Boron in green plants assists in

With the help of examples,describe the classification of essential elements based on the function they perform.

Calcium works as a catalyst for:

What is the primary role of micronutrients in living organisms?

Mark the statements as true/false by choosing the correct option from the set $(I-IV)$ given below:
$I.$ Magnesium is a constituent of chlorophyll and helps to maintain the ribosome structure.
$II.$ Calcium is needed during the formation of mitotic spindle.
$III.$ Magnesium is essential for the photolysis of water.
$IV.$ Zinc helps in sugar translocation.

Minerals which maintain cation-anion balance in cells are