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The uniqueness of Plants is they can absorb nutrients and water through their roots as well as they can fix atmospheric carbon dioxide. Soil quality and climate conditions are the major factors for plant growth and distribution. All the essential elements and nutrients are required along with water and sunlight for the proper growth of plants.

The essential elements can be categorized into two major groups: macronutrients and micronutrients. Nutrients that are required in larger amounts for plant growth are considered macronutrients. Carbon, nitrogen, phosphorus, oxygen, calcium, hydrogen, magnesium, potassium, and sulfur are considered macronutrients. Plants use these elements in larger amounts. Carbon is an essential element that is present in major macromolecules like proteins, carbohydrates, and nucleic acids.

Therefore, the correct answer is option ‘b’.

Carbon is present in macromolecules like protein, carbohydrates, and nucleic acids.