Question

Which of the following is a macronutrient?
A. Iron
B. Manganese
C. Boron
D. Calcium

Answer 1

Hint: Plants require nutrients for their proper physiological functioning. The nutrients can be divided into macro and micronutrients according to the amount of nutrients required and utilized by the plants. Each nutrient has its unique functions.

Complete answer:
Calcium is a macronutrient, which is essential for plants. The element has both structural and physiological functions. It is involved in the formation of the cell wall as well as the middle lamella. It promotes root formation as well as shoot elongation. The deficiency of calcium can result in evident symptoms since it is a macronutrient.
-Iron is a micronutrient since the amount of iron which is required by plants is less compared to that of macronutrients. It is also known as an essential micronutrient and is the micronutrient that is required in the highest quantity since it is of high importance in various plant metabolic processes as well as in DNA synthesis.
-Manganese is a micronutrient that is required in an amount lesser than that of Iron. It is also an essential micronutrient. The functions of the nutrient involve the germination of the pollen grain, the formation of the pollen tube, and the elongation of the root. Thus it is not a macronutrient.
-Boron is also a micronutrient. It is involved in cell division. It is also a component of the cell wall.
From the above-given options, the most appropriate option is D, that is Calcium is the macronutrient.

Note: The other macronutrients required by the plants are potassium, phosphorus, nitrogen, magnesium, and sulphur. The other required micronutrients are copper, molybdenum, zinc, and chlorine.