1. Structure and Function
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 Phloem
Long thin tubes that transport water
Phloem
Long thin tubes that transport sugars (sap)

7. Water Food Transport moves water from Transport moves sugar
Movement of
Food and 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
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
Chorophyll absorbs 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 Released Energy
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