An element is called as micro-essential which
A. Is less important than the major essential elements.
B. Is more important than the major essential elements.
C. Is present in very small quantities in the soil.
D. Is needed in very small quantities but is as important as major essential elements.

Hint: Plants need seventeen essential mineral elements. Depending on the amount required, it can be divided into two groups as macronutrients and micronutrients. Boron is an example of microelements.

Complete answer: Micronutrients are classified as elements that are needed by plants in very limited amounts but are significant elements. Nitrogen, boron, manganese, zinc, copper, etc. are some of the examples of these elements. Both macro and micronutrients are essential for the body. Macronutrients provide calories to the body, while micronutrients help the body perform various functions, such as metabolism. Proteins, carbohydrates are rich in macronutrients, while vitamins and minerals are examples of micronutrients. Examples of micronutrients are as follows:
Vitamins are important organic compounds for the body. They are classified as water-soluble and fat-soluble. Many vitamins are water-soluble and can be dissolved in water. These vitamins cannot be retained in the body. Fat-soluble vitamins are absorbed in fat, but not in water. These vitamins can be absorbed within the body and in the liver and fat tissues. Vitamins like A, D, E and K are fat-soluble vitamins. Minerals are classified into two groups as macrominerals and trace elements.
Therefore, the correct answer is option D.

Note: Micronutrients are important for the growth and development of plants and animals. Micronutrient deficiency can result in a variety of diseases. Vitamin and mineral deficiency in humans can cause diseases such as anaemia, rickets, mental retardation, goitre, vision problems, etc. Micronutrient deficiency in plants can lead to stunted growth, necrosis, chlorosis, etc.