Ch 22 Flashcards
Seed
borne in a cone not a fruit; nourishment of the embryo, dispersal to a new location, and dormancy during unfavorable conditions
Seed coat
the protective layer on a seed; the seed coat develops from one or both integuments
Embryo
protect zygote (egg+sperm)
Food reserves
nourishment
Seedling
.
Mature Sporophyte
.
Pollen cone (male strobilus)
simple cone with a single short unbranched axis that bears microsporophylls
Microsporangium
.
Microspore
.
Pollen grain (male gametophyte)
shed from the tree as pollen and carried in the wind
Sperm
pollen tube delivers the sperm cells to the archegonia; sperm cells motile
Ovulate cone (female strobilus)
.
Ovule
.
Megasporangium
inside each megasporangium is a single large megaspore mother cell that undergoes meiosis which results in one surviving megaspore and 3 that die
Megaspore
retained inside the megasporangium and grows into a large multinucleate megagametophyte