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Unformatted text preview: NOTES FOR BIOLOGY 1002 SECTIONS 001, 002 and 003 Spring 2010 Outline 3a CHAPTER 21 The Diversity of Plants >THE PRIMITIVE PLANTS Note: these organisms are covered in chapter 19 of the textbook Since plants (like other organisms) originated in the water, the most primitive plant types are the algae The three divisions that make up the algae: Red Algae Brown Algae Green Algae All three divisions share some common traits:-Most or all of life cycle in water Tidal forms-No vascular tissue-No leaves, stomata or cuticle-Variation in dominant form of the life cycle In some sporophyte is dominant In some gametophyte is dominant-Sporophyte and gametophyte can be Heteromorphic or Isomorphic Heteromorphic means the sporophyte and the gametophyte have a different overall appearance Isomorphic means the sporophyte and the gametophyte have a similar overall appearance The main distinguishing characteristics of the Kingdom Plantae are-Eukaryotic-Multicellular- Photosynthetic autotrophs-Varied and complex life cycles- Cell walls made of cellulose -Food reserve stored as starch or oils In addition to these characteristics, the plant kingdom shows a range of traits that appeared as plants made the transition from their origins in water onto the land. Some of these new traits are: Anchoring mechanism Roots Conducting vessels Xylem and Phloem Increased support mechanism Lignin External protection Cuticle Mechanism for gas exchange Stomata Xylem and Phloem are parts of the plants vascular tissue system ....
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- Spring '08