What is the full form of chemical fertiliser, N.P.K.?
A)Nitrogen, Phosphorus and Calcium
B)Nitric Acid, Phosphorus and Calcium
C)Nitrogen, Phosphorus and Potassium
D)Nitric Acid, Phosphorus and Potassium

Hint - NPK is a chemical fertiliser. It is used to improve production of crops. The N, P and K nutrients are constituents of proteins and nucleic acids and therefore are essential for plant growth.

Complete Step by Step Answer - The full form on N.P.K. is Nitrogen, Phosphorus and Potassium. They are three of the fourteen essential plant nutrients( nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg) and sulfur (S). Micronutrients are Manganese (Mn), Boron (B), Copper (Cu), Iron (Fe), Zinc (Zn), Nickel (Ni), Molybdenum (Mo) and Chlorine (Cl).) N.P.K. is a type of chemical fertiliser. Chemical fertilisers are a modern agricultural technique. They were introduced on a large scale in India along with HYV seeds and modern methods of irrigation with the onset of the Green Revolution in the 1960s in the states of Punjab, Haryana and Western Uttar Pradesh. They were used to increase food grain production so India could achieve food security and not be dependent on other countries for imports. Chemical Fertilisers are synthetic compounds used to facilitate plant growth and increase crop yield. Since land is a fixed asset, increasing the area under agriculture to increase production is difficult, hence techniques like chemical fertilisers are used to increase crop yield in limited land.
OPTION A - Nitrogen, Phosphorus and Calcium is not the composition of N.P.K. fertiliser.
OPTION B - Nitric Acid, Phosphorus and Calcium is not the composition of N.P.K. fertiliser.
OPTION C - The composition of N.P.K. is Nitrogen, Phosphorus and Potassium.
OPTION D - Nitric Acid, Phosphorus and Potassium is not the composition of N.P.K.

Note - The full form of N.P.K. is Nitrogen, Phosphorus and Potassium. It is a type of chemical fertiliser. Chemical fertilisers are synthetic compounds used to increase crop yields.