Question

The macronutrient which is an essential component of all organic compounds, yet not obtained by plants from soil is

• A. Nitrogen
• B. Carbon
• C. Phosphorus
• D. Magnesium

Hint:

Carbon is the macronutrient which is an essential component of all organic compounds and is not obtained by plants from the soil.

Answer 1

The Correct Option is B

Carbon, oxygen, and hydrogen are known as the basic elements of a living organism - particularly carbohydrates, proteins, lipids, and nucleic acids. 
Carbon is the macronutrient that is an essential component of all organic compounds and is not obtained by plants from the soil. Instead, plants obtain carbon from carbon dioxide (CO₂) in the air through the process of photosynthesis. During photosynthesis, plants convert light energy from the sun into chemical energy stored in the form of organic compounds such as sugars, starches, and cellulose.
Hence, option B) Carbon is the correct answer.

Answer 2

A macronutrient named 'Carbon' is an essential component of all organic compounds. Plants obtain carbon in the form of carbon dioxide (CO₂) from the atmosphere, not from the soil.

Answer 3

‘Carbon’ is the macronutrient which is essential for all organic compounds, as the organic compound are compounds made of carbon, hydrogen, and oxygen. Carbon is obtained from the atmosphere in the form of CO_2,​ not from the soil.