The major portion of the dry weight of plants comprises of:
The major portion of the dry weight of plants comprises of:
nitrogen, phosphorus and potassium
calcium, magnesium and sulphur
carbon, nitrogen and hydrogen
carbon, hydrogen and oxygen
Solution
The four most common elements in living organisms are $\mathrm{H}, \mathrm{C}, \mathrm{O}, \mathrm{N}$. These are also known as framework element. Carbon, hydrogen and oxygen together constitute about $94 \%$ of the total dry weight of the plant.