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Botany: Part I Overview of Plants & Plant Structure

Botany: Part I Overview of Plants & Plant Structure. Eukaryotic Autotrophs Cell Wall - cellulose Alternation of Generations Embryophytes – protected embryo. Characteristics of Land Plants. Photosynthetic Autotrophs. Alternation of Generations. Alternation of Generations. Key.

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Botany: Part I Overview of Plants & Plant Structure

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  1. Botany: Part IOverview of Plants & Plant Structure

  2. Eukaryotic Autotrophs Cell Wall - cellulose Alternation of Generations Embryophytes – protected embryo Characteristics of Land Plants

  3. Photosynthetic Autotrophs

  4. Alternation of Generations

  5. Alternation of Generations Key Haploid (n) Diploid (2n) Sporedispersal MEIOSIS Sporangium Maturesporophyte(2n) Sporangium Sorus Fiddlehead (young leaf)

  6. Alternation of Generations Key Haploid (n) Diploid (2n) Antheridium Spore(n) Younggametophyte Sporedispersal MEIOSIS Rhizoid Undersideof maturegametophyte(n) Sporangium Sperm Archegonium Egg Maturesporophyte(2n) Sporangium FERTILIZATION Sorus Fiddlehead (young leaf)

  7. Alternation of Generations Key Haploid (n) Diploid (2n) Antheridium Spore(n) Younggametophyte Sporedispersal MEIOSIS Rhizoid Undersideof maturegametophyte(n) Sporangium Sperm Archegonium Egg Maturesporophyte(2n) Newsporophyte Sporangium Zygote(2n) FERTILIZATION Sorus Gametophyte Fiddlehead (young leaf)

  8. Four Groups Bryophytes Ferns Gymnosperms Angiosperms

  9. Adaptations for Moving on To Land • Prevention from dehydration-Evolution of waxy cuticle • Method of gas exchange for photosynthesis-Evolution of stomata and lenticels. • Method to obtain water and minerals-Evolution of roots • Increase in size and support-Evolution of xylem fortified with lignin • Method of reproduction without water-Evolution of pollen and pollination strategies. • Method of protecting embryo from dehydration-Evolution of the seed

  10. Bryophytes • Nonvascular land plants • Mosses, liverworts and hornworts • Gametophyte (n) is photosynthetic , dominant generation • Typically ground-hugging plants (Why?)

  11. Ferns • Seedless vascular plants • Horsetails and ferns • Sporophyte (2n) is dominant generation • Most common in damp areas due to flagellated sperm that must swim to reach eggs

  12. Gymnosperms • “Naked” seeds not enclosed in ovaries • Conifers, ginkgos, and cycads • Sporophyte (2n) is the dominant generation • Seeds are exposed on modified leaves that usually form cones

  13. Angiosperms • Flowering plants • Pecan trees, roses, peach trees, tomatoes • Sporophyte (2n) generation is dominant • Flowers and fruit • Most abundant of all plant species

  14. Plant Structure and Function A simple body plan underlies the diversity of plant forms that exist today.

  15. Hierarchy of Plant Organization Systems - root and shoot Organs – roots, stems, and leaves .

  16. Organ Systems:

  17. Organs: Roots Roots – anchor a vascular plant to the soil, absorb minerals and water, and often store carbohydrates

  18. Root Adaptations Each of these evolutionary root adaptations increase plant survival in a given environment.

  19. Organs: Stems the main photosynthetic organs Stems – lift leaves and reproductive structures

  20. Stem Adaptations Some plants have stems with additional functions, such as food storage and asexual reproduction. These are examples of modified stems.

  21. Organs: Leaves Leaves – the main photosynthetic organs

  22. Types of Leaves

  23. Leaf Adaptations Some plant species have leaves with adaptations that function in support, protection, storage, or reproduction in addition to photosynthesis.

  24. Plant Tissues

  25. Location of Tissue Types Which tissue type in most abundant in plants? How is this representative of “form fits function”?

  26. Dermal Tissue Forms epidermis, usually one cell layer Some cells differentiate: • Stomata – pores for gas exchange • Trichomes – leaf hairs, protect against herbivores and damaging solar radiation • Root hairs – increase root surface area Epidermal cells of the shoot system secrete a waxy cuticle that limits water loss, reflects damaging solar radiation, and form a barrier against pathogens

  27. Ground Tissue Ground tissue is the most abundant tissue Cells differentiate: • Parenchyma– most abundant, carry out photosynthesis, store protein and starch • Collenchyma– elongated, thick cell walls, provide support • Sclerenchyma– thick cell walls reinforced with lignin, programmed cell death, cell walls remain to provide support

  28. Vascular Tissue Transport System Xylem – carries water and minerals from roots to rest of plants, composed of dead cells Phloem – is composed of living cells, moves carbohydrates from production sites to where they are either used or stored

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