Ecology – Study Notes for Jharkhand Police Constable
General Awareness & Current Affairs
1. Simple Explanation
Ecology is the branch of biology that studies the relationships between living organisms (plants, animals, microorganisms) and their environment (air, water, soil, and other organisms). It looks at how these relationships maintain the balance of life on Earth.
- Ecosystem – a community of organisms plus their non‑living environment.
- Biodiversity – the variety of life forms in an ecosystem.
- Ecosystem services – benefits humans obtain (food, clean water, climate regulation, etc.).
- Ecological Footprint – the amount of natural resources required to sustain a person or a society.
2. Key Points
| Aspect | Details |
|---|---|
| Levels of Ecology | 1️⃣ Organisms → 2️⃣ Populations → 3️⃣ Communities → 4️⃣ Ecosystems → 5️⃣ Biosphere |
| Types of Ecosystems | Forest, grassland, wetland, desert, marine, freshwater, alpine, tundra |
| Energy Flow | Sun → Producers (plants) → Herbivores → Carnivores → Decomposers |
| Nutrient Cycle | Carbon, nitrogen, phosphorus, water cycles |
| Human Impact | Deforestation, pollution, over‑exploitation, climate change |
| Conservation Strategies | Protected areas, afforestation, sustainable resource use, legislation |
| Important Indices | • Shannon Diversity Index – measures species diversity • Ecological Footprint – compares resource demand vs. Earth’s capacity |
| Recent Indian Initiatives | • National Biodiversity Authority (NBA) – updating species lists • Forest Conservation Act (FCA) 1980 – regulating logging • National Mission on Sustainable Forest Management (NMSFM) – monitoring forest cover |
| Jharkhand‑Specific | • Bauxite mining – impacts on soil & water • Forest cover – ~31% of state area (National Forest Survey 2023) • Biodiversity hotspots – Chota Nagpur Plateau (rich in flora & fauna) |
3. Worked Example
Calculate the Ecological Footprint of a Household
Assumptions for a 4‑member family (average Indian household):
| Resource | Annual Consumption | Footprint per unit (m²/yr) | Household Footprint |
|---|---|---|---|
| Food | 2,500 kg (rice, pulses) | 0.15 m²/kg | 375 m² |
| Energy | 3,000 kWh electricity | 0.1 m²/kWh | 300 m² |
| Water | 500 m³ (household) | 100 m²/m³ | 50 m² |
| Transport | 10 km/day (car) | 0.05 m²/km | 18 m² |
Total Ecological Footprint = 375 + 300 + 50 + 18 = 743 m² per person per year
- World average ≈ 4,700 m²/person/yr.
- Implication: The household consumes ~16% of the average footprint, but still below the sustainable limit (~1,600 m²).
Use this example to understand how individual choices affect ecological balance.
4. Quick Revision Summary
- Ecology: Study of life‑environment interactions.
- Levels: Organisms → Populations → Communities → Ecosystems → Biosphere.
- Energy & Nutrient Cycles: Sun → Producers → Consumers → Decomposers.
- Biodiversity: Variety of species; measured by indices like Shannon.
- Human Impact: Deforestation, pollution, climate change.
- Conservation: Protected areas, legislation (Forest Act, NBA), sustainable practices.
- Recent Updates
- NBA’s updated species list (2024).
- State‑level forest cover 31% (2023).
- Bauxite mining impacts.
- Ecological Footprint: Quantifies resource demand; example calculation shown.
Tip for Exam:
- Remember: “Ecosystem” = living + non‑living; “Biodiversity” = species variety; “Footprint” = resource demand.
- Current Affairs: Cite NBA, FCA, and state forest statistics.
- Scenario Questions: Use the footprint example to explain sustainable living.
Good luck!