These are biodegradable wastes such as food waste, garden waste, animal waste and human waste that can undergo biological degradation under controlled conditions and can be turned into compost.

• A. Compostable wastes
• B. Residual wastes
• C. Recyclable wastes
• D. Special wastes

Answer: (A)

The idea being tested is how certain organic wastes are processed into useful soil amendments through controlled biological activity. These materials—food scraps, yard trimmings, animal manures, and even human waste in some systems—are organic enough that microorganisms can break them down when kept in the right conditions (moisture, temperature, aeration, and time). When managed properly, this biodegradation yields compost, a nutrient-rich material that can improve soil structure and fertility. That makes them compostable wastes, the best fit for the description.

Residual wastes are what remains after resources are recovered and do not imply an intentional biological breakdown into compost. Recyclable wastes are materials that are collected to be reprocessed into new products, not necessarily biodegraded. Special wastes cover hazardous or regulated materials requiring special handling, which isn’t the focus here.