Which of the following is one of the component of ATP?
a)	Potassium	b)	Phosphorus	c)	Magnesium	d)	Manganese

(b)

Phosphorus.

Essential elements can be grouped into four broad categories on the basis of their diverse functions

(i) Essential elements that acts as a components of biomolecules and hence, structural elements of cells ( carbon, hydrogen, oxygen and nitrogen)

(ii) Essential elements that are components of energy-related chemical compounds in plants

(iii) Essential elements that activates or inhibits enzymes

(iv) Some essential elements can alter the osmotic potential of a cell