Natural resources are materials and energy we get from nature. They split into renewable (replenished faster than used) and non-renewable (fossil fuels, minerals). CBSE Class 9 covers this as environmental science.
Core Concepts
Types of resources
Renewable — sunlight, wind, water, forests, wildlife, biomass. Non-renewable — coal, petroleum, natural gas, metals. Some ‘renewable’ resources can be depleted if used faster than replenished.
The critical distinction: renewable does not mean infinite. Forests are renewable but deforestation can destroy them faster than regrowth. Groundwater is renewable but over-extraction in Punjab and Rajasthan has lowered water tables dramatically. The rate of use must not exceed the rate of replenishment.
| Category | Examples | Regeneration Time | Indian Context |
|---|---|---|---|
| Inexhaustible | Solar, wind, tidal | Continuous | Growing solar capacity |
| Renewable (biological) | Forests, fish, wildlife | Years to decades | Under pressure from population |
| Renewable (water) | Rivers, groundwater | Seasonal to centuries | Monsoon-dependent, over-extracted |
| Non-renewable (fossil) | Coal, oil, gas | Millions of years | Coal dominant, oil imported |
| Non-renewable (mineral) | Iron, copper, aluminium | Geological timescale | Rich in iron, limited in others |
Water resources
Freshwater is only about 2.5% of Earth’s water, and most is locked in ice. India gets 80% of rainfall in four monsoon months. Rainwater harvesting, watershed management and efficient irrigation are key strategies.
India’s water crisis in numbers:
- India receives about 4000 billion cubic metres of rainfall annually
- Only about 1000 billion is usable (the rest runs off or evaporates)
- Per capita water availability has dropped from 5177 cubic metres (1951) to about 1500 (present)
- Below 1700 cubic metres per capita is defined as “water stress”
Traditional water conservation in India:
- Rajasthan: Khadins (earthen embankments to capture runoff), johads (check dams)
- Tamil Nadu: Eris (tank systems connected to rivers)
- Karnataka: Keres (village tanks for irrigation)
- Gujarat: Stepwells (vav) for groundwater access
- Meghalaya: Bamboo drip irrigation for betel leaf
CBSE loves questions on traditional water conservation. Know at least two Indian traditional methods with their state. This is a reliable 2-mark question.
Forest resources
Forests provide timber, fuel, fruit, fodder, medicinal plants, and ecosystem services like carbon storage and watershed protection. Chipko movement in Uttarakhand (1970s) is a classic Indian conservation story.
Why forests matter beyond timber:
- Carbon sequestration (each hectare of forest absorbs about 10 tonnes of CO2 per year)
- Watershed protection (tree roots hold soil, prevent erosion, recharge groundwater)
- Biodiversity hotspot (India has about 8% of world species on 2.4% of land area)
- Livelihoods (over 300 million Indians depend directly on forests)
Deforestation causes: Agriculture expansion, urbanisation, mining, road building, commercial logging, forest fires. India has been increasing forest cover in recent decades through afforestation programmes, but quality of forest (primary vs planted) matters as much as quantity.
Key conservation milestones:
- Chipko Movement (1973): Women in Uttarakhand hugged trees to prevent logging. Led to a ban on commercial felling in Himalayan forests.
- Joint Forest Management (1990s): Government and local communities manage forests together. Communities get non-timber forest products; in return, they protect the forest.
- National Forest Policy: Aims for 33% forest cover (currently about 24%).
Energy resources
Non-renewable — coal (still dominant in India), oil, natural gas, nuclear. Renewable — solar, wind, hydro, geothermal, biomass. Transition to renewables is a current priority.
India’s energy mix: Coal provides about 55% of India’s electricity. Solar and wind together now provide about 12% and growing fast. India aims for 500 GW of renewable capacity by 2030.
Fossil fuels — formation and limitation:
- Coal: ancient plant matter compressed over 300 million years. Finite reserves, major source of CO2 and air pollution
- Petroleum: marine organisms compressed under sedimentary rock. India imports about 85% of its oil needs
- Natural gas: often found with petroleum. Cleaner than coal but still produces CO2
Renewable alternatives:
- Solar: India gets about 300 sunny days per year in most regions. Solar panel costs have dropped 90% in the last decade
- Wind: coastal and hilltop areas in Gujarat, Tamil Nadu, Karnataka, Rajasthan
- Hydroelectric: Himalayan rivers provide significant potential. Large dams controversial due to displacement and ecological damage
- Biomass: biogas from cattle dung is a traditional village energy source
3 R principle
Reduce, reuse, recycle — the basic conservation strategy. Reduce is the most effective; recycle is the last resort.
Why the order matters:
- Reduce: Using less means fewer resources extracted, less pollution, less waste. Carrying a cloth bag instead of buying plastic bags each time.
- Reuse: Using the same item multiple times without processing. Refilling a water bottle instead of buying new ones.
- Recycle: Processing waste into new products. Melting aluminium cans to make new ones. Requires energy and creates some waste, so it is the least efficient of the three.
Biodiversity and conservation
India is a megadiversity country — one of 17 countries that together hold 70% of the world’s species. We have 4 of the 36 global biodiversity hotspots: Western Ghats, Eastern Himalayas, Indo-Burma, and Sundaland.
In-situ conservation: Protecting species in their natural habitat. National parks (Corbett, Kaziranga, Ranthambore), wildlife sanctuaries, biosphere reserves.
Ex-situ conservation: Protecting species outside their habitat. Zoos, botanical gardens, seed banks, gene banks, captive breeding programmes.
Worked Examples
India has high rainfall but most runs off unused. Simple rooftop collection in a village like Ralegan Siddhi (Maharashtra) turned water-scarce land into a model of self-sufficiency.
Coal has been cheap but externalities are huge — air pollution, CO2, health costs. Solar has become cheaper than coal for new plants in India since 2020. Economics is now favouring renewables.
Launched in 1986 to clean the Ganga. But sewage from growing cities continued to outpace treatment capacity. Industrial effluents were poorly regulated. The lesson: conservation requires both technical solutions and enforcement of regulations.
Producing 1 kg of wheat requires about 1500 litres of water. Producing 1 kg of beef requires about 15,000 litres. This is why diet choices are also resource choices. Reducing meat consumption conserves water resources.
Common Mistakes
Calling coal renewable. It is non-renewable — takes millions of years to form.
Saying water is infinite. Freshwater is finite and unevenly distributed.
Writing that recycle is the best conservation strategy. Reduce is the best; recycle is a backup.
Confusing in-situ and ex-situ conservation. National parks are in-situ (protecting in natural habitat). Zoos are ex-situ (outside natural habitat).
Saying renewable energy has no environmental impact. Wind turbines affect bird migration, solar farms use large land areas, and hydroelectric dams alter river ecosystems. Renewable is better than fossil, but not impact-free.
Exam Weightage and Revision
Natural Resources is tested in CBSE Class 9 (3-5 marks) and Class 10 (3-5 marks). Questions focus on the 3Rs, water conservation methods, forest conservation movements, and renewable vs non-renewable classification. NEET may include ecology-related questions on conservation.
| Question Type | CBSE Frequency | Marks |
|---|---|---|
| 3R principle | Every year | 2 |
| Traditional water conservation | Most years | 2-3 |
| Renewable vs non-renewable | Every year | 2 |
| Conservation movements (Chipko) | Every 2 years | 2-3 |
| In-situ vs ex-situ conservation | Occasional | 2 |
Two reliable questions: “What is the 3R principle?” (answer with examples — cloth bags for reduce, refilling bottles for reuse, paper recycling for recycle) and “Name two traditional water harvesting methods in India” (any two from the list above with their states).
Practice Questions
Q1. Why is groundwater depletion a serious problem in India?
India is the world’s largest user of groundwater, extracting more than China and the US combined. Overextraction lowers the water table, making wells go dry. Recharge depends on rainfall (seasonal, limited to 4 months) and takes years. In states like Punjab and Rajasthan, the water table has dropped several metres. Once aquifers are depleted, recovery takes decades.
Q2. Distinguish between renewable and non-renewable resources with two examples each.
Renewable resources are replenished naturally within a human lifetime: solar energy (continuous), forests (regrow in decades). Non-renewable resources take millions of years to form and are effectively finite: coal (formed from ancient plants over 300 million years), petroleum (formed from marine organisms). The key difference is the rate of formation vs the rate of consumption.
Q3. Why was the Chipko movement significant for Indian conservation?
The Chipko movement (1973, Chamoli district, Uttarakhand) was significant because: (1) it was a grassroots movement led by local women, not scientists or politicians, (2) it demonstrated that local communities have the deepest stake in forest conservation, (3) it led to a 15-year ban on commercial tree felling in Himalayan forests, (4) it inspired similar movements across India and globally.
Q4. Why is reducing more effective than recycling?
Reducing means using less in the first place — no resources extracted, no energy spent on production, no waste generated. Recycling requires collection, transportation, processing (which uses energy and may produce pollution), and the recycled product is often lower quality than the original. For example, not buying a plastic bottle saves 100% of the resources; recycling it recovers only about 30-50% and still uses energy.
FAQs
Why can India not simply switch to solar energy immediately?
Solar power is intermittent (no sun at night, less on cloudy days). Energy storage (batteries) is expensive. The existing coal infrastructure represents huge investments. Grid stability requires a mix of baseload (coal, nuclear) and variable (solar, wind) sources. The transition is happening but will take decades.
What is sustainable development?
Development that meets present needs without compromising the ability of future generations to meet their own needs. It balances economic growth, environmental protection, and social equity. Using resources at a rate that allows natural regeneration is the core principle.
Is nuclear energy renewable?
Technically no — uranium is a finite resource. But the amount of energy per kg of uranium is enormous (about 2 million times that of coal), so available reserves can last centuries. Nuclear is classified as a low-carbon energy source, not renewable.
Memorise 3R order — reduce, reuse, recycle. One-mark questions on this are almost guaranteed.
Resources are the base on which civilisation runs. Every policy debate — climate, food, energy — is a resources question under the surface.