Tag: environmental use of microorganism

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Questions Related to environmental use of microorganism

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. 

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

In secondary treatment, solid reducers, ranges from

  1. 70-92%

  2. 80-90%

  3. 20-60%

  4. 10-70%
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Secondary treatment typically removes 70-92% of solids and BOD (Biochemical Oxygen Demand) from wastewater. The lower range (70-80%) represents less efficient systems, while well-operated plants achieve 85-92% removal.

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

Secondary treatment is also known as ________________.

  1. Biological Treatment

  2. Preliminary Treatment

  3. Secondary Treatment

  4. Tertiary Treatment
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Secondary treatment is known as biological treatment because it relies on aerobic bacteria and other microorganisms to consume organic waste.

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

Which of these is not a key factor that helps in the process of decay?

  1. Wind

  2. Temperature

  3. Water

  4. Micro-organisms
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Decay is what happens when dead animals and plants break down. The key factors involved in decay are: Temperature, Amount of oxygen, Amount of water and the presence of microorganisms. Microorganisms are important in decay. For example, they are used to break down human waste (sewage) and plant waste (compost). Decay recycles important nutrients for plant growth.

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

Air pollution is caused by transport exhaust fumes and emission of gases like $SO 2$, $CO _, NO _2$ from industries. Similarly, water pollution is caused by ____________.

  1. Sewage

  2. Crop cultivation

  3. Rain

  4. Soil erosion
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Water pollution is primarily caused by the discharge of untreated or partially treated sewage, which introduces organic waste and pathogens into water bodies.