Plant Transport Water Transport 1. Enters root by osmosis

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Presentation transcript:

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

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

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

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

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.

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

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

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

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

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

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

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

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