Why do plants need potassium and magnesium?

Why do plants need potassium and megnesium?

Small clay particles hold calcium, potassium and magnesium ions because surfaces of clay particles are

Permanent hardness of water is due to the presence of (1) bicarbonates of sodium and potassium (2) bicarbonates of sodium and potassium (3) chlorides and sulphates of calcium and matgnesium. (4) bicarbonates of calcium and magnesium. (5) phosphates of sodium and potassium

Why is Na atom bigger than the atoms of both lithium and magnesium ?

Why are potassium and cesium, rather than lithium used in photoelectric cells?

Why are potassium and cesium, rather than lithium used in photoelectric cells?

Explain the significance of sodium, potassium, magnesium and calcium in biological fluids.

Questions carrying two marks : Beryllium and magnesium do not give colour flame whereas other alkaline earth metals do so,why?

Why do plants of legume family contain more protein than other plants?