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41 terms

Chapter 28/30 (Seed Plants)

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germinate
to begin to grow from an embryo into a mature form
seedling
a young plant grown from a seed
cone
a seed-bearing structure
deciduous
a tree that sheds and regrows its leaves in response to seasonal changes
ovary
the lower part of a pistil that produces eggs in ovules
seed plant
a plant that produces seeds
gymnosperm
a woody vascular seed plant whose seeds are not enclosed by an ovary or seed
angiosperm
a flowering pant that produces seeds within a fruit
microspores
the smaller, male spore
megaspores
the larger, female spore
heterospory
the production of two or more kinds of asexual spores
integument
the outer protective covering of an ovule or sporangia
micropyle
the small opening in the wall of an ovule through which pollen tube enters the ovule
ovule
structure in the ovary that contains an embryo sac and develops into a seed after fertilization
pollen grain
the structure that contains the male gametophyte of seed plants
pollination
the transfer of pollen to the pistil or ovule
pollen tube
a tube that grows from the pollen grain enters the embryo sac and allows fertilization
receptacle
the enlarged tip of a flower stalk to which the flower is attached
sepals
one of the outermost rings of modified leaves that protect the flower bud
petals
one of the usually brightly colored leaf-shaped parts that make up one of the rings of a flower
stamens
the male reproductive of a flower that produces pollen and consists of an anther
anther
the tip of a stamen which contains the pollen sac where pollen grains form
filament
the part of the stamen that supports the anther
carpels
the structure where the ovule is
pistil
the female reproductive part that produces seeds and consists of an ovary style and stigma, made of one or more fused carpels
ovary
the lower part of a pistil that produces eggs in ovules
style
the slender upper part of the pistil
stigma
the expanded apex of a pistil supported by the style the part of the pistil that receives the pollen
embryo sac
the female gametophye that develops from a megaspore
polar nuclei
the haploid nuclei in the embryo sac of a seed plant that fuses with a male gametete to form the triploid cell that develops into the endosperm
tube cell
the cell of a pollen grain that gives rise to the pollen tube
generative cell
the cell that divides mitotically and forms two sperm cells
nectar
the sugar containing fluid secreted by flowers to attract birds or insects for pollination
double fertilization
procces by which one of the two sperm nuclei fuses with the egg nucleus and polar nuclei
seed coat
the protective outer covering of a seed
plumule
the developing chute above the cotyledons in plant embryoes consits of an epicotyl and young leaves
epicotyl
the portion of the stem of a plant embryo that is between the cotyledons and the first true leaves
hypocotyl
the portion of the stem of a plant embryo that is between the cotyledons and the embryotic root
radicle
the embryotic or primary root
hilum
a scar that marks where the seed was attached to the ovary wall
dormacy
a sate in which seeds stop growth and development and reduce their metabolism especially respiration