chapter 22 Flashcards
(18 cards)
Phylum Pinophyta:
- Confiers
- Strobili: pine cones
- Needlike leaves, arranged in clusters
o Clustr forms structure called fascicle: short shoot with restricted growth - Pines, firs, hemlocks, cedars, redwood
o Pines in area of frozen topsoil for part of year
o Leaves exposed to high winds, bitter cold temps
- Pollen cones
male strobilus that produces microsporangia
- Microsporophylls:
a leaf, usually reduced in size, on or within which microspores are produced
- Microsporangia:
a sporangium in which microspores are formed
- Microsporocytes:
a diploid cell that produces microspores upon undergoing meiosis
- Microspores:
a spore that develops into a male gametophyte
(microsporocyte)
- Pollen grains
a structure derived from the microspore of seed plants that develops into a male gametophyte
- Megaspores:
a spore that develops into a female gametophyte (megagametophyte)
- Megasporangia:
a sporangium in which megaspores are formed
- Megasporophylls:
a leaf, usually reduced in size, that produces megaspores following meiosi
- Seed cones:
female strobilus that produces megasporangia
- Megasporocyte:
a diploid cell that produces megaspores upon undergoing meiosis
- Micropyle:
a pore or opening in the integuments of an ovule through which a pollen tube gains access to an embryo sac or archegonium of a seed plant
pollen tube
a tube that develops from a pollen grain and conveys the sperms to the female gametophyte
generative cell
the cell of the male gametophyte of angiosperms that divides, producing two sperms; also, the cell of the male gametophyte of gymnosperms that divides, producing a sterile cell and a spermatogenous cell
spermatogenous cell
a cell in conifers that produces two male gametes
sperms
a male gamete; except for those of red algae and angiosperms, sperms are frequently motile and are usually smaller than the corresponding female gametes
embryo
an immature sporophyte that develops from a zygote within an ovule or archegonium after fertilization
