Plant Parts & Their Jobs - PowerPoint PPT Presentation

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Plant Parts & Their Jobs

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  1. Plant Parts & Their Jobs

  2. Plant Jobs Write these down… • Primary source of food for people and animals • Produce oxygen • Absorb carbon dioxide • Continued…

  3. Plant Jobs • Slow wind speed • Provide homes for wildlife • Prevent erosion • Beautify surroundings • Furnish building materials and fuel

  4. Parts of a plant • Four basic parts • LEAVES • STEMS • ROOTS • FLOWERS Draw this on your notes

  5. LEAVES

  6. LEAVES • The greenest part of the plant • Act as solar collectors • Large leaves= areas of little sunlight • Tiny leaves = bright sunlight • Needles = no water loss

  7. LEAVES - structure • Epidermis - top and bottom tough layer • Pallisade Layer - most cells with chloroplasts are found here • Spongy Layer - gas exchange through stomata

  8. LEAVES - 2 functions • Make Food (sugar) in the chloroplasts • Gas Exchange take in carbon dioxide and release oxygen and water vapor Stomata on the bottom of the leaves have guard cells that open and close as they fill up with water.

  9. LEAVES - photosynthesis Plants make sugar using CO2 (from air) and H2O (from roots) as ingredients.

  10. STEMS

  11. STEMS - two main functions • Liquid transport xylem cells carry water & minerals up phloem cells carry food down • Support

  12. STEMS – example Dicot plants such as a bean (xylem & phloem in a ring under the bark) Cambium Phloem Xylem

  13. STEMS – example Monocot plants such as a corn stalk (vascular bundles scattered throughout the setm) Phloem Cells Xylem tube

  14. What Good Are Stems to humans? • FOOD-rhubarb, celery, white potato • WOOD – building and fuel • PAPER

  15. Types of Modified Stems • Bulbs: (onion) • Tubers: (potato) • Stolons: above ground runner (strawberry) • Rhizomes: below ground runners (field bindweed or creeping jenny)

  16. ROOTS

  17. ROOTS - functions • Anchor plant • Suck up water and minerals • Store Sugar (radish, carrot, beets) • Reproduction (eyes on potatoes)

  18. ROOTS - structure • root cap-protects tender cell division area as the root pushes through soil

  19. ROOTS – root hairs Water and minerals move into root by osmosis / diffusion

  20. What is Diffusion? • Diffusion is when particles move from areas of high concentration to low concentration. (Doesn’t have to be water) • Examples: Lighting a match, spraying perfume or cologne

  21. What is Osmosis? • Osmosis is a special type of diffusion that involves water. • Water moves from areas of high concentration to areas of low concentration. • Diffusion is when particles move from areas of high concentration to low concentration.

  22. FLOWERS, FRUITS, SEEDS

  23. FLOWERS, FRUITS, SEEDS • Main jobs involve reproduction • Attract pollinators • Disperse pollen • Fertilization • Disperse seeds

  24. FLOWERS, FRUITS, SEEDS • POLLEN normally carried by insects or wind • FRUITS & SEEDS normally carried by wind, animals, water or shot away from parent plants (projectiles)