboveground epidermal cells of many lands plants; aids in the retention of water
  7. flower
    the reproductive structure of an angiosperm plant
  8. fruit
    in flowering plants, the ripened ovary (plus, in some cases, other parts of the flower), which contains the seeds
  9. gametophyte
    the multicellular haploid stage in the life cycle of plants
  10. gymnosperm
    a nonflowering seed plant,such as a conifer, gnetophyte, cycad, or gingko
  11. lignin
    a hard material that is embedded in the cell walls of vascular plants and that provides support in terrestrial species; an early and important adaptation to terrestrial life
  12. nonvascular plant
    a plant that lacks lignin and well-developed conducting muscles; they include mosses, hornworts, and liverworts
  13. ovule
    a structure within the ovary of the flower, inside which the female gametophyte develops; after fertilization, it develops into the seed
  14. pollen
    the male gametophyte of a seed plant
  15. seed
    the reproductive structure of a seed plant, protected by a seed coat; contains an embryonic plant and a supply of food for it
  16. sporophyte
    the multicellular diploid stage in the life cycle of a plant; produces haploid, asexual spores through meiosis
  17. stoma
    an adjustable opening in the epidermis of a leaf or young stem, surrounded by a pair of guard cells, that regulates the diffusion of carbon dioxide and water into and out of the leaf or stem
  18. vascular plant
    a plant that has conducting vessels for transporting liquids; also called a tracheophyte

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