OCR Biology 3.3 Key Definitions 0.0 / 5 ? BiologyTransport in PlantsASOCR Created by: milly._98Created on: 25-04-16 12:47 Meristem A layer of dividing cells 1 of 18 Phloem Transports dissolved assimilates down the stem 2 of 18 Xylem Transports water up the stem 3 of 18 Vascular Tissue Consists of cells specialised for transporting fluids by mass flow 4 of 18 Companion Cells The cells that help to load sucrose into the sieve tubes 5 of 18 Sieve Tube Elements Makes up the tubes in phloem tissue that carries sap up and down the plant 6 of 18 Plasmodesmata Gaps in the cell wall containing cytoplasm that connects two cells 7 of 18 Potometer A device that can measure the rate of water uptake as a leafy stem transpires 8 of 18 Transpiration The loss of water vapour from the aerial parts of a plant, mostly through the stomata in the leaves 9 of 18 Transpiration Stream The flow of water through a plant from the roots to the leaves via the xylem vessels 10 of 18 Adhesion The attraction between the water molecules and the walls of the xylem vessel 11 of 18 Cohesion The attraction between water molecules caused by the hydrogen bonds 12 of 18 Hydrophyte A plant adapted to living in water or where the ground is very wet 13 of 18 Xerophyte A plant adapted to living in dry conditions 14 of 18 Assimilates Substances that have become a part of the plant 15 of 18 Sink A part of the plant where those materials are removed from the transport system 16 of 18 Source A part of the plant that loads materials into the transport system 17 of 18 Translocation The transport of assimilates throughout a plant 18 of 18
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