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20.2 Classification of Plants.ppt

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20.2 Classification of Plants.ppt

  1. 1. 20.2 Classification of Plants KEY CONCEPT Plants can be classified into nine phyla/divisions.
  2. 2. 20.2 Classification of Plants Land plants are classified by the presence or absence of vascular tissue and how they reproduce (with or without seeds) • “Vascular” – People: relating to vessels, especially those that carry blood. – Plants: relating to plant tissues that conduct water, sap, and nutrients.
  3. 3. 20.2 Classification of Plants Vascular Plants vs. Nonvascular Plants Vascular • Transport System – Leaves – True roots – Xylem – Phloem – Stems • Can grow tall • Live in dry areas Nonvascular • No Transport System – No roots (rhizoids) • Grow close to the ground to absorb water and nutrients • Live in moist areas *Complete Venn Diagram in notes
  4. 4. 20.2 Classification of Plants
  5. 5. 20.2 Classification of Plants Nonvascular Plants
  6. 6. 20.2 Classification of Plants Mosses and their relatives are seedless nonvascular plants. • Liverworts belong to phylum Hepatophyta. – often grow on wet rocks or in greenhouses – can be thallose or leafy
  7. 7. 20.2 Classification of Plants • Mosses belong to phylum Bryophyta. – most common seedless nonvascular plants – sphagnum moss commonly used by humans as “peat”
  8. 8. 20.2 Classification of Plants • Hornworts belong to phylum Anthocerophyta. – found in tropical forests and along streams – flat, lobed body with little green “horns”
  9. 9. 20.2 Classification of Plants Vascular Plants Seedless vs. w/Seeds
  10. 10. 20.2 Classification of Plants Club mosses and ferns are seedless vascular plants. • Club mosses belong to phylum Lycophyta. – not true mosses – oldest living group of vascular plants
  11. 11. 20.2 Classification of Plants • Ferns and their relatives belong to phylum Pterophyta. frond fiddlehead – whisk ferns and horsetails are close relatives of ferns – ferns have large leaves called fronds
  12. 12. 20.2 Classification of Plants Seed plants include cone-bearing plants and flowering plants. • Seed plants have several advantages over their seedless ancestors. – can reproduce without free-standing water, via pollination – seeds nourish and protect plant embryo – seeds allow plants to disperse to new places
  13. 13. 20.2 Classification of Plants • Gymnosperms do not have seeds enclosed in fruit. – most gymnosperms are cone-bearing. – the cone is reproductive structure of most gymnosperms. – pollen is produced in male cones. – eggs are produced in female cones. – seeds develop on scales of female cones.
  14. 14. 20.2 Classification of Plants • Cycads are gymnosperms in phylum Cycadophyta. – look like palm trees with large cones – grow in tropical areas
  15. 15. 20.2 Classification of Plants • Ginkgos are gymnosperms in phylum Ginkgophyta. – only one species alive today, Ginkgo biloba – grown in gardens and used in urban landscaping
  16. 16. 20.2 Classification of Plants • Conifers are gymnosperms in phylum Coniferophyta. – most common gymnosperms alive today – includes pines, spruce, cedar, fir, and juniper
  17. 17. 20.2 Classification of Plants • Angiosperms have seeds enclosed in some type of fruit. – A flower is the reproductive structure of angiosperms. – A fruit is a mature ovary of a flower. • Angiosperms, or flowering plants, belong in phylum Anthophyta.
  18. 18. 20.2 Classification of Plants Plant Classification Lab • Goal: Identify plants as either vascular or nonvascular based on microscope analysis. • This lab does not need to be a formal write up… only include the Title, Goal, and components listed below: – Draw image and label transport system components – Record slide name and number – Record as either vascular or nonvascular

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