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P5 and ‘The Great Celery Experiment’ On Thursday 22 January 2009, the Biology Department welcomed pupils and staff of P5 and explored the mysteries of ‘The Great Celery Experiment’. Plants really are amazing organisms.....P5 pupils have been learning about stems and the transport of water upwards from the roots. The first demonstration was to show that water (even when coloured with dye) WILL travel upwards, through the stem to reach the leaves and petals. How does water travel through the stem? The answer is special ‘straws’ take water upwards – these structures are called XYLEM: It was also possible to extract XYLEM vessels from the stems of celery and view them under the microscope: Looking for Xylem vessels........ Xylem vessels transport water and nutrients from the soil to the rest of the plant. They also help to keep the plant stem rigid and strong. Xylem vessels can be seen under the light microscope: The transport of water through a plant is an essential life-giving process that affects ALL organisms on Planet Earth. Investigating water transport in xylem...... Thank you to the teachers and pupils of GHS P5 – we enjoyed your visit.