Transport in Plants

Transport in plants Watch the video, then sort the correct characteristics for each xylem and phloem. Xylem carries water and nutrients from the soil up to the leaves. doesn't need energy. pulled up water by transpiration pull-cohesion tension. consists of two types of elongated cells: tracheid and vessel elements. secondary cell walls hardened with lignin. dead cells. unidirectional transport. direction of transport is upwards only. Phloem living cells. bidirectional transport. direction of transport is upwards and downwards. carries sugars from the source (leaves) to the sink ( target cell that needs sugar) by a process called translocation. active transport( needs energy). thin walls ( primary cell walls). Match the steps of translocation in column 1 with the correct explanation in column 2. 1. Loading active transport. Put the sugar into the phloem tube. 2. Osmosis I Water flows from xylem into phloem by osmosis. 3. Bulk flow the sap (solution of water and sugar) will move automatically from high pressure area to lower pressure area. 4. Unloading sugar moves from phloem to the sink passively ( no energy required). 5. Osmosis II Water moves back to the xylem by osmosis.