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Lecture 12

BIOL 101 Lecture Notes - Lecture 12: Sporangium, Sporophyte, Gametophyte

3 pages77 viewsFall 2016

Department
Biology
Course Code
BIOL 101
Professor
Brokaw
Lecture
12

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The plant kingdom: seed plants
Review question:
What is the term for cone-like clusters of leaves bearing sporangia?
Strobili
Heterospory:(required for spores)
Seed: a structure that includes a dormant plant embryo and a store of food, packaged
together within a protective coat
Protective coat is from megasporangium of the parent sporophyte
Remnant of entire female gametophyte is enclosed within the coat
Embryo is offspring sporophyte generation
Seeds:
Primary means of reproduction and dispersal of seed plants
Reproductively superior to spores on land (usually)
Protection by seed coat
Both seeds and spores are well protected
A dormant plant with leaves already formed
Embryo has big head start
A food supply
Lots of growth prior to photosynthesis
Two groups of seed plants:
Gymnosperm- “naked seed”
Seed is not surrounded by fruit
Seeds are totally exposed or borne on scales of cones (strobili)
Strobili: clusters of reproductive leaves bearing sporangia
Angiosperm- “seed enclosed in a vessel”
Produces seed within in a fruit
Also known as “flowering plants”
Gymnosperms:
Vascular plants
Unlike bryophytes
Produces seeds
Unlike bryophytes and ferns
Produce wind-borne pollen grains
Pollen grains are male gametophytes
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