Control and coordination in plants — practice question

Complete the passage by inserting the most suitable scientific term(s). Auxin is made in the growing tips of shoots (apical buds). It is carried from there down the shoot by .................................... from cell to cell and also, to a lesser extent, by .................................... flow in the .................................... . Auxin seems to help determine whether a plant grows upwards or whether it produces side branches. When the apical bud is growing actively, it tends to prevent lateral buds from growing. This is called apical .................................... . The plant grows upwards rather than branching out sideways. However, if the apical bud is removed, the lateral buds begin to grow. It is thought that removing the apical bud causes the concentration of auxin in lateral buds to .................................... so the buds can now grow by cell .................................... and cell .................................... .