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44 terms

Modern Biology Chapter 30

STUDY
PLAY
antheridium
a male reproductive structure that produces hundreds of flagellated sperm by mitosis
archegonium
a female reproductive structure that produces a single egg by mitosis
homospory
the production of one type of spore
sorus
a cluster of sporangia
microspores
male spores
megaspores
female spores
heterospory
the production of different types of spores
integument
a thick layer of cells
micropyle
a small opening in the integument
ovule
a structure formed from the megasporangium and its integument
pollen grain
a microgametophyte of a seed plant
pollination
the transfer of pollen to ovules
pollen tube
a slender extension of the pollen grain that enables sperm to reach an egg
receptacle
the swollen tip of a floral branch
sepals
make up the outer whorl
petals
make up the next whorl
stamens
the male reproductive structures
anther
contains microsporangia
filament
a stalk-like structure that supports an anther
carpels
the female reproductive structures
pistil
one or more carpel fused together
ovary
the enlarged base of a pistil
style
usually stalk-like structure that arises from the ovary
stigma
the tip of the style
embryo sacs
the female gametophytes in angiosperms, and form within the ovary of the pistil
polar nuclei
the 2 nuclei that migrate to the center of the cell
tube cell
a structure that grows from the larger of the 2 cells in pollen grain formation
generative cell
enclosed in the tube cell and will divide by mitosis to form 2 sperm
nectar
a nourishing solution of sugars
double fertilization
the process of 2 cell fusions
propagation
the production of new individuals
seed coat
a protective coat surrounding the seed
plumule
the shoot tip, along with any embryonic leaves
epicotyl
extends from the pumule to the attachment point of the cotyledons
hypocotyl
extends from the attachment point of the cotyledons to the radicle
radicle
the embryonic root
hilum
a scar that marks where the seed was attached to the ovary wall
dormancy
a state of reduced metabolism in which growth and development do not occur
clone
exact duplicate of an organism
vegetative reproduction
an asexual reproduction involving vegetative parts of a plant
cuttings
new plants grown from piece of stems and roots that are cut
layering
the process of causing roots to form on a stem
grafting
the joining of 2 more plant parts to form a single plant
tissue culture
the production of new plants from pieces of tissue placed on a sterile nutrient medium