Unlimited exploitation of nature by man disturbed the delicate ecological balance between the living and non-living components of the biosphere. The unfavourable conditions created by man himself threatened the survival not only of him but also of the entire living organisms on the mother earth. Rehan is an active member of 'Eco club' of his school which is creating environmental awareness amongst the school students, spreading the same in the society and also working hard for preventing environmental degradation of the surroundings. As part of this awareness programme, they are explaining the importance of using different dustbing for biodegradable and non-biodegradable wastes. Generally green duslbing are for biodegradable wastes and blue for non-biodegradable wastes.
In the following groups of materials, which group(s) contains only non-biodegradable items?
(I) Wood, paper, leather
(II) Polythene, detergent, PVC
(III) Plastic, detergent, grass
(IV) Plastic, bakelite, DDT

Options

A. (III)
B. (IV)
C. (I) and (III)
D. (II) and (IV)

Explanation

To determine which groups contain only non-biodegradable items, we need to analyze each group of materials provided in the question.

### Step-by-Step Solution:

1. **Understanding Biodegradable and Non-Biodegradable Waste**:
- **Biodegradable Waste**: This type of waste can be decomposed by living organisms such as bacteria and fungi. Examples include food scraps, paper, and garden waste.
- **Non-Biodegradable Waste**: This waste cannot be easily decomposed by living organisms and remains in the environment for a long time. Examples include plastics, metals, and certain chemicals.

2. **Analyzing Each Group**:
- **Group I: Wood, Paper, Leather**
- Wood and paper are biodegradable. Leather can be considered biodegradable to some extent but takes a long time to decompose. Thus, this group contains biodegradable items.

- **Group II: Polythene, Detergent, PVC**
- Polythene (plastic) is non-biodegradable. Detergent is also generally considered non-biodegradable. PVC (polyvinyl chloride) is a type of plastic that is non-biodegradable. Therefore, this group contains only non-biodegradable items.

- **Group III: Plastic, Detergent, Grass**
- Plastic is non-biodegradable. Detergent is also non-biodegradable. However, grass is biodegradable. Thus, this group contains both biodegradable and non-biodegradable items.

- **Group IV: Plastic, Bakelite, DDT**
- Plastic is non-biodegradable. Bakelite is a type of plastic that is also non-biodegradable. DDT (dichloro-diphenyl-trichloroethane) is a pesticide that is non-biodegradable. Therefore, this group contains only non-biodegradable items.

3. **Conclusion**:
- The groups that contain only non-biodegradable items are **Group II (Polythene, Detergent, PVC)** and **Group IV (Plastic, Bakelite, DDT)**.

### Final Answer:
The correct groups that contain only non-biodegradable items are **Group II and Group IV**.

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