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 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

Common indicator organism of water pollution is?

  1. Salmonella typhi

  2. Entamoeba histytic

  3. Vibrio cholera

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

Escherichia coli is a coliform bacterium commonly found in the lower intestine of warm-blooded organisms. Its presence in water samples serves as the standard indicator organism for fecal contamination and water pollution.

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.

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

The amount of biodegradable organic matter in sewage water can be estimated by measuring

  1. Biochemical Oxygen Demand (BOD)

  2. The growth of anaerobic bacteria in water

  3. Biogeological oxygen demand

  4. The growth of aerobic bacteria in water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Biochemical oxygen demand is the measure of oxygen required by aerobic decomposers for biochemical degradation of the organic materials. BOD indicates the degree of organic pollutants present in water.

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

Industrial, municipal sewage, treatment plants are examples of

  1. Diffused sources

  2. Point Sources

  3. Stationary Sources

  4. Line Sources
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Point sources of pollution are identifiable, localized sources such as pipes or specific treatment plant outlets. In contrast, diffused or non-point sources are spread out over a large area.

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

Which is the most common source of eutrophication?

  1. Industrial effluent

  2. Textile effluent

  3. Sewage water

  4. Both B and C
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Contamination of water reservoir with sewage water leads to increased level of phosphate in water. Due to increased level of phosphate algae starts growing on it. This decreases the dissolved oxygen level in water thus all the aquatic lives can't survive and leads to mortality. This is called eutrophication.

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

I. Sewage water treatment plants are setup for controlling water pollution.
II. BOD level increases after sewage treatment.

  1. I and II are true

  2. I and II are false

  3. I is true and II is false

  4. I is false and II is true
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sewage treatment constitutes of 3 stages primary, secondary and tertiary. BOD i.e biological oxygen demand decreases during secondary stage. This makes water permissible to let into natural water resources.

Multiple choice rivers - means of livelihood evs

The water plant called Eichhornia which reduces the dissolved _________ leading to the death of the water organisms, animals and plants.

  1. Nitrogen

  2. Oxygen

  3. Hydrogen

  4. Carbon Dioxide
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Eichhornia crassipes, commonly known as common water hyacinth, is an aquatic plant native to the Amazon basin and is often a highly problematic invasive species outside its native range. When not controlled, water hyacinth will cover lakes and ponds entirely which affects water flow and blocks sunlight from reaching native aquatic plants which often die. The decay processes deplete dissolved oxygen in the water, often killing fish (or turtles).

Multiple choice evs water in our life where do we get water from? why conserve water uses of water

Estuaries are considered as nutrient trap due to the mixing of

  1. River and sea water

  2. Pond and lake

  3. Lake and river

  4. Ocean and pond
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Estuaries are areas where freshwater from rivers meets and mixes with saltwater from the ocean, creating a nutrient-rich environment that acts as a trap for sediments and organic matter.

Multiple choice chemistry environmental chemistry biochemistry and the environment green chemistry strategies to control environmental pollution and green chemistry

$Statement\ I-$ Algal blooms, caused by phosphates, are beneficial to aquatic ecosystems.
BECAUSE
$Statement\ II-$ Algal blooms are associated with rapidly increasing rates of photosynthesis which lead to dissolve oxygen content in the water leading to much higher than normal levels.

  1. Statement $I$ is true, Statement $II$ is true
  2. Statement $I$ is true, Statement $II$ is false
  3. Statement $I$ is false, Statement $II$ is true
  4. Statement $I$ is false, Statement $II$ is false
  5. Statement $I$ is true, Statement $II$ is true and is correct explanation of the phenomena described in $I$
Reveal answer Fill a bubble to check yourself
C Correct answer