Environmental Studies · General Awareness

Water Quality and Pollution

1,263 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 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.

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

Sewage infection of water will be demonstrated by cysts of

  1. Entameoba

  2. Escherichia coli

  3. Pseudomonas

  4. Leishmania
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Infective forms of Entameoba, a protozoan are often passed as cysts in the faeces and humans are infected when they ingest them through the source of sewage, non-treated drinking water, flies in water supply. 
So, the correct answer is option A.
Multiple choice zoology pollution - a rising environmental problem sources of water pollution marine life water pollution

With rise of water temperature, dissolved oxygen

  1. Remains unchanged

  2. Increases in amount

  3. Decrease in amount

  4. Is more available to aquatic organisms
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Oxygen is less soluble in warm water. Hence, as the water temperature increases the dissolved oxygen decreases.

So, the correct answer is 'Decrease in amount'.

Multiple choice chemistry water in our life how can we conserve water? droughts, floods and water conservation conservation of water and its importance and methods

Which of the following describes the effects of water scarcity on plants?

  1. The green character of the planet shall be lost.

  2. This may mean the end of all life.

  3. A world without plants shall mean no food, no oxygen, not enough rain, and innumerable other problems.

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

The following describes the effects of water scarcity on plants. The green character of the planet shall be lost. This may mean the end of all life, for a world without plants shall mean no food, no oxygen, not enough rain, and innumerable other problems.

Multiple choice biology wastewater story origin of waste products waste generation waste and its types

A lake with an inflow of domestic sewage rich in organic waste may result in

  1. Drying of the lake vary soon due to algal bloom

  2. An increased growth of fishes due to lot of nutrients

  3. Death of fish due to lack of oxygen

  4. Increased population of aquatic food web organisms
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The nutrients present in domestic sewage added in a lake will cause the dense growth of microbes, The microbes use oxygen and may deoxygenate the water which may lead to the death of the fish.