Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Using sucrose as your example, summarize how a substance moves from a source into sieve tubes and then is unloaded at a sink. What is this mechanism called, and why?

Summary Introduction

To review:

The mechanism involved in the movement of a substance from a source into sieve tubes and its unloading at sink.


Plants need important components in order to regulate their growth and nourishment. The movement of water and other organic components in plants takes place through different processes. This movement takes place through the vessels present inside the plant.


The mechanism involved in the process is called pressure flow mechanism. Loading of sucrose in the sieve tubes causes rise in its concentration. This result in the fall of water potential and movement of water takes place through osmosis.

The movement of water through the sieve tubes causes increase in turgor pressure, and bulk flow carries fluid rich in sucrose into the large sieve tubes...

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