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Mineral Nutrition In Plants In addition to carbon, hydrogen and oxygen, which are obtained from carbon dioxide and water, green plants also need at least thirteen essential elements in order to produce new tissues and maintain their correct functioning. The three main minerals required are MINERAL FUNCTION DEFICIENCY NITRATES MAGNESIUM PHOSPHATES POTASSIUM Describe the mechanism by which mineral ions are taken up by roots List the ways in which root hair cells are adapted to performing their function Once in the root mineral ions are transported across the cortex and into the xylem vessels in three ways. Name and describe each pathway The diagram below shows the apparatus required to perform water culture experiments. Describe how you can carry out an investigation to observe the effects of mineral deficiency on the growth of seedlings.