Lecture 12 - Lecture 12 Stomata tiny openings in stem...

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October 17, 2011 Lecture 12 Gametangia o Multicellular o 2 types Antheridium – many sperm o Adaptation to land Gametes not dispersed through H2O Dispersed through air or by animals Could dry out In comparison o Algae do not have cuticle No stomata Have unicellular gametangia Gametes dispersed through water III. Reproduction a. Alternation of generation a. Part of life cycle in a multicellular haploid stage a.i. Part in diploid stage b. Basic life cycle b.i. Gametophyte – HAPLOID b.ii. Sporophyte – DIPLOID b.iii. Only diploid cells undergo meiosis - spores A. Bryophyte a. Mosses b. Liverworts c. Hornworts d. Nonvascular B. Seedless nonvascular plants a. Ferns b. Horsetails c. Whisk ferns d. Club mosses e. Require H2O to reproduce f. 420 million years ago C. Gymnosperms a. Naked seed a.i. Seed plants a.ii. Vascular a.iii. 360 mya D. Angiosperms a. Angio means container
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b. Flowering plants c. Form seeds that are enclosed in fruit
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Lecture 12 - Lecture 12 Stomata tiny openings in stem...

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