1. BELL WORK (Buff Binder): Copy the question below and write your entire answer: Gametes produced by flowers are used to carry out what function? a.Transportation b.Photosynthesis c.Gravitropism d.Reproduction

2. Set up today’s page… Page: 66 Date: 2-19-15 Title: Plant Transport Essential Question: How do the support and transport systems help plants maintain homeostasis? YES, Cornell notes!

3. Today we’re going to look at how plants maintain homeostasis.

4. STRUCTURE & SUPPORT

5. Roots: Hold plant in position Absorb water and minerals from the soil Contain specialized cells for water intake

6. (Wheat seed) Root hairs Fragile parts of cells that grow from the main root They massively increase the surface area for absorption

7. Root hair cells (x150)

9. Stems: Support structures connect and carry water & nutrients between roots and leaves

10. TRANSPORT SYSTEM

11. Vascular tissue: specialized tissues used to move water and nutrients throughout a plant

12. Xylem: cells that carry water up from the roots Phloem: cells that transport food (from photosynthesis) down from the leaves

13. What about leaves?

14. Leaves: organs that perform photosynthesis and contain vascular tissue

15. Cuticle: a thick waxy layer that protects against injury and water loss

16. GAS EXCHANGE Leaves are designed to allow carbon dioxide to get to the main chlorophyll layer at the top of the leaf They have small holes called stomata on the under surface Each hole is open & closed by 2 guard cells

17. Stomata: openings in the underside of a leaf that allow carbon dioxide and oxygen to diffuse (move) into and out of the leaf Guard cells: specialized cells that control the opening and closing of stomata

18. Each opening is controlled by two guard cells. closed open

19. gas exchange in the leaf Carbon dioxide oxygen Guard cell

20. Structures of the Leaf Photosynthesis Conserves water Transports water and sugar to stem and roots

21. Why do stomata open and close?

22. Stomata open and close at different times of the day OPEN = when carbon dioxide is needed for photosynthesis CLOSED = to conserve water

23. Gas exchange

24. Transpiration: the loss of water through leaves

25. Debrief/Summary: Explain how a plant might respond to each of the following situations… 1.drought (not enough water) 2.flood (too much water) 3.extra carbon dioxide in the air due to some crazy person singing to their plants 4.not enough carbon dioxide in the air