Question

Structural elements are

• A. Macro-mineral elements
• B. Micro-mineral elements
• C. Micro-non-mineral elements
• D. Macro-non-mineral elements

Answer 1

The correct option is D Macro-non-mineral elements

C, H and O are non-ionic elements called structural elements. They are obtained from $C{O}_2$and $H_{2}O$ that help in building the bulk dry mass (biomass) of the plant. They are macro-non-mineral elements as carbon and oxygen can be obtained by atmospheric $C{O}_2$and $H_{2}O$ from soil water.