Land Plants vs. Aquatic Plants - PowerPoint PPT Presentation

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Land Plants vs. Aquatic Plants
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Land Plants vs. Aquatic Plants

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  1. Land Plants vs. Aquatic Plants

  2. Land Plants • Vascular • They have “veins” that transport nutrients between leaves, roots, stems • The veins are actually vascular tissue called xylem and phloem Veins that carry water/nutrients

  3. Xylem: carries water from roots to other parts of the plant • Phloem: carries sugar and nutrients from leaves to the rest of the plant • Why would sugar come from leaves? • Photosynthesis takes place mostly in leaves • (Photosynthesis uses sun and CO2 to make sugar and O2)

  4. carbon dioxide water sugar oxygen

  5. Parts of a Plant leaf fruit flower seed stem roots

  6. Leaves • Main photosynthetic organ (why?) • Collects the most sunlight cuticle upper epidermis palisade cells lignin xylem phloem lower epidermis spongy cells guard cell stoma

  7. Flowers/Fruits/Seeds • reproductive organs • flower petals are modified leaves that attract pollinators • hold seeds • dispersed to help the plant grow in new places

  8. Stem/Roots • the stem holds up and support the plant; it also has vascular bundles of xylem and phloem • roots anchor the plant in the ground and absorb water and nutrients from the ground

  9. What is the most important thing for a plant? • Where would be the best place in the ocean for plants and other photosynthetic organisms to be? light near the surface

  10. Zones • Because light is so important to life, the ocean is separated in zones based on the amount of light that penetrates to that depth • photic means light • eu means good • dis means poor • a means no

  11. Aquatic Plants • What do you think are some advantages and disadvantages to living in or near freshwater and saltwater?

  12. Seagrasses • evolved from land plants • horizontal stems called rhizomes • very small flowers because… • they don’t need to attract pollinators • why not?

  13. Salt Marsh • A salt marsh is an area that is partially flooded at high tide

  14. Salt-Marsh Plants • Cordgrasses (halophytes- salt tolerant plants) • actually in grass family unlike seagrasses • not marine; just tolerant of salt • help protect areas from erosion • provide habitat and breedinggrounds • only get covered by salt water at high tides • salt glands in leaves excrete salt

  15. salt excreting from leaves

  16. Mangroves • trees and shrubs that live on shores • land plants tolerant of salt • create mangrove forests

  17. thick leaves to reduce water loss; also excrete salt • seeds grow for a little while on parent then drop into the sediment below

  18. Pneumatophores • specialized root extensions to help mangroves get extra oxygen because the mud they grow in doesn’t have enough

  19. mangrove roots beneath water provide shelter for many types of organisms