Which among the following is the major constituent of proteins,nucleic acids,vitamins and hormones?

Which of the following is an essential mineral element that is not a constituent of any enzyme but stimulates the activity of many enzymes?

Which one of the following is $NOT$ an essential mineral element for plants?

How many elements have been found to be essential for plants?

Which element is present in the highest amount in plants?

State the importance of essential minerals in plants.