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look for elaters and spores gently breathe on task a

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Unformatted text preview: re female gametophyte egg(s) • • example: Equisetum (Phylum Arthrophyta) dissect strobilus: Task A­1: Observation of Task A­1: Observation of Homospory • Found at your table • remove a sporangiophore and crush on dry slide (put the strobilus back in the dish at your table!) • look for elaters and spores • gently breathe on spores to activate elaters • note: only one spore type • • • • example: Selaginella (Phylum Lycophyta) examine Selaginella strobilus slide for microsporangia and megasporangia examine sporeling slide (young sporophyte); goes with life cycle figure 4­2 complete life cycle on Figure 4­2 Task A­2: Observation of Task A­2: Observation of Heterospory • seeds are specialized structures to protect a sporophyte embryo • “telescoping of generations” • embryo encased in parent gametophyte and “grandparent” sporophyte tissues Seeds Seeds • protects from drying out, pathogens, and sometimes predators • may help disper...
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