Human Impact on Environment — Important Questions

Enrichment of water with nutrients causing algae growth

Step 1: Eutrophication occurs when excess fertilizers from agricultural fields mix with water bodies through surface runoff. Step 2: These fertilizers contain nutrients like nitrates and phosphates that act as plant food. Step 3: The enriched water triggers rapid growth of green algae, creating thick algae blooms. Step 4: When algae die and decompose, they consume dissolved oxygen in the water. Step 5: This oxygen depletion kills aquatic animals like fish, disrupting the entire water ecosystem.

Vegetable peels

Step 1: Biodegradable waste can be broken down by microorganisms into harmless substances naturally. Step 2: Vegetable peels are organic matter that bacteria and fungi can easily decompose. Step 3: They break down into nutrients that enrich the soil, completing the natural cycle. Step 4: Plastic bottles, aluminum cans, and glass containers are non-biodegradable - they don't decompose naturally. Step 5: These materials persist in the environment for many years, causing pollution and taking up landfill space.

Nitrogen oxides and sulfur dioxide reacting with water

Step 1: Acid rain forms when pollutant gases react with water vapor in the atmosphere. Step 2: Nitrogen oxides (from vehicle exhaust) and sulfur dioxide (from burning coal) are released into the air. Step 3: These gases react with water (H₂O) in clouds to form acids like nitric acid and sulfuric acid. Step 4: When it rains, these acids fall to Earth as acid rain with pH below normal. Step 5: Acid rain damages buildings, monuments, kills fish in water bodies, and harms forest trees by making soil acidic.

Timely cleaning of water channels and reservoirs

Step 1: Floods occur when rivers cannot contain high water flow due to inadequate capacity in river banks. Step 2: Cleaning and desilting water channels removes accumulated mud, debris, and waste that block water flow. Step 3: Clear channels allow rainwater to flow smoothly without overflowing onto land. Step 4: Regular maintenance of reservoirs ensures they can store excess water during heavy rainfall. Step 5: Building factories, cutting trees, and using pesticides actually worsen flood risks by reducing natural drainage and water absorption capacity.