● It is absorbed as `color{brown}(" potassium ion" (K^+))`.

● In `color{violet}("plants,")` this is required in more abundant quantities in the `color{brown}("meristematic tissues,")` buds, leaves and root tips.

● `color{violet}("Potassium")` helps to maintain an `color{brown}("anion-cation balance")` in cells and is involved in `color{violet}("protein synthesis,")` opening and closing of `color{brown}("stomata,")` activation of enzymes and in the maintenance of the `color{brown}("turgidity of cells.")`

● `color{violet}("Plant absorbs calcium")` from the soil in the form of `color{brown}("calcium ions" (Ca^(2+)))`.

● `color{violet}("Calcium")` is required by `color{brown}("meristematic and differentiating")` tissues.

● During `color{violet}("cell division")` it is used in the `color{violet}("synthesis of cell wall")` , particularly as `color{brown}("calcium pectate")` in the `color{brown}("middle lamella.")`

● It is also needed during the formation of `color{brown}("mitotic spindle.")`

● It accumulates in `color{brown}("older leaves.")`

● It is involved in the normal functioning of the `color{brown}("cell membranes.")`

● It activates certain enzymes and plays an important role in regulating `color{violet}("metabolic activities.")`

● It is absorbed by `color{violet}("plants")` in the form of `color{brown}("divalent" Mg^(2+))`.

● It activates the enzymes of `color{brown}("respiration, photosynthesis")` and are involved in the synthesis of `color{brown}("DNA and RNA. ")`

● `color{violet}("Magnesium")` is a constituent of the ring structure of `color{brown}("chlorophyll")` and helps to maintain the ribosome
structure.

● `color{violet}("Plants")` obtain sulphur in the form of `color{brown}("sulphate" (SO )_4^(2−))` .

● `color{violet}("Sulphur")` is present in two amino acids – `color{brown}("cysteine and methionine")` and is the main constituent of several coenzymes, vitamins (`color{brown}("thiamine, biotin, Coenzyme A)")` and `color{brown}("ferredoxin.")`