Q.Why is urban waste a serious problem in India ? Explain one reason.

The question asks why slums are described as areas of residence with least choice. The key idea is that "least choice" means residents have no real alternative — they are compelled to live in conditions that lack basic necessities and dignity. Any option that describes a deficiency or deprivation supports this; any option that describes a facility or improvement contradicts it.

Let’s examine each statement:

1. Statement (i): "They have dilapidated houses with poor ventilation."

   This is a clear sign of poor housing quality. Residents do not choose such conditions voluntarily — they are forced by poverty or lack of affordable housing. This supports the idea of least choice.

2. Statement (ii): "The basic facilities like lights and toilets are difficult to get."

   Lack of access to electricity and sanitation is a hallmark of slum life. Again, no one would willingly choose such deprivation. This also supports the idea.

3. Statement (iii): "Hygienic conditions and drinking water are improper."

   Unsafe water and poor hygiene are serious health hazards. Residents endure these because they have no better option. This too supports the idea.

4. Statement (iv): "Better drainage facilities are available." …

Urban waste management is one of the most pressing environmental challenges in India today. As cities grow, the sheer volume of waste generated every day puts immense pressure on municipal services, land, and public health. Solid waste, in particular, refers to any discarded material that is not liquid or gaseous — essentially, anything we throw away that is solid in form. This includes household rubbish, commercial refuse, industrial scrap, and even biodegradable matter like leaves and food scraps.

Now, look at the options given. Kitchen discarded items — vegetable peels, leftover food, eggshells — are solid waste. Polythene bags, which clog drains and choke landfills, are also solid waste. Plant leaves and branches, whether from gardening or natural shedding, are solid waste too. Old newspapers, which we often sell to a scrap dealer or give to the waste collector, are another classic example of solid waste.

Acid rain is a direct consequence of air pollution. When we burn fossil fuels — coal, oil, petrol — in factories, power plants, and vehicles, they release gases like sulphur dioxide and nitrogen oxides into the air. These gases rise high into the atmosphere, where they react with water vapour, oxygen, and sunlight. This chemical reaction turns them into sulphuric acid and nitric acid. When it rains, these acids come down with the raindrops, making the rain acidic — hence the name "acid rain."

So the root cause is not something on the ground like garbage or sewage. Land pollution (A) involves solid waste and chemicals dumped on soil, but those don't rise into the sky to form acid rain. Water pollution (B) is about contaminants in rivers, lakes, and oceans — again, not airborne. Noise pollution (D) is about sound, which has nothing to do with chemistry in the clouds. …

Part (a)

Urban waste is a serious problem in India mainly because the volume of solid waste generated by fast-growing, densely populated cities greatly exceeds the capacity of municipal systems to collect, transport and process it. A key reason is the absence of segregation at source: wet (biodegradable) waste is mixed with dry recyclables and hazardous material, so it cannot easily be recycled or composted. The mixed waste ends up in overflowing open dumps and poorly managed landfills, where organic matter decomposes to release methane (a greenhouse gas) and toxic leachate that seeps into soil and groundwater. Waste also clogs drains and becomes a breeding ground for mosquitoes and rats, spreading disease.

Part (b) …

Part (a)

Air pollution affects human health mainly by being breathed in. The respiratory system is hit first: polluted air irritates and inflames the airways, causing coughing, wheezing and breathlessness, and it triggers or worsens asthma, bronchitis and chronic lung diseases. Fine particulate matter (PM2.5) is especially dangerous because it penetrates deep into the lungs, and long-term exposure raises the risk of lung cancer. The cardiovascular system is also affected — fine particles entering the bloodstream cause inflammation, hardening of the arteries and higher blood pressure, increasing the risk of heart attacks and strokes, while carbon monoxide reduces the blood's oxygen-carrying capacity. In addition, pollutants cause eye and throat irritation, headaches and fatigue. Children, the elderly and people with existing heart or lung conditions suffer the most.

Part (b) …