Biotechnology is applied in the?

Step 1: Analyze the question The question asks where biotechnology is applied. Biotechnology is the use of living organisms (such as bacteria, fungi and enzymes) or their products to make useful products or solve problems.

Step 2: Explain the concept Biotechnology relies on biological processes. Common examples include:

• Making bread, yoghurt, wine, and beer (fermentation)
• Producing antibiotics and insulin
• Genetic engineering of crops
• Treating sewage with microorganisms that break down organic waste (biological or "activated sludge" treatment)

Step 3: Evaluate the options

• A. Treatment of sewage: Correct. Bacteria and other microbes decompose the organic matter in sewage, which is a classic application of biotechnology.
• B. Treatment of water: Water treatment mostly uses physical and chemical methods such as filtration, coagulation with alum, and chlorination. These are not primarily biotechnology, although this option is the closest distractor.
• C. Purification of chemicals: This uses methods like distillation, crystallization, and chromatography, which are not biological.
• D. Purification of metals: This uses processes like electrolysis and smelting, which are chemical or physical.

Step 4: Answer The correct option is A. treatment of sewage.

Exam tip: When you see "biotechnology," think of living organisms doing the work: fermentation, enzymes, microbes, and genetic engineering. Sewage treatment is a standard example because microbes digest the waste. Water treatment typically uses chemicals like chlorine, so don't confuse the two.