Environment includes all physical, chemical, and biological factors affecting organisms. Ecology studies relationships between organisms and their environment. The ecosystem is the basic functional unit where living (biotic) and non-living (abiotic) components interact
Biotic factors include plants, animals, microorganisms. Abiotic factors include air, water, soil, temperature, light
Producers → Primary Consumers → Secondary Consumers → Decomposers
Species Richness = Total number of species in an area. Higher biodiversity means greater ecosystem stability
Western Ghats, Eastern Himalayas, Indo-Burma region, and Sundaland
Air pollution causes respiratory diseases and acid rain. Water pollution leads to eutrophication and biomagnification. Soil pollution reduces fertility. Noise pollution affects hearing and mental health
Global warming causes sea level rise, glacier melting, extreme weather events. Greenhouse gases include CO2, CH4, N2O, and CFCs. Carbon footprint measures total greenhouse gas emissions.
SSC CGL frequently asks about National Parks, Wildlife Sanctuaries, endangered species, international environmental agreements, and pollution control measures. Questions often test specific locations, establishment years, and associated species.
#1: Remember HIPPO for biodiversity loss causes - Habitat destruction, Invasive species, Pollution, Population growth, Over-exploitation. Shortcut Trick #2: For greenhouse gases by warming potential: CO2 (1x) < N2O (300x) < CH4 (25x) < CFCs (10,000x).
Identify the species - One-horned rhinoceros is found in Assam
Connect to location - Kaziranga National Park in Assam
Additional facts - Established in 1974, UNESCO World Heritage Site Answer: Kaziranga National Park Worked Example 2: Question - Calculate BOD if 5mg oxygen is consumed by 2 liters of water sample.
Apply BOD formula - BOD = Oxygen consumed / Volume of sample
Substitute values - BOD = 5mg / 2L = 2.5 mg/L
Interpret result - BOD > 2mg/L indicates moderate pollution Answer: 2.5 mg/L Shortcut Trick #3: Environmental Laws memory trick - EPA (1986), Water Act (1974), Air Act (1981), Wildlife Act (1972). Remember chronologically: Wildlife → Water → Air → EPA.
#1: Students confuse National Parks with Wildlife Sanctuaries. Remember: National Parks have stricter protection, no human activity allowed. Wildlife Sanctuaries permit limited human activities like grazing.
Biosphere Reserves have three zones: core, buffer, and transition. Another frequent error is mixing up endangered species with their habitats. Always connect specific animals to their exact locations. For example, Asiatic Lions are only in Gir National Park, Gujarat, not in any other sanctuary. Conservation strategies include in-situ (within natural habitat) and ex-situ (outside natural habitat) methods.
In-situ includes National Parks and Sanctuaries. Ex-situ includes zoos, botanical gardens, and seed banks. Understanding these distinctions helps answer conservation-related questions accurately.
19graded MCQs · easy to hard · full solution & trap analysis