Pick the odd one out. (analyze)

Water collected from the river is made free of large pieces of dirt and pumped into reservoirs, then passed to ____________ tank, which helps in forming lumps of particles for their easy removal. (analyze)

• First of all large wastes are removed from water in sewage water treatment.
• Then it is passed to flocculation tanks from water reservoirs to remove impurities in the form of lumps of particles.

Analyze the process of water purification in which water is passed through a filter bed to remove all insoluble impurities. (analyze)

• Filter bed used in water purification have high absorbing and adsorbing capacity.
• It purify the water by removing all insoluble impurities of water.

The various stages of cleaning wastewater in a sewage treatment plant are as follows. Select the stages in chronological order. (create)
A. Wastewater goes to a grit and sand removal tank.
B. The water is allowed to settle in a large tank which is sloped towards the middle.
C. Air is pumped into the clarified water to help aerobic bacteria to grow.
D. Wastewater is passed through bar screens. Large objects like plastics, cans, rags, sticks, napkins, etc., are removed.

• Aerobic bacteria helps to remove smallest waste particles from water as they feed on that.

The water we drink in our homes is usually contaminated with suspended pollutants like_____________. (analyze)

• Our drinking water contains so many pollutants in it like clay, slit and sand particles.
• To clean or purify the water in some homes , filters are used like R.O.

Water filtration is an/a _________________ that enables access to cleaner water with less costs of water purification. (understand)

Biome is:

Observe the image and choose the correct statement.

The goby fish and the almost blind shrimp spend the majority of their time together. This shows _________.