Plant Life Cycle: Flowers Flashcards

Vascular Plants
Terms Definitions
Tulipomania
(in 17th-century Holland) a widespread obsession with tulips, esp. of highly prized varieties, as those of a streaked, variegated, or unusual color
“complete” flower
contains all four floral appendages: sepals, petals, stamens and carpels
incomplete flowers
lacking one or more of the 4 organs
Irregular flowers
bilateral symmetry
Hypogynous
situated on the receptacle beneath the pistil and free of the ovary, as stamens, petals, or sepals
Perigynous
situated around the pistil on the edge of a cuplike receptacle, as stamens or petals
Epigynous
(of flowers) having all floral parts conjoint and generally divergent from the ovary at or near its summit
In angiosperms, the floral life cycle involves
meiosis, double fertilization, fruit and seeds within an ovary
Male gametophyte
Microspore mother cells produce 4 microspores each; Each microspore develops into a pollen grain via mitosis
ornamentation
allows pollen to be used to identify plant species
Palynology
the study of live and fossil spores, pollen grains, and similar plant structures; used by petroleum industry to look for oil deposits
Female gametophyte
Megaspore mother cell produces 4 megaspores; 3 degenerate, leaving one to undergo mitosis to become a mature female gametophyte; Eight nuclei develop
Double fertilization
fusion of an egg nucleus and a sperm + fusion of two polar nuclei and a sperm (= the endosperm)
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