Compléter Transport systems in plantsVersion en ligne Complete this activity on transport systems in plants. par Belinda Schirmer 1 root adhesion theory xylem transpiration tracheids upwards vessels Cohesion phloem pulls photosynthesis water evaporates Transport systems in plants carry and mineral ions in one direction only , from the roots to the leaves , in the . The products of are delivered wherever required around the plant in the tissue . Xylem tissue is composed of xylem and xylem . The - cohesion - tension currently explains the movement of substances up the xylem vessels . Water from the leaves and creates tension , which more water up from the veins and then up the xylem vessel . between water molecules and between the water molecules and the xylem walls maintain the column of water . A small amount of pressure forces the water already present in the xylem vessels . 2 plates any source photosynthesis Phloem low Companion source translocation high tube sink sieve sink tissue is composed of two types of living cells : tube cells and companion cells . Sieve cells are lined up one under the other and have sieve at each end . The products of move through these tubes in a process called . cells assist the sieve tube cells . The movement of the products of photosynthesis in direction is explained by the - theory . Materials move in the phloem from a - pressure region where sugars are produced and loaded into the phloem ( ) to a - pressure region where they are required and unloaded ( ) .
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