Tag: microbial pollution control

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Questions Related to microbial pollution control

Multiple choice zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

Activated sludge should have the ability to settle quickly so that it can:

  1. be rapidly pumped back from sedimentation tank to aeration tank

  2. absorb pathogenic bacteria present in wastewater while sinking to the bottom of the settling tank

  3. be discarded and anaerobically digested

  4. absorb colloidal organic matter.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The activated sludge have to settle quickly so that it can be pumped back to the aeration tank. So, the correct option is 'be rapidly pumped back from sedimentation tank to aeration tank'

Multiple choice zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

In the sewage treatment, bacterial flocs are allowed to sediment in a settling tank. This sediment is called as:

  1. inactivated sludge

  2. activated sludge

  3. primary sludge

  4. secondary sluge
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
In the secondary treatment, the effluent is passed into a settling tank where the bacterial flocs are allowed to sediment and the sediment is called activated sludge.
So, the correct option is 'activated sludge'
Multiple choice zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

The primary treatment of removal of:

  1. dissolved impurities

  2. stable particles

  3. toxic substances

  4. harmful bacteria
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The primary treatment involves physical removal of particles from the sewage through filtration and sedimentation. These are removed initially by sequential filtration which removes the floating debris and then grit is removed by sedimentation. 

So, the correct option is 'Option A' .

Multiple choice zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

Wastewater treatment generates a large quantity of sludge, which can be treated by:

  1. anaerobic digesters

  2. floc

  3. chemicals

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

Wastewater treatment generates a large quantity of activated sludge during secondary treatment which is used as a inoculum and a small part of it is pumped back to the large aeration tanks whereas the remaining part of that sludge is treated by anaerobic sludge digesters anaerobically. During this digestion, bacteria produces a mixture of gases called biogas. 

So, the correct option is 'Option A' .

Multiple choice zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

Activated sludge should have the ability to settle quickly so that it can

  1. Be rapidly pumped back from sedimentation tank aeration tank.

  2. Absorb pathogenic Bactria present in waste water while sinking to the bottom of the settling tank

  3. Be discarded and anaerobic ally digested

  4. Absorb colloidal organic matter
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Activated sludge should have the ability to settle quickly so that it can be rapidly pumped back from sedimentation tank to the aeration tank, where it can start the process of decomposition of the organic matter again. Activated sludge has filamentous bacteria that are capable of performing the aerobic digestion of organic waste is the sewage water.

Hence, the correct answer is 'Be rapidly pumped back from sedimentation tank aeration tank' 

Multiple choice zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

Waste water treatment generates a large amount of sludge, which can be treated by

  1. Anaerobic digesters

  2. Floc

  3. Chemicals

  4. Oxidation pond
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Anaerobic digestion is a collection of processes by which microorganisms break down biodegradable material in the absence of oxygen.
  •  The process is used for industrial or domestic purposes to manage waste and to produce fuels. 
  • Hence, Wastewater treatment generates a large amount of sludge, which can be treated by anaerobic digesters.
  • So, the correct answer is 'anaerobic digesters'.
Multiple choice zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

Chlorine treatment

  1. Removes all the air pollutants

  2. Disinfects water by killing germs

  3. Removes hardness of water

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

Chlorine is a powerful disinfectant that can kill the bacteria and viruses by destabilizing the chemical bonds of the pathogens. So, it is used in purification of water.

Hence, the correct answer is 'Disinfects water by killing germs'

Multiple choice zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

Which one is the most important role of microorganisms for the well being of humans?

  1. Sewage treatment

  2. Production of methane

  3. Conversion of milk to curd

  4. Biological control of plants disease
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Answer is option C i.e. "Conversion of milk to curd"

Microorganisms help in the production of many food items, making medicines, keeping the environment clean, in manufacturing and in research. 
Conversion of milk to curd is the considered as an important role in the micro organism for the well being of humans. . Bacteria like Lactobacillus can be used to make curd from milk by process of fermentation.

Multiple choice zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

Secondary treatment is carried out for removal of;

  1. Suspended solids

  2. Dissolved organic matters

  3. Floating materials

  4. Solid impurities
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Secondary sewage treatment is a biological process designed to remove dissolved organic matter by using microorganisms to break down the waste.

Multiple choice zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

Sewage water is purified for reuse by the action of

  1. Protozoans

  2. Micro-organisms

  3. Plants and light

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

Domestic sewage consists biodegradable organic matter and easily decomposes by the micro-organisms. These microorganisms can multiply using these organic substances as substrates and hence, utilize some of the components of sewage. Micro-organisms involved in biodegradation of organic matter in the receiving water body consume a lot of oxygen, and as a result, there is a sharp decline in dissolved oxygen downstream from the point of sewage discharge. This causes mortality of fish and other aquatic creatures. 

Thus, the correct answer is option B.