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• Define translocation in terms of the movement of sucrose and amino acids in phloem: from regions of production (source) to regions of storage or to regions where they are used in respiration or growth (sink) • Explain that some parts of a plant may act as a source and a sink at different times during the life of a plant
Plants need to move molecules over very long distances, much more than animals do; they also do not have a circulatory system in place. Transport over longer distances proceeds through the vascular system (the xylem and the phloem) and is called translocation. An important aspect that needs to be considered is the direction of transport.
Distinguish between sources and sinks and provide examples of each. Explain the process of phloem loading, distinguishing between apoplastic and symplastic pathways. Explain how assimilate translocations through the phloem according to the pressure-flow hypothesis.
Translocation is the movement of assimilates around the plant from the source to the sink. Translocation is bidirectional, so dissolved solutes can move either up or down the plant. The phloem consists of sieve tube members and companion cells, which carry out translocation.
8 Απρ 2019 · Which process is an example of translocation? A absorption of water by the roots and its movement through the xylem to the leaves. B loss of water from the leaves as it evaporates into the air. C movement of sucrose from the leaves through phloem to other parts of the plant.
Explore the wonderful world of translocation in plants with our Translocation in Plants Information Poster: perfect for revising Topic 2 in AQA Biology. This eye-catching poster explains the process of translocation and the structure of the phloem in plants.
Translocation starts at a source, such as a leaf where sugars are made. Sugars are transported into phloem by active transport across the membranes of the living phloem cells. Water moves into the phloem cells by osmosis, which increases the pressure and pushes the sugars along the phloem tube.
