1 / 22

Vascular Plants

Vascular Plants. Moving to Land. Overtime, 500 millions of years ago, plants on Earth evolved from aquatic to terrestrial environments What are some problems to overcome? Material transport Structure/support Desiccation Gas exchange. Benefits to moving to land.

mike_john
Download Presentation

Vascular Plants

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. Vascular Plants

  2. Moving to Land • Overtime, 500 millions of years ago, plants on Earth evolved from aquatic to terrestrial environments • What are some problems to overcome? • Material transport • Structure/support • Desiccation • Gas exchange

  3. Benefits to moving to land • easier access to sunlight for photosynthesis, • continuous free movement of carbon dioxide and oxygen

  4. Vascular Plant Organs Roots, stems and leaves

  5. Vascular Plant Organs • Roots – Absorb water and dissolved nutrients from soil • Anchor plants – in the soil and prevent them from being knocked down by wind • Storage – site for food storage

  6. Vascular Plant Organs • Stems – Support - hold leaves up towards the sun for optimal exposure for photosynthesis • Transport – between roots and leaves (via vascular tissue, phloem and xylem • Storage – site for food storage

  7. Vascular Plant Organ • Leaves – Photosynthesis and Cellular respiration • Formulas???? • Modified to reduce transpiration • Cuticle and pores

  8. Vascular Tissues • http://www.harcourtschool.com/activity/vascular/vascular.html

  9. Vascular Plant Tissues • XYLEM– Carries water and dissolved nutrients from the soil, from the roots, into the stem and into the leaves. • It forms a continuous set of tubes that stretch from the roots to the leaves

  10. Vascular Plant Tissue • PHLOEM– Distributes food made in the leaves throughout the plant. • The glucose produced by photosynthesisin the leaves, moves down towards the roots.

  11. Questions • The direction of glucose transport can be reversed in situations when the glucose levels in the roots are greater than in the leaves. • In which situations might this occur?

  12. Vascular Tissues

  13. Vascular Plants • 10 phyla • Includes:1) seedless vascular plants (ie. ferns) 2) plants with unprotected seeds (ie. Cone-bearing plants) 3) flowering plants

  14. Similarities with mosses • 1) free-living gametophyte • 2) no seeds • 3) mobile sperm that require water for fertilization

  15. Differences from mosses • 1) a vascular system which transports water, nutrients and photosynthetic products around the plant, • 2) sporophytes as the dominant life stage • 3) stomata

  16. Fern • Most diverse group of plants • Most abundant after flowering plants • Alternation of generation between gametophyte (haploid) and sporophyte (diploid)

  17. Fern Life Cycle • http://trc.ucdavis.edu/biosci10v/bis10v/media/ch15/fern_life_cycle_v2.html • Takes notes from fig 10.7

  18. Fern Life Cycle -gametophyte (n) makes gametes sperm (n) and egg (n) -gametes fuse when mature, fertilization -zygote (2n) develops attached to gametophyte (n) -zygote becomes spore-bearing sporophytes (2n) -spores (n) disperse and develop into gametophytes(n)

  19. Fern Sporophyte -large leaves are called fronds -fronds contain spores on the underside, contained in a sac called sporangia -sporangia cluster together to form a sori

  20. Fern Gametophyte

  21. Young sporophyte growing out of a gametophyte Sori containing clusters of sporangia Grape-looking structures are individual sporangium

  22. Video of sporagnium releasing spores

More Related