Question

The over use of NPK fertilizers:
A. Increases the protein content of wheat , maize, grams, etc.
B. The carbohydrate quality of such crops also becomes better.
C. Reduce the quantity of vegetables and crops grown on soil over the years.
D. Excess potassium content in soil increases vitamin C and carotene content in vegetables and fruits.

Answer 1

: NPK stands for "nitrogen, phosphorus, and potassium," the three nutrients that compose complete fertilizers. You may encounter these letters when reading the contents printed on bags of fertilizer. The description of the fertilizer may not expressly say "NPK," but you will at least see a series of three numbers.

Complete step by step answer:
The over use of NPK fertilizers reduce the quantity of vegetables and crops grown on soil over the years. It also reduces the protein content of wheat, maize, grams, etc., grown on that soil.
The carbohydrate quality of such crops also gets degraded. Excess potassium content in soil decreases Vitamin C and carotene content in vegetables and fruits.
The vegetables and fruits grown on over fertilized soil are more prone to attacks by insects and disease.

Hence correct option is (C)

Additional information:
A fertilizer or fertiliser is any material of natural or synthetic origin that is applied to soil or to plant tissues to supply one or more plant nutrients essential to the growth of plants. Many sources of fertilizer exist, both natural and industrially produced.

Note: Compared with the untreated plants, application of typical compound fertilizer (NPK) increased the plant height, leaf morphology, number of nodes and number of branches in the two species of Bellflower. But interestingly, the stem diameter and leaf color decreased with the application of NPK.