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25 terms

Ch. 30 The Seed Plants

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Two clades of seed plants
Gymnosperms and angiosperms
What is a seed?
plant embryo packaged with a food supply and protective coating
pines and conifers
gymnosperms
flowering plants
angiosperms
flower
reproductive structure that bears seeds within ovaries
gametophytes in seed plants
highly reduced, microscopic
sporangia of seed plants
heterosporous; megasporangia and microsporangia
integuments
tissues protecting megasporangium
fertilized egg develops into...
diploid sporophyte embryo, which then develops into a seed
pollen grains
microspores released from microsporangium
sporopollenin
tough coat covering pollen grains
pollination
pollen grains carried by wind or animals until they land near ovule
fertilization tube
what pollen grain elongates into ovule to deliver sperm
cone
reproductive structure consisting of a cluster of specialized leaves called sporophylls
seeds of gymnosperms
"naked;" develop on surfaces of sporophylls
two types of conifers
evergreen, deciduous
gametophytes of conifers
heterosporous; small pollen cones and larger ovulate cones
sperm of gymnosperms
do not have flagella
pine seed
embryo (new sporophyte) and food supply derived from gametophyte tissue
flowers and fruits
angiosperms
phylum of angiosperms; two classes
Anthophyta, monocots and dicots
micropyle
pore in the ovule where pollen tube releases sperm cells
double fertilization
two sperm cells: one fertilizes egg and other fuses with two haploid to form triploid cell that will produce endosperm
cotyledons
rudimentary root and one or two seed leaves of angiosperm embryo
endosperm
where food is stored for developing endosperm