Q. The most abundant intracellular cation is :
(a) K+
(b) Na+
(c) Ca2+
(d) H+
Solution :
Correct option : C K+ is the most abundant intracellular cation involved in nerve conduction and maintenance of membrane potential. It is also required for muscle contraction. Also, plants require K+ for stomatal opening and closing activities. During photosynthesis, potassium is transported from the epidermal cell to the guard cell in order for the stomata to open and close. It also helps in fluid and electrolyte balance.