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Study Questions

1. A sucrose molecule has been synthesized in the chloroplast stroma of a mesophyll cell. Describe the path that the sucrose molecule would follow if it is to become part of the sucrose pool in a developing seed.

2. Describe the anatomy of a sieve element.

3. What is a typical velocity of sap moving in the phloem? Can phloem sap move at that velocity by diffusion?

4. Describe the pressure-flow model of translocation in the phloem. Does water move down its water potential gradient in this model?

5. Explain the concepts of source and sink in phloem transport. Leaves are said to be sinks early in development and to become sources as they attain photosynthetic competence. What experiments would you design to study the leaf transition from sink to source?