Plant Homeostasis - PowerPoint PPT Presentation

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Plant Homeostasis

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  1. Plant Homeostasis Structure and Function

  2. Flowers • Organs of sexual reproduction in plants

  3. Roots • Function • Provide support • Absorb water • Osmosis occurs at the root tip. • May contain sugars that help the plant get energy

  4. Leaf Function Contain photosynthetic cells that produce the plant’s food (Glucose) Stomates – small pores in the leaf’s surface Guard Cells – control the opening and closing of the stomates.

  5. Water Homeostasis in Plants • Stomate Open – When there is sufficient water Allows CO2 IN Allows H2O OUT • Stomate Closed – Under dry conditions Keeps H2O in, but doesn’t get any CO2

  6. Stem Function • Support the plant • Xylem • Long thin tubes that transport water • Phloem • Long thin tubes that transport sugars (sap)

  7. Movement of Food and water

  8. Movement of Food and Water

  9. Water Movement Transpiration -Water moves into roots by diffusion (osmosis). Water evaporates from the stomates creating a suction Water flows from the roots to the leaves to replace the lost water Capillary Action – movement of water into small spaces Root Pressure – diffusion of water into roots creates a pressure

  10. Sugar Transport • Pressure flow model Transport moves sugar from the leaves through the stem to all parts of the plant, mainly the roots (storage)

  11. Regulation of Plant Growth • Hormones- chemical messengers that regulate plant function • Auxins-hormones that stimulate plant growth. Located at root tips and stems. • Tropism- Plant growth towards a stimulus • Phototropism- growth towards sun(leaves) • Geotropism-growth towards earth(roots)

  12. Plant Nutrition • Photosynthesis- Capturing of sunlight to make food (glucose) • Photosynthesis is the source of most of the oxygen in the air. • Occurs within the Chloroplasts which contains Chlorophyll (green pigment) and absorbs light energy from the sun to make glucose • Chorophyllabsorbs red & blue and reflects Green light

  13. Chemical Equations for Photosynthesis and Respiration

  14. Comparison Chart of Photosynthesis and Respiration They are Reverse reactions of each other RESPIRATION Formula