Wisconsin Master Gardener Practice Exam

Which symbol refers to the three primary plant nutrients essential for most plants?

NPK Macronutrients N-P-K Micronutrients

Correct Answer:

N-P-K

Explanation:

The main idea is recognizing the symbol that names the three primary plant nutrients nitrogen, phosphorus, and potassium. The hyphenated form N-P-K is the traditional way to indicate these three distinct elements together, making it clear that each nutrient is one of the trio essential for most plants. These three are the primary macronutrients, needed in larger amounts, and fertilizer labels often present them in a three-number sequence corresponding to N, P, and K. While the continuous form NPK is also used as shorthand for the same trio, the hyphenated version explicitly highlights the three separate nutrients. The other options point to broader categories rather than the specific symbol for the three essentials.

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