Name the essential element that is considered a component of energy-related chemical compounds like chlorophyll.

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 of the following is correctly matched?

Which of the following is a micro-element in plants?

Write the importance of $Zn^{2+}$ and $Cu^{2+}$ in plants.

For the structure of chlorophyll,plants require .........