Reason of water pollution is

Correct option is D

The correct answer is all of the above
Water pollution occurs when harmful substances are introduced into water bodies, degrading water quality and harming aquatic life and human health. All three options listed—human activity, population growth, and pesticides—are major contributors to water pollution.
· Human activity: Includes industrial discharge, domestic sewage, plastic waste dumping, oil spills, and improper waste disposal. These introduce toxic chemicals, heavy metals, and non-biodegradable waste into rivers, lakes, and oceans.
· Population growth: Leads to increased demand for water, more sewage, higher waste generation, and overburdened sanitation infrastructure. Urbanization without proper waste management results in polluted water bodies.
· Pesticides: Chemicals used in agriculture often run off into nearby water sources during rainfall or irrigation, leading to chemical contamination that harms aquatic ecosystems and pollutes drinking water.
Information Booster:
· Polluted water is a major cause of waterborne diseases like cholera, typhoid, dysentery, and hepatitis A.
· Eutrophication occurs when nutrient-rich fertilizers and pesticides enter water bodies, causing algal blooms that deplete oxygen and kill aquatic life.
· Heavy metal pollution from industries includes elements like lead, mercury, arsenic, which accumulate in the food chain and affect human health.
Additional Knowledge:
· Human activity: Includes industrialization, deforestation, mining, and tourism.
· Population growth: Directly increases waste production and the strain on water systems.
· Pesticides: Include chemicals like DDT, malathion, and organophosphates, which are toxic to aquatic organisms.