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Plant Diversity and Life Cycles

Plant Diversity and Life Cycles

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Plant Diversity and Life Cycles

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  1. Plant Diversity and Life Cycles Biology 2 Chapter 29

  2. Lycophyta-Nonvascular Plants • Plants which lack xylem and phloem, the vascular tissues which carry water and sugars to all parts of the plant. • Lack true leaves, roots and stems • Hornworts, liverworts and mosses

  3. Hornworts

  4. Liverworts

  5. Mosses

  6. Life Cycle of Mosses • The dominant form of a moss is a clump of leafy green gametophytes which produces the sperm and the egg • Have alternation of generations • The alternate form is called the sporophyte and produces the spores

  7. Antheridium • The male reproductive structures that produce hundreds of flagellated sperm by mitosis

  8. Archegonium • The female reproductive structure that produces a single egg by mitosis

  9. Fertilization • When sperm unites with the egg and begins dividing to form the zygote haploid haploid diploid

  10. Sporophyte • Grows from the tip of a gametophyte and remains attached to it • Forms the spores by meiosis which are released and grow to produce the gametophyte

  11. Seedless Vascular Plants • Plants which reproduce by spores and lack vascular tissue • Ferns, horsetails and whisk ferns

  12. Pterophyta • Ferns

  13. Life Cycle of a Fern • Has alternation of generations • The sporophyte is the dominant form • The gametophyte is tiny and forms the antheridia and archegonia

  14. Sori • Located on the underside of a fern frond and contain the sporangia where the spores are formed

  15. Sphenophyta • Horsetails, Equisetum Equisetum

  16. Psilophyta • Whisk ferns