1. Water is essential for life and supports all living organisms, but it can become polluted from various human and natural sources. 2. Microorganisms play important roles in water, including as primary producers, decomposers, and indicators of water quality. Phytoplankton, zooplankton, periphyton, benthos, and saprotrophic bacteria and fungi are some of the main types of microorganisms found in water. 3. Water pollution occurs when waste disposal or other human activities change the physical or chemical properties of water, making it unsuitable for uses like drinking, agriculture, or recreation. Sources of water pollution include industrial, domestic, agricultural, and mining activities.

1. MICROORGANISMS & WATER POLLUTION MAJID MOHIUDDIN

5. Ocean Polar Ice Caps Glaciers Ice fields Inland surface water – Lakes and River

6. Ocean – 97% of the Hydrosphere .

7. Polar ice caps Ice fields Glaciers 2% in the form of ice

8. Inland surface water 0.02% Lake River

10. Atmospheric water Rain water & Snow water (dust, soot & suspended particles & Air borne bacteria)

11. Surface water: Mountain, river water also. (organic matter, Soil microflora). Saprophytic Spp. & Protozoa . Mountain water River water

12. Ground water: Water percolates (few bacteria & little amount of organic matter). (Microbes cannot multiply)

13. Stored water Pond Reservoirs Lakes Ocean

23. Periphytons

25. Phytobenthos- Benthic Plants

26. Phytobenthos- Benthic Plants

27. Zoobenthos – Benthic Animals