1 / 38

Ch. 7: Plant Growth and Reproduction

Ch. 7: Plant Growth and Reproduction. Parasitic Epiphytes. Hemiparasites : Chlorophyll-- water & nutrients from host xylem Ex, Who am I? (Lab #2). Plant Reproduction. Sexual reproduction : genetically varying offspring (via meiosis & fertilization). Plant Reproduction.

johncarr
Télécharger la présentation

Ch. 7: Plant Growth and Reproduction

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Ch. 7: Plant Growth and Reproduction

  2. Parasitic Epiphytes • Hemiparasites: Chlorophyll-- water & nutrients from host xylem • Ex, Who am I? (Lab #2)

  3. Plant Reproduction • Sexual reproduction: genetically varying offspring (via meiosis & fertilization)

  4. Plant Reproduction • Asexual reproduction: genetically identical offspring (involves mitosis) • Ex, clonal growth (discussed)

  5. Plant Reproduction • Agamospermy: seeds • Exs: some Taraxacum (dandelion), Rubus

  6. Plant Reproduction • Asexual reproduction: genetically identical offspring • Sexual reproduction: genetically varying offspring (via meiosis and fertilization)

  7. Plant Reproduction • Meiosis: reduction division • 2N to 1N

  8. Plant Reproduction • Fertilization: gametes (egg+sperm) form zygote • 1N to 2N Human example….

  9. Plant Life Cycle • Life cycle: Involves 1) meiosis, 2) fertilization, 3) 1N cells, 4) 2N cells

  10. Plant Life Cycle • Sporic meiosis: • 2 bodies, 1 cycle: alternation of generations • Sporophyte 2N, gametophyte 1N

  11. Plant Life Cycle • Gametophyte (1N): gametes BY…..meiosis/mitosis?? Start

  12. Plant Life Cycle • Gametophyte (1N): gametes BY MITOSIS • Fertilization: zygote (2N)

  13. Plant Life Cycle • Zygote to sporophyte (2N): mitosis • Sporophyte: spores BY MEIOSIS

  14. Plant Life Cycle • Zygote to sporophyte (2N): mitosis • Sporophyte: spores BY MEIOSIS • Spore to gametophyte: mitosis End

  15. Plant Life Cycle • Mosses: gametophyte leafy • Sporophyte on gametophyte Granite outcrop lab

  16. Plant Life Cycle Seed plants + ferns: major body = _______ Who am I? (Lab 2) Epiphyte fern Site for sori…. Lab #1? Where other “body”?

  17. Plant Life Cycle • Where gametophytes? • Seed plants: male = pollen grain Ferns

  18. Plant Life Cycle • Female gametophyte (embryo sac): inside ovule Ovules in ovary

  19. Life Cycle • Mature male gametophyte = pollen tube • Fertilization: • Sperm + egg DOUBLE fertilization!

  20. Life Cycle • Zygote: embryo • Endosperm: nutritive • Ovule: becomes seed What’s a seed??

  21. Life Cycle • Seed:

  22. Terms • Flower parts (BIOL 1030) • 4: sepals, petals, stamens, pistil(s) Carpel= Pistil here

  23. Floral variation • Fusing petals • Long-tongued/long-billed pollinators seeds Who am I? (Lab #2)

  24. Floral variation • Stamens & pistils: perfect flowers

  25. Floral variation • Some imperfect. • Pistillate (pistil) or staminate (stamens) Pistillate flowers of Sagittaria Staminate flowers of Sagittaria

  26. Floral variation • Pistillate & carpellate on separate inds.: dioecious (MUST outcross) • Monoecious: both sexes on Cones!

  27. Persimmon fruits Floral variation • Ex. dioecious species: Persimmon (Diospyros virginiana) Pistillate flower Staminate flower

  28. Floral variation • Complete flowers: all 4 parts (sepals, petals, stamens, pistil) • Lack at least 1: incomplete flowers Diospyros?

  29. Floral variation • Group flowers: inflorescence • One type: head • Ex, sunflower (Asteraceae) • Ray flowers: • Disk flowers ray flowers disk flowers

  30. Floral variation • Who am I? (Lab #1) • Inflorescence: white structures = bracts Closeup showing individual greenish flowers Inflorescence

  31. Pollination • Why flowers vary? Many form mutualism w/ animals

  32. Terms • Pollination (flowering plants): transfer Carpel=pistil

  33. Terms • Fertilization: sperm fuses w/ egg (

  34. Pollination • Abiotic: pollen

  35. Wind Pollination • Grasses, temperate trees (Quercus, Carya, Pinus) • Not mutualism A grass Carya

  36. Terms • Biotic pollination: pollen carried by animal--90% flowering plants • Floral visitor: • Pollinator: deposits

  37. Pollination as Mutualism Mutualism (+,+) interaction • Plant gets Reward?

  38. Animal Rewards • Pollen: Renewable…

More Related