1. Plant Transport Water Transport 1. Enters root by osmosis
2. Passes through cortex (parenchyma) tissue by osmosis
3. Passes through endodermis
One way only
Combination of active transport and osmosis

2. Plant Transport Water Transport (cont) 4. Enters xylem Cohesion-
The attraction of water molecules to each other
Transpiration-
The evaporation of water from the leaves of plants

3. Plant Transport Water Transport (cont) 5. Transpiration Pull-
The force that pulls water upward.
Cohesion holds the water column together as it moves upward through the xylem

4. Plant Transport Food Transport Requires energy (active transport)
Translocation-
Movement of food through the phloem
Pressure Flow Hypothesis (source-sink)
Food moves from an area of high pressure to low pressure

5. Plant Transport Food transport High Pressure (Source)-
Could be leaves when food is formed
Could be areas of food storage (root, stem, etc)
Low Pressure (Sink)-
Could be where food is used for growth.
Could be where food is stored.

6. Plant Motions Auxins- Plant hormones Stem growth- Root growth-
Stimulate or inhibit cells to grow
Depends on the target organ
Stem growth-
Auxins stimulate stem cell growth
Root growth-
Auxins inhibit root cell growth

7. Plant Motions Tropism- Response of a plant to environmental stimuli
Positive-
Respond toward the stimulus
Negative-
Respond away from the stimulus

8. Plant Motions
Phototropism-
Response of plants to light
Stem- positive

9. Plant Motions Gravitropism or geotropism-
Response of plants to gravity
Stem- negative
Root- positive

10. Plant Motions Thigmotropism- Response of plants to touch
Tendril- positive

11. Flowering Photoperiodicity- Short day plants-
Response of flowering plants to different light conditions
Short day plants-
Flower when time exposed to light is short
ex. chrysanthemums & poinsettias

12. Flowering Long day plants-
Flower when the amount of time exposed to light is long
ex. clover, petunias, & hollyhocks

13. Flowering Day-neutral plants-
Length of light has no effect on flowering
ex. corn & tomato
Actually the amount of darkness, not light, that stimulates these plants