Discussion
About half of the essential plant nutrients are macronutrients; among which __________ is foremost vital to form carbohydrates, proteins, nucleic acids and other compounds.
Answer: C
The nutrient is Carbon.
Carbon, taken in as carbon dioxide through photosynthesis, forms the backbone of every organic compound in the plant: carbohydrates, proteins, fats and nucleic acids. Together with hydrogen and oxygen it makes up most of a plant's dry weight.
Nitrogen is essential for proteins and nucleic acids but is not part of carbohydrates, and sulphur is found only in certain amino acids and proteins. Sodium is not an essential nutrient for most plants. The word carbohydrates is what points to carbon.
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