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BIOA02H3 : Lec09 - Transport in Plants.doc

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School
UTSC
Department
Biological Sciences
Course
BIOA02H3
Professor
Mary Olaveson

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BIOA02H3 Full Course Notes
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BIOA02H3 Full Course Notes
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Document Summary

Slide one basic plant needs: sugar, runs from phloem of the year down the shoot. H2o: h2o, runs from the xylem of the year up the shoot, o2, minerals. Slide two water and sugar transport through plants: water transport through xylem, hypotheses on mechanisms of water transport, synthesis; total plant water transport, control of water transport, sugar transport through phloem. Slide three water movement through xylem: three hypotheses, capillary action, root osmotic push, transpiration. Slide six high solute concentration in root hairs: plant actively pumps ions into root cells through atp, high [ions] greater osmotic pressure in root hears than surrounding soil h2o. Water moves into cells by osmosis: solutes (e. g. salt) have a tendency of pulling water towards it, high solute concentration usually refers to low solvent (i. e. water concentrations) Slide seven transpiration: pushes water up a distance of 100+ meters.

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Related Questions

Compare transport of water and sugar in the plant vasculature (see Figure 36.17). Which statement is true?

1. sugar is transported by bulk flow, whereas water is transported by osmosis
2. water and sugar are transported in the same vessels
3. water is transported by negative pressure and sugar is transported by positive pressure
4. water is only transported up the plant, while sugar is transported in any direction

1. How does gas exchange associated with photosynthesis affect transpiration rates?

2. If a mutation caused the stomata of a plant to stay permanently open, how would the rate of transpiration and photosynthesis would be affected? Would this be a beneficial trait? Explain.

3. Describe three adaptations that make it possible for desert plants to survive with very little water.

4. The introductory material described the role cohesion plays in water transport in plants. Describe here how adhesion is important for transpiration in plants.

What would increase the water transport in plants?