Environmental Studies · General Awareness

Water Quality and Pollution

1,303 Questions

Water Quality and Pollution examines the sources, mechanisms, and impacts of contaminants in aquatic ecosystems. It covers crucial environmental concepts like eutrophication, biochemical oxygen demand, and thermal pollution. This subject frequently appears in general science and environmental studies sections of various examinations.

Eutrophication CausesThermal Pollution EffectsBiochemical Oxygen DemandSynthetic Fertilizer ImpactsWastewater SourcesAquatic Ecosystem Toxicity

Water Quality and Pollution Questions

Multiple choice economics environment pollution strategies to control environmental pollution strategies to control pollution strategies to control environmental pollution and green chemistry

The treated water has a very low level of organic material and suspended matter. It is discharged into __________.

  1. sea

  2. a river or into the ground
  3. both $A$ and $B$

  4. none of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Industrial wastewater treatment describes the processes used for the treatment of wastewater that is produced by industries as an undesirable by-product. After treatment, the treated industrial wastewater (or effluent) may be reused or released to a sanitary sewer or to a surface water in the environment.

Multiple choice evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

Slimy, green patches in ponds or in stagnant water is

  1. Fungi

  2. Bryophytes

  3. Bacteria

  4. Algae
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

One of the simplest multicellular organisms is algae. They are seen growing in the freshwater of marine habitats. They are also eukaryotic organisms. Algae can grow rapidly when exposed to stagnant waters. An adequate amount of sunlight, temperature and aquatic habitat leads to the rapid growth of slimy, green patches containing chlorophyll called algae.


So, option D 'Algae' is the correct answer.

Multiple choice evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

Algae are important, we should study algae because

  1. They are easiest to experiments with.

  2. They can be grown in large tank cultures.

  3. They may form important constituent of human food (diet) in future.

  4. They produce oxygen and organic acids.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Algae are important as primary producers of organic matter at the base of the food chain. They also provide oxygen for other aquatic life. Algae may contribute to mass mortality of other organisms, in cases of algal blooms, but they also contribute to economic well- being in the form of food, medicine and other products. In tropical regions, coralline algae can be as important as corals in the formation of reefs. They may form important constituent of human food (diet) in future. In future when world population will be very much, to provide them all nutritious food, algae will be used as alternate source of energy.

Multiple choice evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

What are algae helpful for?

  1. Turbidity

  2. Hydrography

  3. Self Purification

  4. Decomposition
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Algae have become significant organisms for self purification of wastewater since they are able to accumulate plant nutrients, heavy metals, pesticides, organic and inorganic toxic substances and radioactive matters in their cells or bodies.

Therefore C is the correct option. 

Multiple choice zoology classification of living beings hierarchy of classification different types of classifications introduction to classification of living organisms

Water is the second most important factor influencing life of organisms because  

  1. it makes major part of an organism's body

  2. productivity of plants depend upon availability of water

  3. life on Earth originated in water

  4. Both (a) and (b)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Water makes the major part of an organism's life next to temperature. It s an important factor which influences the life of organisms. The productivity and distribution of land plants are dependent upon availability of water. Water is required for growth and development of plants. 

Multiple choice biology food components and nutrition need for nutrients nutrition and its deficiency nutrition and its need

Water is important for the functioning of body as

  1. It releases energy

  2. It has buffering action

  3. Kills microorganisms

  4. It is a very good solvent
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Water present in the human body supports the metabolic reactions in the body. The enzymes which act as a catalyst in these biological reaction acts efficiently in presence of water. The salts like sodium and potassium which dissolves in the water act as a transporter as it is a very good solvent. These help in the transmission of the nerve impulse. It helps to maintain a constant temperature inside the body. It also helps in cellular processes like endocytosis and exocytosis. It helps to maintain osmotic condition inside the cell.

So, the correct answer is option D.

Multiple choice zoology pollution - a rising environmental problem sources of water pollution marine life water pollution

Sewage ............ BOD of water.

  1. Increases

  2. Decreases

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sewage contains the highest amount of carbonic materials and biological materials as pollutants. It increases the number of decomposers like bacteria and fungus. The acceleration of microbial activity increases BOD of water.

So, the correct answer is option A.

Multiple choice zoology pollution - a rising environmental problem sources of water pollution marine life water pollution

Which of the following algae is responsible to develop a bad taste in drinking water?

  1. Diatoms (Golden-brown algae)

  2. Brown algae

  3. Green algae

  4. Blue green algae
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The foul odor and taste of the drinking water is due to geosmin and methylisoborneol that are organic compounds produced by blue-green algae. Thus the correct answer is option D.

Multiple choice zoology pollution - a rising environmental problem sources of water pollution marine life water pollution

Which among the following organisms is known as polluted water indicator?

  1. Tubifex

  2. E.coli

  3. Chironomus larvae

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Water pollution is the major cause of several chronic diseases. The potable water must be treated to get rid of certain harmful microorganism. Daphnia, trout fishes, and larvae of stone flies are the example of fresh water indicator and tubifex, E. Coli, sewage fungus, sludge worms, blood worms are the indicator of polluted water.

So, the correct answer is option D.

Multiple choice zoology pollution - a rising environmental problem sources of water pollution marine life water pollution

Select the correct statement regarding water pollution.

  1. A change in the temperature of water bodies

  2. A change in the pressure of water bodies

  3. The removal of desirable substance from water bodies

  4. Addition of undesirable substance to water bodies
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Addition of undesirable substances to water and removal of desirable substances from it is termed as water pollution. But the addition of harmful substances causes a very harmful effect leading to water pollution. For example, the addition of industrial smoke, effluents, washing dirty clothes, bathing, sewage waste, etc causes water pollution.

So, option D is the correct answer.

Multiple choice zoology pollution - a rising environmental problem sources of water pollution marine life water pollution

Which one of the following is a fresh water indicator organism?

  1. Tubifex

  2. Daphnia

  3. Sludge worm

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Water pollution is the major cause of several chronic diseases. The potable water must be treated to get rid of certain harmful microorganism. Daphnia, trout fishes, and larvae of stoneflies are the example of freshwater indicator and tubifex, E. Coli, sewage fungus, sludge worms, blood worms are the indicator of polluted water.

So, the correct answer is option B.