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19 terms

Science Chapter 25 terms

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archegonium
reproductive structure that produces eggs in seedless plants
antheridium
reproductive structure that produces sperm in seedless plants
sorus
cluster of sporangia on a fern frond
pollen grain
structure consisting of a few haploid cells surrounded by a thick protective wall that contains a male gametophyte of a seed plant
ovule
structure of a seed plant sporophyte in which a female spore forms and then develops into a female gametophyte that contains an egg; structure in the ovary of a pistil that develops into a seed
pollination
transportation of pollen grains from a male reproductive structure of a flower to a female reproductive structure of a flower
polllen tube
structure that grows from a pollen grain to an ovule, enabling a sperm to pass directly to an egg
seed coat
the protective, outer covering of a seed
cotyledon
leaflike structure of a plant embryo; functions in the transfer of stored nutrients to the embryo, in which food is stored
sepal
structure of a flower that encloses and protects a flower bud
petal
structure of a flower that is often colorful and may attract pollinators to the flower
stamen
male reproductive part of a flower
anther
sac at the tip of a stamen in which pollen grains form
pistil
female reproductive part of a flower; consisting of an ovary, style, and stigma
ovary
reproductive structure that produces eggs; in flowering plants, that lower part of a pistil that produces eggs in ovules; in animals, the gamete-producing organ of the female reproductive system
double fertilization
process by which two sperm fuse with cells of the female gametophyte, producing both a diploid (2n) zygote and a triploid (3n) endosperm
vegetative reproduction
type of reproduction in which new plants grow from vegetative parts such as roots, stems, and leaves
plant propagation
practice of growing plants from seeds or vegetative parts
tissue culture
technique for growing pieces of living tissue in artificial media