UPSC Static Quiz – Environment : 18 November 2025

Solution: D

The Fishing Cat is an indicator species, meaning its presence reflects the health of wetland ecosystems. Its conservation is crucial for maintaining ecological balance in these habitats.

About Fishing Cat:

• Scientific Name: Prionailurus viverrinus
• Habitat: Found in wetlands, swamps, mangroves, and marshy areas; prefers oxbow lakes, reed beds, and tidal creeks.
• Characteristics:
  • Skilled swimmer, often dives to catch fish.
  • Nocturnal predator; feeds on fish, frogs, crustaceans, and small mammals.
  • Breeds year-round; muscular, short tail with 6-7 dark bands.
• IUCN Status: Vulnerable
• Significance in Ecology: Acts as an indicator species for wetland health and plays a vital role in balancing aquatic ecosystems.

Solution: B

Coringa Wildlife Sanctuary in Andhra Pradesh is known for its dense mangrove forests, which provide a thriving habitat for species like the endangered Fishing Cat.

About Coringa Wildlife Sanctuary (CWS):

• Location: In the Godavari estuary, where the Coringa River meets the Bay of Bengal in Kakinada district, Andhra Pradesh.
• Unique Features:
  • India’s second-largest mangrove forest.
  • Habitat for endangered species like the Fishing Cat, Indian smooth-coated otter, and Olive Ridley turtles.
  • Rich biodiversity including mangroves and unique fauna like the Brahminy kite and black-capped kingfisher.
  • Contains Hope Island, a natural barrier protecting the sanctuary from direct sea erosion.

Solution: B

Statement 3 is incorrect.

Incineration involves controlled combustion to reduce waste volume and recover energy. However, it is less effective for wet waste, which has lower calorific efficiency.

About Incineration:

• What it is: Incineration is the controlled combustion of waste in high-temperature furnaces to reduce volume, neutralize hazardous materials, and recover energy.
• Procedure:

• • Combustion: Waste is burned at temperatures exceeding 850°C for complete destruction of toxins.
  • Energy Recovery: Heat from combustion generates steam, which powers turbines for electricity production.
  • Exhaust Gas Cleaning: Advanced systems like scrubbers and bag house filters remove harmful pollutants from emissions.
  • Ash Residue Handling: Bottom ash is recycled or landfilled, while fly ash is treated with chemicals before disposal.

• Advantages:

• • Energy Generation: Produces electricity and heat from waste combustion.
  • Space-Saving: Reduces landfill dependency in densely populated areas.
  • Pollution Control: Modern systems ensure minimal environmental impact by capturing emissions.
  • Resource Recovery: Produces materials like paving bricks and activated carbon.
  • Safe Disposal: Effectively neutralizes hazardous materials.

• Limitations:

• • Harmful Emissions: Releases dioxins, furans, and other toxins if not properly maintained.
  • Health Risks: Linked to respiratory issues and carcinogenic effects near poorly managed plants.
  • Air and Water Pollution: Residual ash and flue gases can contaminate the environment.
  • High Costs: Advanced incinerators require significant investment and maintenance.
  • Inefficiency with Moisture: Wet waste in India reduces calorific efficiency.

Solution: B

Statement 3 is incorrect.

Crop rotation and cover cropping minimize nitrate leaching by improving soil health. Reverse osmosis effectively removes nitrates from water, but constructed wetlands reduce nitrate levels through natural filtration processes.

About Nitrate:

• What it is: A naturally occurring nitrogen compound essential for biological processes, but harmful in excess.
• Sources:

• • Natural Sources: Soil organic matter decomposition.
  • Anthropogenic Sources: Overuse of synthetic nitrogen fertilizers, improper sewage disposal, and livestock waste.

• Causes of Nitrate Contamination:

• • Agriculture: Leaching of fertilizers into groundwater.
  • Poor Waste Management: Improper disposal of human and animal waste.
  • Industrial Effluents: Discharge of untreated nitrogen-rich wastewater.

• Impacts of Nitrate Contamination:

• • Health Hazards:
    1. Causes methemoglobinemia (blue baby syndrome) in infants.
    2. Linked to cancer, reproductive issues, and endocrine disorders.
  • Environmental Toxicity:
    1. Disrupts aquatic ecosystems through eutrophication.
    2. Contributes to soil degradation and water toxicity.

• State-Wise Contamination: Rajasthan (49%), Karnataka (48%), Tamil Nadu (37%).

Solution: A

Statement 1 is correct: By planting native species, the technique creates habitats that attract birds, insects, and other fauna, thereby supporting biodiversity.

Statement 2 is correct: Dense planting improves soil health and promotes water retention, aiding groundwater recharge.

Statement 3 is incorrect: While the technique is environmentally beneficial, soil preparation may involve fertilizers and treatments that do not necessarily lower the carbon footprint.

About Miyawaki Technique:

• What it is: A method developed by Japanese botanist Akira Miyawaki in the 1970s to create dense, fast-growing forests by mimicking natural ecosystems.

• Often referred to as the ‘pot plantation method’, it involves planting trees and shrubs close to one another to accelerate their growth.

• Features:
  • Dense Planting: Plants are placed close together using native species.
  • Accelerated Growth: Trees grow 10 times faster than in traditional forests.
  • Soil Restoration: Enhances soil fertility and promotes natural regeneration.
  • Biodiversity Boost: Supports a wide variety of flora and fauna.
• Significance:
  • Urban Reforestation: Converts barren and polluted lands into green spaces.
  • Environmental Benefits: Reduces air and water pollution, absorbs more carbon, and lowers temperatures by 4-7°C.
  • Sustainability: Prevents soil erosion and promotes ecological balance, contributing to long-term environmental restoration.