The 'A' coloured bins are used to dump biodegradable solid waste while the recyclable left-over are to be dumped in 'B' coloured bins. Identify 'A' and 'B' :

Question

Accepted Answer

Explanation:

1. **Correct Answer Justification (Option 4: A → Green, B → Blue):**

- **Biodegradable Waste (A → Green):** Green bins are universally recognized for collecting biodegradable waste. This includes organic materials like food scraps, garden waste, and other materials that can decompose naturally. The green color is often associated with nature and the environment, making it an intuitive choice for biodegradable waste.
   
   - **Recyclable Waste (B → Blue):** Blue bins are commonly used for recyclable materials. This includes items like paper, plastic, glass, and metals that can be processed and reused. The blue color is widely accepted for recycling purposes, symbolizing cleanliness and sustainability.

2. **Explanation of Incorrect Options:**

- **Option 1 (A → Blue, B → Green):** This option incorrectly assigns blue bins for biodegradable waste and green bins for recyclables. Blue is not typically used for organic waste, and green is not standard for recyclables, making this option incorrect.
   
   - **Option 2 (A → Green, B → Black):** While the green bin for biodegradable waste is correct, black bins are generally used for non-recyclable or general waste, not specifically for recyclables. Therefore, this option is incorrect for the purpose of recycling.
   
   - **Option 3 (A → Blue, B → Black):** This option incorrectly uses blue for biodegradable waste and black for recyclables. As mentioned, blue is not standard for organic waste, and black is not used for recyclables, making this option incorrect.

In conclusion, Option 4 is the correct choice because it aligns with the widely accepted color coding for waste management, where green is used for biodegradable waste and blue for recyclable materials.