Both essential elements
Macronutrients: needed in large amounts
Micronutrients: needed in small amounts
There are nine essential elements called macronutrients because plants require them in
relatively large amounts. The remaining eight essential elements are known as
micronutrients because plants need them in very small amounts.
5. Name the nine macronutrients required by plants.
Forming structure of a plant: oxygen, hydrogen, nitrogen, and phosphorus, sulfur
Used within the plant: potassium, calcium, and magnesium
The first six elements are carbon, oxygen, hydrogen, nitrogen, phosphorus, and sulfur, the
major components of organic compounds forming the structure of a plant. The other three
macronutrients are potassium, calcium, and magnesium, which are for other uses within
the plant itself.
6. List the eight micronutrients required by plants and explain why plants need only
minute quantities of these elements.
Chlorine, iron, manganese, boron, zinc, copper, nickel, molybdenum
Used in small amounts
Function in plants as cofactors, non-protein helpers
Too much present, reaction catalyzed and disrupts balance
These eight elements are chlorine, iron, manganese, boron, zinc, copper, nickel, and
molybdenum, which are only needed in small amounts because they function in plants
mainly as cofactors, non-protein helpers in enzymatic reactions. If there is too much of an