Question

Non-essential element in the plant is
A. Barium
B. Magnesium
C. Potassium
D. Calcium

Answer 1

Hint: An element is said to be essential for plants if, without that element, plants are unable to complete their life cycle, and this element is directly involved in a number of plant functions, if these essential elements are needed in large quantities for plants, then it is a macronutrient, and if it is required in small quantities, then it is called a micronutrient.

Complete answer: Plants require sunlight, water and other necessary elements for photosynthesis. There are primarily 20 essential elements for plants. If they have the following characteristics, the element is called the critical element. In order to complete its life cycle, various elements are required for the plant. The critical element cannot be replaced by any other element. The purpose of the element is very important in order to obtain nutrition. Carbohydrate is generated through a process called photosynthesis which requires a great number of carbons, hydrogen and oxygen.

Macro element	Microelement
Carbon	Manganese
Hydrogen	Iron
Oxygen	Boron
Nitrogen	Molybdenum
Phosphorus	Copper
Potassium	Zinc
Calcium	Chlorine, nickel
Magnesium	Cobalt, Sodium
Sulphur	Silicon

Essential mineral elements include magnesium, potassium, and calcium. An essential constituent of chlorophyll is magnesium. In the movement of guard cells and enzyme activity, potassium is essential. The formation of the cell wall in plants requires calcium. These three are essential macronutrients. Whereas barium does not play an important role, it is thus a non-essential element in plants.
Hence, the correct answer is option A.

Note: Deficiency of some of the essential elements in plants, particularly macronutrients, can cause so many adverse effects, including stunted development, or some slow growth, and may display chlorosis, sometimes under extreme conditions, that there may be signs of cell death.