Cations are more readily taken up than the same ion in chelated form. Anions are more attracted to the root surface than cations. Water logged soils may cause Ca deficiency. Dry soils may cause Ca deficiency. Each numbered question worth 5 points.
Phospholipids are the main component of the plasmalema and the tonoplast.
Lack of P means weaker membranes that are much more subject to breakdown and the contents of the cell leak into the apoplasm and the leaves thus appear water soaked. The monovalent form or any ion is more readily taken up than the divalent form of the same element. You have some plants that are suffering from excessive Na uptake. Explain Sodic water from sprinkler irrigation can be absorbed by the leaves whereas the sodic water from drip irrigation must pass through the root system and many plants are natrophobic so they retain the Na in the roots and transmit very little to the leaves. Once the Na reaches the leaves it is toxic.