Chapter 13 · Question 9

What are the problems caused by non-biodegradable waste? Explain different methods of waste disposal. How can individuals contribute to reducing the waste management problem?

Answer Revealed

Direct Answer:

Non-biodegradable waste causes persistent land and water pollution, harm to animals (ingestion or entanglement), soil contamination, release of hazardous materials from electronic waste, and contributes to biological magnification when toxic chemicals enter food chains. Plastics clog drains and create breeding grounds for disease vectors. Waste disposal methods include: segregation into biodegradable and non-biodegradable (at source), composting of biodegradable waste, recycling of non-biodegradable materials (plastics, metals, glass), proper landfill management, and treatment of sewage before discharge. Individuals can help by: carrying reusable cloth bags instead of plastic, segregating waste at home, reducing use of disposable items, composting kitchen waste, walking or cycling instead of using vehicles, and switching off unnecessary lights and fans.

Simple Explanation

Non-biodegradable waste — especially plastic — never really goes away. It piles up in landfills, clogs drains, and ends up in oceans where sea animals mistake it for food. Electronic waste leaks toxic chemicals into soil and water. We all waste a lot — but small changes help: carry a cloth bag when shopping instead of taking plastic ones, separate wet and dry waste at home, avoid single-use disposable cups and straws, and compost your kitchen scraps. At the big-picture level, waste should be sorted, recycled when possible, and only the rest sent to properly managed landfills.

Exam-Ready Structure

The problem of waste disposal is one of the two major environmental challenges highlighted in NCERT Class 10 Chapter 13, alongside ozone depletion. The chapter connects individual behaviour, community action, and systemic solutions. 1. Problems caused by non-biodegradable waste: (a) Persistence: These substances do not decompose and remain in the environment for decades to centuries — plastic bags can last 500+ years. (b) Land pollution: Accumulation in landfills and open dumps degrades land quality and aesthetics. Heaps of garbage are now common sights in cities, towns, and tourist spots. (c) Water pollution: Plastics and other non-biodegradable wastes wash into water bodies, harming aquatic ecosystems. (d) Harm to animals: Stray animals and marine life ingest plastic or become entangled, often fatally. (e) Soil and groundwater contamination: Hazardous materials from electronic waste (heavy metals from batteries and circuit boards) leach into soil and groundwater. (f) Clogging of drains: Plastic waste blocks drainage systems, leading to water stagnation and breeding of mosquitoes and other disease vectors. (g) Biological magnification: Non-biodegradable pesticides and chemicals enter food chains and concentrate at higher trophic levels. 2. Methods of waste disposal and management: (a) Segregation at source: Separating biodegradable and non-biodegradable waste at the household and institutional level before collection. Activity 13.7 asks students to investigate how their local municipality or panchayat deals with waste. (b) Composting: Biodegradable waste (kitchen waste, garden waste) can be converted into manure through controlled decomposition. NCERT Activity 13.5 demonstrates this by burying waste in a pit and observing decomposition. (c) Recycling: Non-biodegradable materials like plastics, glass, metals, and paper can be collected, processed, and remade into new products. Activity 13.9 asks students to research how plastics are recycled and the environmental impact of the recycling process. (d) Sanitary landfilling: Non-recyclable, non-biodegradable waste that cannot be composted is compacted and buried in engineered landfills designed to prevent leaching into soil and groundwater. (e) Sewage treatment: Activity 13.8 asks students to investigate how sewage in their locality is treated to ensure that untreated sewage does not pollute local water bodies. (f) Industrial waste treatment: Industries must have mechanisms to treat their waste before discharge to prevent soil and water pollution. 3. Individual contribution — NCERT Chapter 13 lists several environment-friendly practices: (a) Carrying cloth/jute bags for shopping instead of accepting plastic bags. (b) Switching off unnecessary lights and fans to save energy. (c) Using public transport, walking, or cycling instead of private vehicles to reduce pollution. (d) Reducing consumption of single-use disposable items. (e) Segregating household waste into biodegradable and non-biodegradable categories. (f) Composting kitchen and garden waste at home. 4. The 'Think it over' section on disposable cups in trains illustrates the complexity — paper cups replaced plastic cups, but the earlier alternative of clay cups (kulhads) was rejected because their mass production would deplete fertile topsoil. There is no single easy answer; waste management requires balancing multiple environmental factors.

Key Points

Non-biodegradable waste persists, pollutes land/water, harms animals, clogs drains, and contributes to biological magnification
Electronic waste contains hazardous materials (heavy metals) that contaminate soil and groundwater
Waste disposal methods: segregation at source, composting of biodegradable waste, recycling, sanitary landfilling, sewage treatment
Individuals can: use cloth bags, segregate waste, avoid disposables, compost, save energy, walk/cycle
The disposable cup example shows waste management involves trade-offs — paper cups replaced plastic, but clay cups were rejected due to topsoil depletion

Common Mistakes

Thinking that all waste can be composted or recycled — some non-biodegradable waste must go to engineered landfills
Assuming biodegradable waste has no environmental impact — even biodegradable waste in large quantities can pollute water bodies (eutrophication) and produce methane if improperly managed

What are the problems caused by non-biodegradable waste? Explain different methods of waste disposal. How can individuals contribute to reducing the waste management problem?