A. Aquatic plants
B. Penicillin
C. Micro-organisms
D. Fishes
Related Mcqs:
- BOD value of sewage water than that of tap water is:
A. More
B. Less
C. Equal
D. Somewhere more somewhere less - As compared to tap water the BOD of sewage polluted water shall be:
A. High
B. Low
C. Same
D. None of these - Sewage drained into water bodies kills fishes because:
A. It gives off a bad small
B. It removes the food eaten by fishes
C. It increases the competition with fishes for dissolved oxygen
D. Excessive CO2 is added to water - A lake with an inflow of domestic sewage rich in organic waste may result in:
A. Drying of the lake very soon due to algal bloom
B. An increased production of fish due to lot of nutrients
C. Increased population of aquatic food web organisms
D. Death of fish due to lack of oxygen - When excess of sewage is dumped in the river, its BOD:
A. Increases
B. Slightly decreases
C. Remains unchanged
D. Decreases drastically - When a big fish eats a small fish, which easts water-fleas supported by phytoplankton, the water leas are:
A. Primary consumers
B. Producers
C. Secondary consumers
D. Top consumers in this food chain - The soils that are fully laden with water i.e., water logged, are known are:
A. Physically dry soils
B. Physiologically dry soils
C. Alkaline soils
D. Acidic soils - When a soil has been thoroughly wetted and then allowed to drain until capillary movement of the water has stopped, the water content of the soil will give an estimate of it’s:
A. Gravitational water
B. Capillary water
C. Field capacity
D. Storage capacity - Water-logging is a serious problems, with water-table within _____ over the greater part of the area:
A. 5m
B. 6m
C. 7m
D. 8m - The importance of watershed management was realized when Pakistan signed Indus Water Treaty with India through which right of water of ______ was given to India while Pakistan has the right on river Indus and Jhelum:
A. Chenab
B. Ravi
C. Sutlij
D. All of the above
The correct answer to the question: "Sewage water can be purified for recycling with the action of:" is "Micro-organisms ".