Match List I with List II List I (Pollution Source) List II (Category) A. Sewage I. Thermal Pollution B. Agriculture fertilizers II. Sediments C. Land Erosion III. Oxygen demanding waste D. Power Plants IV. Plants Nutrients
Choose the correct answer from the options given below:
Understanding Pollution Sources and Categories
The question asks us to match different sources of pollution with their appropriate categories. Pollution is the introduction of contaminants into the natural environment that cause adverse change. Different activities lead to different types of pollution.
Matching Pollution Sources to Categories
Let's analyze each pollution source provided in List I and match it with the most suitable category from List II based on the type of pollutant they primarily introduce into the environment.
- Sewage: Sewage primarily contains organic waste from households and industries. When this organic waste decomposes in water bodies, it consumes dissolved oxygen. This depletion of oxygen harms aquatic life. Therefore, sewage is categorized as an Oxygen demanding waste.
- Agriculture fertilizers: Fertilizers contain nutrients like nitrates and phosphates. When these fertilizers run off from agricultural fields into water bodies, they act as nutrients for algae and aquatic plants, leading to excessive growth (eutrophication). This makes agriculture fertilizers a source of Plants Nutrients pollution.
- Land Erosion: Land erosion, often caused by deforestation or poor land management, washes away soil particles into rivers, lakes, and other water bodies. These suspended soil particles settle down as layers, leading to Sediments pollution.
- Power Plants: Many power plants, especially thermal power plants, use large amounts of water for cooling. This heated water is often discharged back into rivers or lakes, increasing the water temperature. This increase in temperature is known as Thermal Pollution.
Based on this analysis, the correct matching is:
- A. Sewage → III. Oxygen demanding waste
- B. Agriculture fertilizers → IV. Plants Nutrients
- C. Land Erosion → II. Sediments
- D. Power Plants → I. Thermal Pollution
Let's summarize this in a table format for clarity.
| List I (Pollution Source) | List II (Category) | Match |
|---|---|---|
| A. Sewage | I. Thermal Pollution | A → III |
| B. Agriculture fertilizers | II. Sediments | B → IV |
| C. Land Erosion | III. Oxygen demanding waste | C → II |
| D. Power Plants | IV. Plants Nutrients | D → I |
Confirming the Matches
Comparing our derived matches with the options, we look for the option that shows A-III, B-IV, C-II, and D-I.
Revision Table: Key Pollution Concepts
| Pollution Source | Primary Pollutant/Effect | Pollution Category |
|---|---|---|
| Sewage | Organic matter, microorganisms | Oxygen demanding waste, Biological pollution |
| Agriculture Fertilizers | Nitrates, Phosphates | Plant Nutrients (leading to Eutrophication) |
| Land Erosion | Soil particles, Silt | Sediments, Turbidity |
| Power Plants (Thermal) | Heated water | Thermal Pollution |
Additional Information on Pollution Categories
Understanding different pollution categories helps in identifying sources and devising control measures. Here is a bit more detail:
- Oxygen demanding waste: Organic pollutants that consume dissolved oxygen in water during decomposition by microorganisms (e.g., sewage, food waste). A high biological oxygen demand (BOD) indicates significant organic pollution.
- Plant Nutrients: Excess nutrients, primarily nitrogen and phosphorus compounds, that stimulate excessive growth of aquatic plants and algae. This process, called eutrophication, degrades water quality, reduces dissolved oxygen, and harms aquatic ecosystems (e.g., fertilizers, detergents, sewage).
- Sediments: Solid material, such as soil, silt, and sand, washed into water bodies from land erosion, construction sites, or mining. Sediments increase turbidity, reduce light penetration, bury aquatic habitats, and transport other pollutants.
- Thermal Pollution: The increase or decrease in the temperature of a natural water body caused by human activity, typically the discharge of heated water from power plants or industrial processes. Changes in water temperature affect dissolved oxygen levels and the metabolic rates and survival of aquatic organisms.
- Thermal Pollution: The increase or decrease in the temperature of a natural water body caused by human activity, typically the discharge of heated water from power plants or industrial processes. Changes in water temperature affect dissolved oxygen levels and the metabolic rates and survival of aquatic organisms.
Important Questions from People
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In the light of the above statements, choose the most appropriate answer from the options given below :
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