Question

Which of the following does NPK denote ?
(a) Nitrogen, Potassium, Kinetin
(b) Nitrogen, Protein, Kinetin
(c) Nitrogen, Protein, Potassium
(d) Nitrogen, Phosphorus, Potassium

Answer 1

The three nutrients that compose complete fertilizers, nitrogen, phosphorus and potassium stand for NPK.

• Nitrogen - a macro-nutrient helps in growth, metabolism and abundance of foliage.  
• Phosphorus - a macro-nutrient plays a key role in energy metabolism.
• Potassium - a macro-nutrient helps in opening and closing of stomata and even acts an activator of many enzymes.

Answer 2

The required "option d) Nitrogen, Phosphorus, Potassium" is correct.

Explanation:

The three nutrients that compose complete fertilizers, nitrogen (N), phosphorus(P) and potassium(K) stand for NPK.

Nitrogen : A macro-nutrient helps in growth, metabolism and abundance of foliage.  

Phosphorus : A macro-nutrient plays a key role in energy metabolism.

Potassium : A macro-nutrient helps in opening and closing of stomata.

NPK denote Nitrogen, Phosphorus, Potassium.

Thus, the required "option d) Nitrogen, Phosphorus, Potassium" is correct.