Kitchen Waste Disposal: Biodegradable MCQs Quiz | Class 9
This multiple-choice quiz for Class 9 Home Science (Code 064), Unit VI: Resource Management, covers the important topic of Kitchen Waste Disposal. You will be tested on concepts like composting, vermicomposting, biogas, and bagasse. Answer all questions, submit your quiz, and download your personalized answer sheet PDF.
Understanding Biodegradable Kitchen Waste Disposal
Proper disposal of biodegradable kitchen waste is crucial for maintaining hygiene, reducing landfill burden, and creating valuable resources. When organic waste like fruit and vegetable peels, leftover food, and eggshells decomposes in landfills, it produces methane, a potent greenhouse gas. By managing this waste at home through methods like composting, we can turn it into a resource that benefits our environment.
Key Methods of Waste Management
1. Composting
Composting is a natural process of recycling organic matter into a rich soil conditioner called compost. Microorganisms like bacteria and fungi break down the organic waste. A good compost pile requires a balance of:
- Greens (Nitrogen-rich): Vegetable scraps, fruit peels, coffee grounds, grass clippings.
- Browns (Carbon-rich): Dried leaves, twigs, cardboard, paper, sawdust.
- Water: The pile should be moist like a wrung-out sponge.
- Air (Oxygen): Turning the pile regularly introduces oxygen, which is essential for aerobic decomposition and prevents foul smells.
2. Vermicomposting
Vermicomposting is a specific type of composting that uses earthworms, typically red wigglers (Eisenia fetida), to decompose organic food waste. The worms eat the waste and excrete it as a highly nutritious end product called vermicast or worm castings. This process is faster than traditional composting and produces a very high-quality fertilizer that is excellent for garden plants.
3. Biogas Production
Biogas is produced through a process called anaerobic digestion, where microorganisms break down biodegradable material in an oxygen-free environment. A biogas plant is a sealed container where kitchen waste and water are fed. The decomposition produces biogas, which is primarily composed of methane (CH4) and carbon dioxide (CO2). This gas can be used as a clean fuel for cooking and lighting. The remaining slurry is a nutrient-rich organic fertilizer.
4. Bagasse
Bagasse is the dry, pulpy fibrous residue that remains after sugarcane or sorghum stalks are crushed to extract their juice. While not a typical kitchen waste product itself, it’s an important example of agricultural biodegradable waste management. Instead of being discarded, bagasse is used as a biofuel to produce electricity and steam in sugar mills. It is also used to make paper, building materials, and disposable tableware, offering a sustainable alternative to plastic and styrofoam.
| Feature | Traditional Composting | Vermicomposting |
|---|---|---|
| Decomposing Agent | Microorganisms (bacteria, fungi) | Earthworms and microorganisms |
| Time Taken | 2-6 months | 1-2 months |
| End Product | Compost | Vermicast (Worm Castings) |
| Nutrient Quality | Good | Excellent, very high quality |
Quick Revision Points
- Biodegradable waste can be converted into useful resources.
- Composting requires a balance of Carbon (‘browns’) and Nitrogen (‘greens’).
- Vermicomposting uses earthworms to create nutrient-rich vermicast.
- Biogas is mainly methane and is produced by anaerobic (oxygen-free) digestion.
- Bagasse is a byproduct of sugarcane processing used as biofuel and in manufacturing.
- Proper management of kitchen waste reduces landfill waste and greenhouse gas emissions.
Extra Practice Questions
- What is the ideal Carbon-to-Nitrogen (C:N) ratio for effective composting?
- Name two types of waste that should NOT be put in a home compost bin.
- Explain why a biogas plant is considered a source of renewable energy.
- What is the name of the liquid fertilizer produced as a byproduct in a biogas plant?
- List two environmental benefits of using bagasse for making disposable plates.
