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Plant Homeostasis

Plant Homeostasis. Structure and Function. Flowers. Organs of sexual reproduction in plants. Roots. Function Provide support Absorb water Osmosis occurs at the root tip. May contain sugars that help the plant get energy. Leaf Function.

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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 Water Food • Transport moves water from • Roots through the Xylem • To all parts of the plant. • Mainly Leaves. Transport moves sugar From the Leaves through the Phloem To all parts of the plant Mainly Roots(storage)

  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 – turgor pressure 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 • Photoperiodism- the response a plant has to the light and dark hours • 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) It absorbs light energy from the sun to make glucose • Chorophyllabsorbs red & blue and reflects Green light

  13. Chemical Equations for Photosynthesis and Respiration • Inorganic molecules -------------------- Organic Molecules

  14. Comparison Chart of Photosynthesis and Respiration Photosynthesis Respiration Energy-Storage Energy Storage Occurs in Chloroplast Mitochondria Uses Sunlight, Co2, H2o o2, glucose Makes Glucose, o2 Co2, H2o, ATP They are Reverse reactions of each other RESPIRATION Formula

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