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Plant Transport

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-

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Plant Transport

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  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 • 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- • 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

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