Kingdom Plantae. General Characteristics Eukaryotic, multicellular organisms that carry out...
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![Page 1: Kingdom Plantae. General Characteristics Eukaryotic, multicellular organisms that carry out photosynthesis Cell walls contain cellulose Plants develop.](https://reader036.fdocuments.in/reader036/viewer/2022062720/56649f125503460f94c2569c/html5/thumbnails/1.jpg)
Kingdom Plantae
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General Characteristics
• Eukaryotic, multicellular organisms that carry out photosynthesis
• Cell walls contain cellulose
• Plants develop from embryos protected by tissues of the parent plant
• Includes mosses, ferns, conifers and flowering plants
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Plant Life Cycle
• Alternation of Generations– One generation is haploid and the other is
diploid– Called the gametophyte and sporophyte
generations– Pg.435, fig. 13.28
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Non-Vascular Plants
• Lack true roots, stems and leaves and do not have specialized tissues to transport materials throughout the plant.
• Bryophytes: mosses, liverworts and hornworts
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Vascular Plants
• Tracheophytes
• Conducting tissues Xylem and Phloem, allows plants to grow much taller.
• Spore producing vascular plants.
• Seed producing vascular plants.
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Spore-Producing Vascular Plants
• Need water to complete life cycle
• Club mosses and Horsetails – Most primitive
tracheophytes
• Ferns (p.438)– More widespred– Fronds contain
sporangia which contain spores
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Seed-Producing Vascular Plants
• Most successful plants on Earth
• Two main groups: cones and flowers
• Sexual reproduction occurs by pollination
• Do not need water to compete life cycle
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Gymnosperms
• Conifers, gnetae, ginkgos and cycads (p.439)
• Cones: specialized reproductive structures– Male (pollen cone) and female (seed) cones
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Angiosperms
• Flowering plants
• Reproduce sexually by means of flowers and pollination
• Seeds are contained in a protective wall which develops into a fruit
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Angiosperm Life Cycle
• Most successful plants on Earth
• Using flowers as reproductive structures frees the need for water
• Ingenious seed dispersal methods
• Well protected seeds
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The Flower
• Defining reproductive structure
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Pollination
• Angiosperms have developed amazing variety of methods to transfer pollen from one flower to another.
• Self-pollination: pollen from the same plant fertilizes an egg cell
• Cross-pollination: more common. Pollen is transferred from one plant to another of the same species by wind, water or animals.
• Flowers are adapted to specific methods of pollination
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Fertilization
• Pg. 442