$A$ plant requires magnesium for

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

Boron takes part in

Calcium gets accumulated in which of the following?

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.

Which group represents micronutrients?