Advertisements
Online Mock Tests
Chapters
2: Sexual Reproduction in Flowering Plants
3: Human Reproduction
4: Reproductive Health
5: Principle of Inheritance and Variation
6: Molecular Basis of Inheritance
7: Evolution
8: Human Health and Diseases
9: Strategies for Enhancement in Food Production
▶ 10: Microbes in Human Welfare
11: Biotechnology : Principles and Processes
12: Biotechnology and Its Applications
13: Organisms and Populations
14: Ecosystem
15: Biodiversity and Conservation
16: Environmental Issues
![NCERT Exemplar solutions for Biology Exemplar [English] Class 12 chapter 10 - Microbes in Human Welfare - Shaalaa.com](/images/biology-exemplar-english-class-12_6:436861273171423eb97769e06742bf93.png "NCERT Exemplar solutions for Biology Exemplar [English] Class 12 chapter 10 - Microbes in Human Welfare")
Advertisements
Solutions for Chapter 10: Microbes in Human Welfare
Below listed, you can find solutions for Chapter 10 of CBSE, Karnataka Board PUC NCERT Exemplar for Biology Exemplar [English] Class 12.
NCERT Exemplar solutions for Biology Exemplar [English] Class 12 10 Microbes in Human Welfare MULTIPLE CHOICE QUESTIONS [Pages 69 - 72]
The vitamin whose content increases following the conversion of milk into curd by lactic acid bacteria is ______.
vitamin C
vitamin D
vitamin B12
vitamin E
vitamin K
Wastewater treatment generates a large quantity of sludge, which can be treated by ______.
anaerobic digesters
floc
chemicals
oxidation pond
Methanogenic bacteria are not found in ______.
rumen of cattle
gobar gas plant
bottom of water-logged paddy fields
activated sludge
Match the following list of bacteria and their commercially important products:
| Bacterium | Product |
| A. Aspergillus niger | i. Lactic acid |
| B. Acetobacter aceti | ii. Butyric acid |
| C. Clostridium butylicum | iii. Acetic acid |
| D. Lactobacillus | iv. Citric acid |
Choose the correct match:
A - ii, B - iii, C - iv, D - i
A - ii, B - iv, C - iii, D - i
A - iv, B - iii, C - ii, D - i
A - iv, B - i, C - iii, D - ii
Match the following list of bioactive substances and their roles:
| Bioactive Substance | Role |
| A. Statin | I. Removal of oil stains |
| B. Cyclosporin A | II. Removal of clots from blood vessels |
| C. Streptokinase | iii. Lowering of blood cholesterol |
| D. Lipase | iv. Immuno-suppressive agent |
Choose the correct match:
A - ii, B - iii, C - i, D - iv
A - iv, B - ii, C - i, D - iii
A - iv, B - i, C - ii, D - iii
A - iii, B - iv, C - ii, D - i
The primary treatment of waste water involves the removal of ______.
dissolved impurities
stable particles
toxic substances
harmful bacteria
BOD of waste water is estimated by measuring the amount of ______.
total organic matter
biodegradable organic matter
oxygen evolution
oxygen consumption
Which one of the following alcoholic drinks is produced without distillation?
Wine
Whisky
Rum
Brandy
The technology of biogas production from cow dung was developed in India largely due to the efforts of ______.
Gas Authority of India
Oil and Natural Gas Commission
Indian Agricultural Research Institute and Khadi and Village Industries Commission
Indian Oil Corporation
The free-living fungus Trichoderma can be used for ______.
killing insects
biological control of plant diseases
controlling butterfly caterpillars
producing antibiotics
What would happen if oxygen availability to activated sludge flocs is reduced?
It will slow down the rate of degradation of organic matter.
The center of flocs will become anoxic, which would cause death of bacteria and eventually breakage of flocs.
Flocs would increase in size as anaerobic bacteria would grow around flocs.
Protozoa would grow in large numbers.
Mycorrhiza does not help the host plant in ______.
Enhancing its phosphorus uptake capacity
Increasing its tolerance to drought
Enhancing its resistance to root pathogens
Increasing its resistance to insects
Which one of the following is not a nitrogen-fixing organism?
Anabaena
Nostoc
Azotobacter
Pseudomonas
Rhizobitim
Big holes in Swiss cheese are made by ______.
a machine
a bacterium that produces methane gas
a bacterium producing a large amount of carbon dioxide
a fungus that releases a lot of gases during its metabolic activities
The residue left after methane production from cattle dung is ______.
burnt
buried in land fills
used as manure
used in civil construction
Methanogens do not produce ______.
oxygen
methane
hydrogen sulfide
carbon dioxide
Activated sludge should have the ability to settle quickly so that it can ______.
be rapidly pumped back from sedimentation tank to aeration tank
absorb pathogenic bacteria present in waste water while sinking to the bottom of the settling tank
be discarded and anaerobically digested
absorb colloidal organic matter
Match the items in Column ‘A’ and Column ‘B’ and choose correct answer.
| Column I | Column II |
| A. Lady bird | i. Methano bacterium |
| B. Mycorrhiza | ii. Trichoderma |
| C. Biological control | iii. Aphids |
| D. Biogas | iv. Glomus |
The correct answer is:
A - ii, B - iv, C - iii, D - i
A - iii, B - iv, C - ii, D - i
A - iv, B - i, C - ii, D - iii
A - iii, B - ii, C - i, D - iv
NCERT Exemplar solutions for Biology Exemplar [English] Class 12 10 Microbes in Human Welfare VERY SHORT ANSWER [Pages 72 - 73]
Why does ‘Swiss cheese’ have big holes?
What are fermentors?
Name a microbe used for statin production.
How do statins lower blood cholesterol levels?
Why do we prefer to call secondary waste water treatment as biological treatment?
What for Nucleopolyhydro viruses are being used now a days?
How has the discovery of antibiotics helped mankind in the field of medicine?
Why is distillation required for producing certain alcoholic drinks?
Write the most important characteristic that Aspergillus niger, Clostridium butylicum, and Lactobacillus share.
What would happen if our intestine harbours microbial flora exactly similar to that found in the rumen of cattle?
Give any two microbes that are useful in biotechnology.
What is the source organism for ECORI, restriction endonuclease?
Name any genetically modified crop.
Why are blue green algae not popular as biofertilisers?
Which species of Penicillium produces Roquefort cheese?
Name the states involved in Ganga action plan.
Name any two industrially important enzymes.
Name an immune immunosupressive agent?
Give an example of a rod shaped virus.
What is the group of bacteria found in both the rumen of cattle and shidge of sewage treatment?
Name a microbe used for the production of Swiss cheese.
NCERT Exemplar solutions for Biology Exemplar [English] Class 12 10 Microbes in Human Welfare SHORT ANSWER [Pages 73 - 74]
Why are flocs important in biological treatment of waste water?
How has the bacterium Bacillus thuringiensis helped us in controlling caterpillars of insect pests?
How do mycorrhizal fungi help the plants harbouring them?
Why are cyanobacteria considered useful in paddy fields?
How was penicillin discovered?
Name the scientists who were credited for showing the role of Penicillin as an antibiotic?
How do bioactive molecules of fungal origin help in restoring good health of humans?
What roles do enzymes play in detergents that we use for washing clothes? Are these enzymes produced from some unique microorganisms?
What is the chemical nature of biogas. Name an organism which is involved in biogas production?
How do microbes reduce the environmental degradation caused by chemicals?
What is a broad spectrum antibiotic? Name one such antibiotic.
What are viruses parasitising bacteria called? Draw a well labelled diagram of the same.
Which bacterium has been used as a clot buster? What is its mode of action?
What are biofertilizers?
Give two examples of biofertilizer.
NCERT Exemplar solutions for Biology Exemplar [English] Class 12 10 Microbes in Human Welfare LONG ANSWER [Page 74]
Why is aerobic degradation more important than anaerobic degradation for the treatment of large volumes of waste waters rich in organic matter. Discuss.
Discuss about the major programs that the Ministry of Environment and Forests, Government of India, has initiated for saving major Indian rivers from pollution.
Ganga has recently been declared the national river. Discuss the implication with respect to pollution of this river.
Draw a diagrammatic sketch of biogas plant, and label its various components given below: Gas Holder, Sludge Chamber, Digester, Dung+water chamber.
Describe the main ideas behind the biological control of pests and diseases.
What would happen if a large volume of untreated sewage is discharged into a river?
In what way anaerobic sludge digestion is important in sewage treatments?
Which type of food would have lactic acid bacteria? Discuss their useful application.
Solutions for 10: Microbes in Human Welfare
NCERT Exemplar solutions for Biology Exemplar [English] Class 12 chapter 10 - Microbes in Human Welfare
Shaalaa.com has the CBSE, Karnataka Board PUC Mathematics Biology Exemplar [English] Class 12 CBSE, Karnataka Board PUC solutions in a manner that help students grasp basic concepts better and faster. The detailed, step-by-step solutions will help you understand the concepts better and clarify any confusion. NCERT Exemplar solutions for Mathematics Biology Exemplar [English] Class 12 CBSE, Karnataka Board PUC 10 (Microbes in Human Welfare) include all questions with answers and detailed explanations. This will clear students' doubts about questions and improve their application skills while preparing for board exams.
Further, we at Shaalaa.com provide such solutions so students can prepare for written exams. NCERT Exemplar textbook solutions can be a core help for self-study and provide excellent self-help guidance for students.
Concepts covered in Biology Exemplar [English] Class 12 chapter 10 Microbes in Human Welfare are Microbes in Household Products, Microbes in Industrial Products, Microbes in Sewage Treatment, Microbes as Biocontrol Agents, Microbes in Production of Biogas, Microbes as Biofertilizers, Overview of Microbes in Human Welfare, Microorganisms (Microbes) and Microbiology, Applications of Biotechnology in Health and Medicine.
Using NCERT Exemplar Biology Exemplar [English] Class 12 solutions Microbes in Human Welfare exercise by students is an easy way to prepare for the exams, as they involve solutions arranged chapter-wise and also page-wise. The questions involved in NCERT Exemplar Solutions are essential questions that can be asked in the final exam. Maximum CBSE, Karnataka Board PUC Biology Exemplar [English] Class 12 students prefer NCERT Exemplar Textbook Solutions to score more in exams.
Get the free view of Chapter 10, Microbes in Human Welfare Biology Exemplar [English] Class 12 additional questions for Mathematics Biology Exemplar [English] Class 12 CBSE, Karnataka Board PUC, and you can use Shaalaa.com to keep it handy for your exam preparation.
