28) Consider a maple tree throughout the course of the year.A. On the images below, indicate which direction water and sugar each movethrough the trunk of the tree during summer and winter by drawing and labelingarrows for water and sugar movement.SUMMERطر حالB. What type of pressure is responsible fori. Bulk flow of waterii. Bulk flow of sugarWINTERکے مال

Introduction Plans absorbs water through root from the soil and then it moves to the various parts of the plant body. By the process of photosynthesis plants produce carbohydrates in the leaf in the presence of sunlight and carbon dioxide. Answer to question no A) Explanation The maple tree has three types cells—vessels, tracheids, and fibers. It also has parenchyma cells, which are the ones that have the sugar stored in them. But the fibers cells do not have water. Water moves mostly in the vessels and in the tracheids. In the summer water is pulled upward in the trees. and then through transpiration water moves out of the atmosphere. In summer days in big maple tree mineral nutrients from the soil, along with sugar is dissolved in the water and collectively form the sap. During summer the sap ascends from root to leaf. In the winter, the vessels and tracheids of maple tree have water in them, but the fibers cells do not have water. When the temperature goes below the freezing temperature the fiber cells (gas-filled) freeze first. Then the little water on the wall of the fibre cells freeze that pulls more water into the cell. The other cell also freeze. Then there is thaw and everything melts. As a result water which has been pulled upward then tendency to go back downward. At the same time the bubbles present in the fiber cells deposits sugars in to the vessels and fibers and form sap. Therefore in winter water moves from leaf to root direction. answer to question no B) i) Pressure is responsible for bulk flow of water : transpiration pull, tensile strength of water ii) Pressure is responsible for bulk flow of sugar: osmotic pull