Which of the following is NOT an agro-based industry?

The correct answer is Fertiliser.

To understand why, let us first define what an agro-based industry is.

An agro-based industry is one that uses agricultural produce as its primary raw material. In other words, the industry depends directly on crops, plants, or other farm outputs to manufacture its products.

Now let us examine each option:

1. Sugar Industry
Raw material: Sugarcane (an agricultural crop)
Sugarcane is harvested from farms and directly processed in sugar mills to extract sugar. ✔ This IS an agro-based industry.

2. Edible Oil Industry
Raw material: Oilseeds such as groundnut, mustard, sunflower, soybean (all agricultural crops)
These seeds are grown on farms and then crushed/processed to extract edible oil. ✔ This IS an agro-based industry.

3. Jute Industry
Raw material: Jute plant (an agricultural crop grown in fields)
Jute fibres are obtained from the jute plant and used to make ropes, bags, and textiles. ✔ This IS an agro-based industry.

4. Fertiliser Industry
Raw materials: Chemicals and minerals such as nitrogen (from natural gas/coal), phosphate rock, and potassium salts.
Fertilisers are manufactured through chemical processes using industrial/mineral inputs — not agricultural produce.
The fertiliser industry is classified as a chemical-based industry, not an agro-based one.
✘ This is NOT an agro-based industry.

Key Distinction:
Agro-based industries consume agricultural output as input.
The fertiliser industry actually supplies inputs to agriculture — it does the reverse. Its raw materials come from chemical and mineral sources, making it a mineral/chemical-based industry.

Therefore, among the given options, Fertiliser is the one that is NOT an agro-based industry.