125876 + Interview Questions in General QA Page 307 InterviewSolution

15301.	Do you justify the headmaster’s behaviour? If not, state your reasons.
Answer» No, I don’t justify the headmaster’s behaviour. Corporal punishment is not the correct way to correct the wrong doing. And continuous corporal punishment is the worst part of it. That only provokes revolt not remorse.

Discussion

15302.	Write the Summary of ' Swami is Expelled from School'.
Answer» Rasipuram Krishnaswamy Narayan’s novel Swami and Friends is an interesting story of Swami. The present part deals with one incident in Swami’s school life. One day Swami and his friends did not attend classes. Moreover, they broke the window panes of the Headmaster’s room. The peon saw that act. The following day the headmaster entered Swami’s class with a cane and a furious face. He started scolding them. He also demanded every one to explain to him why they had been absent the previous day. When they cooked up some stories, he asked for proof. He used the cane, asked them to stand up on their benches, announced suspension, etc. When it was the turn of Swami, he had no stories to tell the headmaster. His silence added insult to the headmaster’s injury. He went on beating Swami on the shoulders, the back with his cane. Swami’s complaints of pain made the headmaster more violent. Not able to bear the torture any more, Swami left the class

Discussion

15303.	How Newspapers, Magazines and Pamphlets are helpful in writing history?
Answer» A number of newspapers, magazines and pamphlets, in different Indian languages, were printed in modern age in India. Out of them ‘The Tribune’, ‘The Times of India’ and many other newspapers are still printing. Ah these newspapers and magazines give us information of many important events of modern age. Even they print any particular news of that age in today’s newspaper. In this way they are helpful in writing history.

Discussion

15304.	Look at the picture and answer the questions that follow.1. Why do you think the teacher is punishing that student?2. Can you suggest a few steps to correct the students causing nuisance?
Answer» 1. I think the teacher is punishing the student because he might cause nuisance. He might not finish his homework. He might be indisciplined in the class. I usually don’t approve this kind of action of the teacher because corporal punishment should not be initiated against children. It is common with the school children behaving improperly at their tender age. They don’t know the importance of education and how to behave. Teachers need great patience to change them. 2. Various different kinds of steps are at hand to correct erring students. Some of them are: 1. explaining to them in the way they appreciate what is wrong with them and how they can be good. 2. making them imagine that they are at the receiving end. 3. making them realise the value of the fruits of being good. 4. providing them with examples of bad behaviour ruining careers and lives. 5. engaging them in productive activities of their choice. 6. repeatedly attempting to understand their feelings, sentiments, and view points. 7. giving them opportunities to express themselves, to lead, to organise, to suggest programmes and activities. 8. ignoring their misdeeds and allowing and encouraging them to correct themselves. 9. informing their parents about their positive qualities. 10. encouraging them to participate in social service activities.

15304.

Look at the picture and answer the questions that follow.1. Why do you think the teacher is punishing that student?2. Can you suggest a few steps to correct the students causing nuisance?

Answer»

1. I think the teacher is punishing the student because he might cause nuisance. He might not finish his homework. He might be indisciplined in the class. I usually don’t approve this kind of action of the teacher because corporal punishment should not be initiated against children. It is common with the school children behaving improperly at their tender age. They don’t know the importance of education and how to behave. Teachers need great patience to change them.

2. Various different kinds of steps are at hand to correct erring students. Some of them are:

1. explaining to them in the way they appreciate what is wrong with them and how they can be good.

2. making them imagine that they are at the receiving end.

3. making them realise the value of the fruits of being good.

4. providing them with examples of bad behaviour ruining careers and lives.

5. engaging them in productive activities of their choice.

6. repeatedly attempting to understand their feelings, sentiments, and view points.

7. giving them opportunities to express themselves, to lead, to organise, to suggest programmes and activities.

8. ignoring their misdeeds and allowing and encouraging them to correct themselves.

9. informing their parents about their positive qualities.

10. encouraging them to participate in social service activities.

Discussion

15305.	When a metal wire elongates by hanging a load pn the gravitational potential energy is decreased. (a) This energy completely appears as the increased kinetic energy of the block. (b) This energy completely appears as the increased elastic potential energy of the wire. (c) This energy completely appears as heat. (d) None of these.
Answer» (d) None of these. Explanation: When a mass is hanged by a wire the gravitational potential energy decreased is mgl (where l is the elongation) of the wire. But the elastic potential energy increased in the wire = ½mgl. Hence the reduced gravitational potential energy will never completely appear as increased kinetic energy or increased elastic potential energy or as heat. Hence option (d).

15305.

When a metal wire elongates by hanging a load pn the gravitational potential energy is decreased. (a) This energy completely appears as the increased kinetic energy of the block. (b) This energy completely appears as the increased elastic potential energy of the wire. (c) This energy completely appears as heat. (d) None of these.

Answer»

(d) None of these.

Explanation:

When a mass is hanged by a wire the gravitational potential energy decreased is mgl (where l is the elongation) of the wire. But the elastic potential energy increased in the wire = ½mgl. Hence the reduced gravitational potential energy will never completely appear as increased kinetic energy or increased elastic potential energy or as heat. Hence option (d).

Discussion

15306.	A wire elongates by 1.0mm when a load W is hanged from it. If this wire goes over a pulley and two weights W each are hung at the two ends, the elongation of the wire will be (a) 0.5m (b) 1.0mm (c) 2.0mm (d) 4.0mm.
Answer» The correct answer is (b) 1.0 mm Explanation: The elongation will be the same because in both cases it is pulled by the same force at its both ends. In the case of hanging wire, the lower end is pulled by the weight W downwards and the upper end is pulled by the support upwards by the same magnitude of the force.

15306.

A wire elongates by 1.0mm when a load W is hanged from it. If this wire goes over a pulley and two weights W each are hung at the two ends, the elongation of the wire will be (a) 0.5m (b) 1.0mm (c) 2.0mm (d) 4.0mm.

Answer»

The correct answer is (b) 1.0 mm

Explanation:

The elongation will be the same because in both cases it is pulled by the same force at its both ends. In the case of hanging wire, the lower end is pulled by the weight W downwards and the upper end is pulled by the support upwards by the same magnitude of the force.

Discussion

15307.	A wire elongates by 1.0 mm when a load W is hanged from it. If this wire goes over a pulley and two weights W each are hung at the two ends, the elongation of the wire will be(a) 0.5 m(b) 1.0 mm(c) 2.0 mm(d) 4.0 mm.
Answer» The correct answer is (b) 1.0 mm Explanation: The elongation will be the same because in both cases it is pulled by the same force at its both ends. In the case of hanging wire, the lower end is pulled by the weight W downwards and the upper end is pulled by the support upwards by the same magnitude of the force.

15307.

A wire elongates by 1.0 mm when a load W is hanged from it. If this wire goes over a pulley and two weights W each are hung at the two ends, the elongation of the wire will be(a) 0.5 m(b) 1.0 mm(c) 2.0 mm(d) 4.0 mm.

Answer»

The correct answer is (b) 1.0 mm

Explanation:

The elongation will be the same because in both cases it is pulled by the same force at its both ends. In the case of hanging wire, the lower end is pulled by the weight W downwards and the upper end is pulled by the support upwards by the same magnitude of the force.

Discussion

15308.	Acid present in apple’s A) Citric acid B) Lactic acid C) Malic acid D) Tannic acid
Answer» Correct option is C) Malic acid

Discussion

15309.	What are the two divisions of Bio-geography?
Answer» Phytogeography and Zoo-geography

Discussion

15310.	What is Hydrology?
Answer» Hydrology studies the realm of water over the surface of the earth including oceans, lakes, rivers and other water bodies and its effect on different life.

Discussion

15311.	What is economic geography?
Answer» Economic geography deals with the spatial aspects of production, distribution and consumption and also helps in understanding the most proper location for establishing different human activities.

Discussion

15312.	What is Astronomical geography?
Answer» It is the study of heavenly bodies of the space like planets, satellites, stars etc in relation to the earth.

Discussion

15313.	Write two definitions of Physical Geography?
Answer» Oxford Dictionary: The branch of geography which deals with the natural features of the earth surface Monk house F.J: Physical geography is concerned with those aspects of geography, which are concerned with the shape and form of the land surface, the configuration, the extent, and the nature of the seas and oceans.

15313.

Write two definitions of Physical Geography?

Answer»

Oxford Dictionary: The branch of geography which deals with the natural features of the earth surface

Monk house F.J: Physical geography is concerned with those aspects of geography, which are concerned with the shape and form of the land surface, the configuration, the extent, and the nature of the seas and oceans.

Discussion

15314.	Write two definitions of Geography?
Answer» Vidal de la blache: Geography is the science of places. Marthe: Geography is the science of distribution.

15314.

Write two definitions of Geography?

Answer»

Vidal de la blache: Geography is the science of places.

Marthe: Geography is the science of distribution.

Discussion

15315.	Mention the components of Physical Geography?
Answer» Lithosphere, Hydrosphere, Atmosphere and biosphere

Discussion

15316.	State the content of Geography?
Answer» Geography is a study of the varied features on the earth’s surface and their characteristics. Varied natural or physical factors of environment. Such as land forms, water bodies, minerals, climate, soils, natural vegetation and animal life, cultural or man made factors of environment like human settlement, their skills and capacities and the inter relationship between environment and man are included into the content of the geography.

Discussion

15317.	Why Geography is called ‘Earth Science’?
Answer» Geography is fundamentally a description of the earth. It deals with the varied natural or physical factors of environment, such as land forms, mountains water bodies, minerals, climate, soils, natural vegetation and plains

Discussion

15318.	Name the four branches of Human Geography.
Answer» Cultural Geography, Historical Geography, Economic Geography, Agricultural Geography.

Discussion

15319.	What is Cultural Environment?
Answer» The Cultural environment consists of all man made features on the surface of the earth. It is created by man for his own benefit. The settlements, dwellings, transport facilities, agriculture, industries, religion and government are some of the elements of cultural environment. It is also varies from place to place.

Discussion

15320.	What is Mathematical Geography?
Answer» The study of the shape and size of the earth, measurement of its curvature is known as Mathematical Geography. It helps to represent Latitudes, Longitudes, Shape of the Earth, Size, Cartographic and Quantitative Techniques, latitudes, longitude, shape of the Earth, Size, Cartographic and Quantitative Techniques.

Discussion

15321.	Explain the term of Geography?
Answer» The word Geography is derived from the two Greek word ‘Geo’ which means earth and Graphic which means writing or study. Thus literally Geography means writing or study about the earth. Geography not only deals with a description of the earth, but it also deals with its inhabitants. So, Geography is the study of the earth and its people.

Discussion

15322.	What is Seismology?
Answer» The systematic study of earth quakes and propagation of elastic waves through the Earth.

Discussion

15323.	What is the main focus of Physical Geography?
Answer» The main focus of the Physical geography is on the life layer, a zone of the lands and oceans containing most of the world of organic life or biosphere. It concern physical factors that make the life layer habitable for all forms of plants and animals, but more particularly for humans.

Discussion

15324.	What is Oceanography?
Answer» The branch of science that deals with the physical and biological properties and phenomena of the sea, ocean, relief of the ocean floor.

Discussion

15325.	How is Geography a discipline of synthesis?
Answer» It is considered to be a liaison subject. It recognizes the fact that the world is a system of interdependency. Geography as an integrating discipline stands midway between Natural Science and Social Science.

Discussion

15326.	What is Climatology?
Answer» Climatology encompasses the study of structure of atmosphere and elements of climates and climatic types and regions.

Discussion

15327.	Statement 1: Ephemerals are drought evaders. Statement 2: They are not true xerophytes. (a) Statement 1 is correct. Statement 2 is incorrect. (b) Statement 1 is incorrect. Statement 2 is correct. (c) Both the statements are correct. (d) Both the statements are incorrect.
Answer» (c) Both the statements are correct.

Discussion

15328.	The statements given below describe certain features that are observed in the pistil of flowers. i. Pistil may have many carpels ii. Each carpel may have more than one ovule iii. Each carpel has only one ovule iv. Pistil have only one carpel Choose the statements that are true from the options below: (a) i and ii (b) i and iii (c) ii and iv (d) iii and iv
Answer» The correct answer is (a) i and ii

Discussion

15329.	The statements given below describe certain features that are observed in the pistil of flowers.i. Pistil may have many carpelsii. Each carpel may have more than one ovuleiii. Each carpel has only one ovuleiv. Pistil have only one carpelChoose the statements that are true from the options below:(a) i and ii(b) i and iii(c) ii and iv(d) iii and iv
Answer» Correct option (a) i and ii Explanation: • Pistil may have many carpels (multicapillary pistil like Papaver) • Each carpel may have more than one ovule (like Watermelon,.Papaya etc.)

15329.

The statements given below describe certain features that are observed in the pistil of flowers.i. Pistil may have many carpelsii. Each carpel may have more than one ovuleiii. Each carpel has only one ovuleiv. Pistil have only one carpelChoose the statements that are true from the options below:(a) i and ii(b) i and iii(c) ii and iv(d) iii and iv

Answer»

Correct option (a) i and ii

Explanation:

• Pistil may have many carpels (multicapillary pistil like Papaver)

• Each carpel may have more than one ovule (like Watermelon,.Papaya etc.)

Discussion

15330.	Identify the incorrect statement.(a) In asexual reproduction, the offspring produced are morphologically and genetically identical to the parent.(b) Zoospores are sexual reproductive structures.(c) In asexual reproduction, a single parent produces offspring with or without the formation of gametes.(d) Conidia are asexual structures in Penicillium.
Answer» (b) Zoospores are sexual reproductive structures.

Discussion

15331.	There are various types of reproduction. The type of reproduction adopted by an organism depends on(a) The habitat and morphology of the organism(b) Morphology of the organism(c) Morphology and physiology of the organism(d) The organism’s habitat, physiology and genetic make up
Answer» Correct option (d) The organism’s habitat, physiology and genetic make up Explanation: The organism’s habitat, its internal physiology and several other factors (genetic make up) are collectively responsible for how it reproduces. When offspring is produced by a single parent with or without the involvement of gamete formation, the reproduction is asexual.

15331.

There are various types of reproduction. The type of reproduction adopted by an organism depends on(a) The habitat and morphology of the organism(b) Morphology of the organism(c) Morphology and physiology of the organism(d) The organism’s habitat, physiology and genetic make up

Answer»

Correct option (d) The organism’s habitat, physiology and genetic make up

Explanation:

The organism’s habitat, its internal physiology and several other factors (genetic make up) are collectively responsible for how it reproduces. When offspring is produced by a single parent with or without the involvement of gamete formation, the reproduction is asexual.

Discussion

15332.	There are various types of reproduction. The type of reproduction adopted by an organism depends on: a. The habitat and morphology of the organism b. Morphology of the organism c. Morphology and physiology of the organism d. The organism’s habitat, physiology and genetic makeup
Answer» d. The organism’s habitat, physiology and genetic makeup

Discussion

15333.	Fill in the blanks.1. Plants can prepare _______ 2. _______ are positively geotropic in nature. 3. Mango plant is a _______ plant. 4. _______ plants store food in their roots. 5. The aerial part of the plant body above the ground is known as _______6. The part of the stem between two successive nodes is called _______ 7. The flat portion of the leaf is called _______8. The green colour of the leaf is due to the presence of green coloured pigment called _______ 9. _______ plant’s leaves grow up to 3 metres across. 10. _______ are free floating Algae. 11. _______ desert is called as Great Indian desert. 12. River Ganges is _______ km long. 13. Marine plants perform about _______ of all photosynthesis that occurs on the planet.
Answer» 1. food 2. Roots 3. dicotyledonous 4. Carrot and beet root 5. shoot system 6. internode 7. Leaf Lamina 8. Chlorophyll 9. Victoria amazonica 10. Phytoplanktons 11. Thar 12. 2525 13. 40%

15333.

Fill in the blanks.1. Plants can prepare ___ 2. _ are positively geotropic in nature. 3. Mango plant is a _ plant. 4. _ plants store food in their roots. 5. The aerial part of the plant body above the ground is known as _6. The part of the stem between two successive nodes is called _ 7. The flat portion of the leaf is called _8. The green colour of the leaf is due to the presence of green coloured pigment called _ 9. _ plant’s leaves grow up to 3 metres across. 10. _ are free floating Algae. 11. _ desert is called as Great Indian desert. 12. River Ganges is _ km long. 13. Marine plants perform about _____ of all photosynthesis that occurs on the planet.

Answer»

1. food

2. Roots

3. dicotyledonous

4. Carrot and beet root

5. shoot system

6. internode

7. Leaf Lamina

8. Chlorophyll

9. Victoria amazonica

10. Phytoplanktons

11. Thar

12. 2525

13. 40%

Discussion

15334.	Give the scientific name of the source organism from which the first antibiotic was produced.
Answer» Penicillium notatum

Discussion

15335.	Match the following :1.Tap root(a)gas2.Aquatic plant(b)Teak tree3.Desert plant(c)Neem4.Grassland(d)Opuntia5.Terrestrial plant(e)Water lily
Answer» 1. – (c) 2. – (e) 3. – (d) 4. – (a) 5. – (b)

15335.

Match the following :1.Tap root(a)gas2.Aquatic plant(b)Teak tree3.Desert plant(c)Neem4.Grassland(d)Opuntia5.Terrestrial plant(e)Water lily

Answer»

1. – (c)

2. – (e)

3. – (d)

4. – (a)

5. – (b)

Discussion

15336.	Give any two examples for free-living nitrogen fixing bacteria.
Answer» Azospirillum and Azotobacter

Discussion

15337.	Name the free-living nitrogen-fixing bacteria in the soil.
Answer» Azospirillum and Azotobacter.

Discussion

15338.	Which one of the following is not a nitrogen-fixing organism?a. Anabaenab. Nostocc. Azotobacterd. Pseudomonas
Answer» d. Pseudomonas

Discussion

15339.	What are the uses of plants?
Answer» Plants are used as food, medicine, wood and shelter.

Discussion

15340.	Name two free-living nitrogen fixing microbes.
Answer» Azotobacter and Clostridium.

Discussion

15341.	The first land plants are ______ (a) neem and pine (b) hibiscus and lotus (c) banyan and peepal (d) mosses and liverworts
Answer» (d) mosses and liverworts

Discussion

15342.	What differences do you see in the growth of trees like mango, banyan and peepal and that of bamboo, coconut and toddy palms?
Answer» 1. Trees like mango, banyan and peepal have lot of branches and leaves. 2. They have a thick and wide trunk which is short. 3. Trees like bamboo, coconut and toddy palm have few leaves and they are found only at the top of the trunk. 4. The trunk of the tree is tall and comparatively thin.

15342.

What differences do you see in the growth of trees like mango, banyan and peepal and that of bamboo, coconut and toddy palms?

Answer»

1. Trees like mango, banyan and peepal have lot of branches and leaves.

2. They have a thick and wide trunk which is short.

3. Trees like bamboo, coconut and toddy palm have few leaves and they are found only at the top of the trunk.

4. The trunk of the tree is tall and comparatively thin.

Discussion

15343.	Mention a product of human welfare obtained with the help of each one of the following microbes:(i) LAB(ii) Saccharomyces cerevisiae(iii) Propionibacterium sharmanii(iv) Aspergillus niger
Answer» (i) Convert milk to curd (ii) Bread/alcoholic drinks (iii) Swiss cheese (iv) Citric acid

15343.

Mention a product of human welfare obtained with the help of each one of the following microbes:(i) LAB(ii) Saccharomyces cerevisiae(iii) Propionibacterium sharmanii(iv) Aspergillus niger

Answer»

(i) Convert milk to curd

(ii) Bread/alcoholic drinks

(iii) Swiss cheese

(iv) Citric acid

Discussion

15344.	How can students start the practice Microbes in Human Welfare Class 12 Mock Test?
Answer» The students who are the targeting class 12 exam should prepare for all the important chapters of the class 12 syllabus to secure the highest marks. The Microbes in Human Welfare Class 12 Mock Test designed by Sarthaks eConnect are one among the foremost reliable study material because it covers all the important chapters which are within the syllabus. These Class 12 Online Mock test Human Welfare are prepared by analyzing the previous years question papers & considering the weightage of every chapter within the syllabus. These important questions are prepared by our academic experts supported the syllabus guidelines prescribed by CBSE Microbes are ubiquitous. These are microscopic entities that aren't visible to the eye. While some are extremely useful, some will be fatal too. These tiny creatures catalyze some critical biological processes happening in nature with none human intervention. Try our Microbes in Human Welfare Class 12 Online Mock Test. we have divided this subject into many sections. Click here to start practice: - Class 12 microbes in human welfare mock test

15344.

How can students start the practice Microbes in Human Welfare Class 12 Mock Test?

Answer»

The students who are the targeting class 12 exam should prepare for all the important chapters of the class 12 syllabus to secure the highest marks. The Microbes in Human Welfare Class 12 Mock Test designed by Sarthaks eConnect are one among the foremost reliable study material because it covers all the important chapters which are within the syllabus.

These Class 12 Online Mock test Human Welfare are prepared by analyzing the previous years question papers & considering the weightage of every chapter within the syllabus. These important questions are prepared by our academic experts supported the syllabus guidelines prescribed by CBSE

Microbes are ubiquitous. These are microscopic entities that aren't visible to the eye. While some are extremely useful, some will be fatal too. These tiny creatures catalyze some critical biological processes happening in nature with none human intervention. Try our Microbes in Human Welfare Class 12 Online Mock Test. we have divided this subject into many sections.

Click here to start practice: - Class 12 microbes in human welfare mock test

Discussion

15345.	Class 12 Biology MCQ Questions of Microbes in Human Welfare with Answers?
Answer» Class 12 Biology MCQ Questions have been Prepared Based on Latest Exam Pattern and Syllabus. CBSE Class 12 Biology MCQ Questions of Microbes in Human Welfare with Answers available here for revision and score high marks in exams. Students can resolve MCQ Questions for Class 12 with Answers to realize their preparation level. Class 12 Biology MCQ Questions of Microbes in Human Welfare with Answers are designed in particular to assist recognize standards and their real-global implications. Let's start practice the given MCQ Questions for Class 12 Biology for your better preparation. Practice MCQ Question for Class 12 Biology chapter-wise 1. Bacillus thuringiensis (Bt) strains have been used for designing novel: (a) Bio-metallurigcal techniques (b) Bio-mineralization process (c) Bio-insecticidal plants (d) Bio-fertilizers 2. Nif gene occurs in: (a) Peiiicillium (b) Rhizobium (c) Aspergillus (d) Streptococcus 3. Azoila has a symbiotic relationship with: (a) Chlotfila (b) Anabaena (c) Nostoc (d) Tolypothrix 4. By cyanobacteria are useful biofertilizers in the field of: (a) Wheat (b) Maize (c) Rice (d) Sugarcane 5. Streptomycin is produced by: (a) By Streptomyces Scoleus (b) By Streptomyces fradiae (c) By Streptomyces venezueleae (d) By Streptomyces griseus 6. A free-living aerobic and non-photosynthetic nitrogen-fixing bacterium is: (a) Anabaena (b) Clostridium (c) Azotobactor (d) Rhizobium 7. In cheese, microorganisms are required for (a) ripening only (b) souring of milk only (c) souring and ripening (d) development of resistance to spoilage 8. Which bacterium helps in the production of ‘Swiss cheese’? (a) Propionibacterium sharmanii (b) Trichoderma polysporum (c) Saccharomyces cerevisiae (d) Aspergillus niger 9. The technology of biogas production from cow dung was developed in India largely due to the efforts of (a) Indian Agricultural Research Institute and Khadi & Village Industries Commission (b) Indian Oil Corporation (c) Oil and Natural Gas Commission (d) Gas Authority of India 10. Mycorrhiza does not help the host plant in (a) Increasing its resistance to insects (b) Enhancing its resistance to root pathogens (c) Increasing its tolerance to drought (d) Enhancing its phosphorus uptake capacity 11. Which one of the following is not a nitrogen-fixing organism? (a) Pseudomonas (b) Azotobacter (c) Nostoc (d) Anabaena 12. Which of the following microbes are used for the commercial production of citric acid? (a) Aspergillus (b) Asparagus (c) Asparagine (d) All of these 13. Which of the following is mainly produced by the activity of aerobic bacteria on sewage (a) March gas (b) Laughing gas (c) Mustard gas (d) Propane 14. Secondary sewage treatment is mainly a (a) Biological process (b) Chemical process (c) Mechanical process (d) Physical process 15. BOD of wastewater is estimated by measuring the amount of (a) oxygen consumption (b) oxygen evolution (c) biodegradable organic matter (d) total organic matter 16. Which one of the following alcoholic drinks is produced without distillation? (a) Wine (b) Whisky (c) Rum (d) Brandy 17. Which of these processes does not give off CO₂? (a) Lactate fermentation (b) Aerobic respiration (c) Alcoholic fermentation (d) None of these 18. Physical removal of large and small particles from the sewage through filtration and sedimentation is called? (a) Primary treatment (b) Tertiary treatment (c) Secondary treatment (d) Quaternary treatment 19. Which one of the following is not used in organic farming? (a) Oscillatoria (b) Earthworm (c) Snail (d) Glomus 20. Which of the following infectious disease cannot be controlled by antibiotics? (a) Whooping cough (b) Diphtheria (c) Pneumonia (d) Common cold 21. The aquatic fern, which is an excellent biofertiliser is (a) Azolla (b) Salvinia (c) Marsilia (d) Pteridium 22. Some hyperthermophilic organisms that grow in highly acidic (pH-2) habitats belong to the two groups (a) Cyanobacteria and diatoms (b) Protists and mosses (c) Liverworts and yeasts (d) Eubacteria and archaea 23. Which of the following is also called sac fungi that live parasitically and in various habitats? (a) Basidiomycetes (b) Ascomycetes (c) Phycomycetes (d) Zygomycetes 24. Cyclosporin A, used as an immuno suppression agent, is produced from (a) Monascus purpureus (b) Saccharomyces cerevisiae (c) Penicillium notatum (d) Trichoderma polysporum 25. Which of the following is a commercial blood cholesterol-lowering agent? (a) Lipase (b) Cyclosporin A (c) Statin (d) Streptokinase Answer : 1. Answer : (c) Bio-insecticidal plants Explanation: Bacillus thuringiensis strains have been used for designing bio insecticidal plants. A gene from this bacteria has an insecticidal property which is transferred to cotton plants to produce Bt cotton which is resistant to bollworm insects which is a major pest of cotton. 2. Answer : (b) Rhizobium Explanation: The nif genes are genes involved in nitrogen fixation. They are found in nitrogen-fixing bacteria. They occur as an operon in free-living anaerobic nitrogen-fixing bacteria such as Klebsiella pneumoniae, Rhodospirillum rubrum, and Rhodobacter capsulatus. 3. Answer : : (b) Anabaena Explanation: Azolla maintains a symbiotic relationship with Anabaena. They work together and benefit each other. Azolla fern procures a safe environment for Cyanobacteria and in return, it gets nitrogen fixed by Anabaena. 4. Answer : (c) Rice Explanation: Cyanobacteria are used as biofertilizers mostly in paddy fields or rice fields. They help in nitrogen fixation and thus help in increasing the yield of rice. 5. Answer : (d) By Streptomyces griseus Explanation: Streptomycin is an antibiotic agent produced by certain strains of Streptomyces griscus. It was found as the result of a search for an agent that would be active against gram-negative bacteria yet "nontoxic to the body and would therefore offer possibilities as a chemotherapeutic agent. 6. Answer : (c) Azotobactor Explanation: the free living aerobic non-photosynthetic nitrogen fixing bacterium is Azotobacter. 7. Answer : (c) souring and ripening Explanation: Microorganisms are required for the souring of milk for the production of cheese. Basically, Lactic Acid bacteria (LABs) are added to the milk for the formation of cheese. Ripening is a step later on for the maturation of cheese using microorganisms and other factors such as temperature, humidity, etc. 8. Answer : (a) Propionibacterium sharmanii Explanation: The bacterium Propionibacterium sharmanii is involved in the production of Swiss cheese. 9. Answer : (a) Indian Agricultural Research Institute and Khadi & Village Industries Commission Explanation: The technology of biogas production from cow dung was developed in India largely due to the efforts of the Indian Agricultural Research Institute (IARI) and Khadi & Village Industries Commission (KVIC). 10. Answer : (a) Increasing its resistance to insects Explanation: mycorrhizae permit the plant to obtain additional moisture and nutrients and Increasing its resistance to insects. This is particularly important in the uptake of phosphorus, one of the major nutrients required by plants. When mycorrhizae are present, plants are less susceptible to water stress. 11. Answer : (a) Pseudomonas Explanation: Pseudomonas is not a nitrogen-fixing bacteria. Pseudomonas is a saprophytic bacteria. Pseudomonas is used for biodegradation of organic pollutant like petroleum spillage. 12. Answer : (a) Aspergillus Explanation: Citric acid is obtained through the fermentation carried out by Aspergillus niger on sugary syrups. 13. Answer : (a) March gas Explanation: Marsh gas or methane gas is mainly produced by the activities of anaerobic bacteria on sewage. 14. Answer : (a) Biological process Explanation: Secondary sewage treatment is mainly a biological process. In secondary treatment, primary effluent is passed into large aeration tanks, where it is constantly agitated mechanically and air is pumped into it. This allows vigorous growth of useful aerobic microbes into floes. 15. Answer : (a) oxygen consumption Explanation: Biological oxygen demand (i.e., BOD) is measured by the amount of oxygen that would be consumed when all the organic matter in one liter is oxidized by bacteria. Thus, the BOD of waste water is estimated by measuring the amount of oxygen consumption. 16. Answer : (a) Wine Explanation: Wine is an alcoholic drink produced without distillation whereas whisky, rum and brandy are produced by the distillation of the fermented broth. 17. Answer : (a) Lactate fermentation Explanation: CO₂ is released during aerobic respiration in both plants and animals. During lactate fermentation, pyruvic acid, the product of glycolysis is reduced to lactic acid by the enzyme lactate dehydrogenase, there is no decarboxylation taking place so CO₂ is not released. 18. Answer : (a) Primary treatment Explanation: Physical removal of large and small particles through filtration and sedimentation is called primary sewage treatment. 19. Answer : (c) Snail Explanation: Organic farming is green manures, farmyard manure, vermicompost, crop rotation, biopesticides and biofertilizers. Snail cannot be a component of organic farming. 20.Answer : (d) Common cold Explanation: Antibiotics only work against infections caused by bacteria. They do not work against infections caused by viruses. Viruses cause colds, the flu, and most coughs and sore throats. 21. Answer : (a) Azolla Explanation: Azolla is a pteridophyte or aquatic plant,float on the surface of the water and is used as a biofertilizer because it has an association with nitrogen–fixing cyanobacteria anabaena azollae. 22.Answer : (d) Eubacteria and archaea Explanation: There are two major groups of monerans archaebacteria (ancient bacteria) and eubacteria (true bacteria). Eubacteria is of further two types - bacteria and cyanobacteria. Thermoacidophiles are a type of archaebacteria which live in extremely acidic environment (pH 2) that have extremely high temperatures (upto 110°C). 23. Answer : (b) Ascomycetes Explanation: Ascomycetes is called sac fungi that live parasitically and in various habitats. 24. Answer : (d) Trichoderma polysporum Explanation: Cyclosporine A is produced by fungi Trichoderma polysporum. Trichoderma polysporum produces Cyclosporine with the help of fermentation process. 25. Answer : (c) Statin Explanation: Statin is known to be helpful in the prevention of Cardiac diseases such a heart attack and heart stroke. They have been proved helpful in lowering the blood cholesterol level. Statin lowers the LDL which is known as bad cholesterol by reducing its production in the liver. Click here to practice MCQ Question for Microbes in Human Welfare Class 12

15345.

Class 12 Biology MCQ Questions of Microbes in Human Welfare with Answers?

Answer»

Class 12 Biology MCQ Questions have been Prepared Based on Latest Exam Pattern and Syllabus. CBSE Class 12 Biology MCQ Questions of Microbes in Human Welfare with Answers available here for revision and score high marks in exams.

Students can resolve MCQ Questions for Class 12 with Answers to realize their preparation level. Class 12 Biology MCQ Questions of Microbes in Human Welfare with Answers are designed in particular to assist recognize standards and their real-global implications. Let's start practice the given MCQ Questions for Class 12 Biology for your better preparation.

Practice MCQ Question for Class 12 Biology chapter-wise

1. Bacillus thuringiensis (Bt) strains have been used for designing novel:

(a) Bio-metallurigcal techniques
(b) Bio-mineralization process
(c) Bio-insecticidal plants
(d) Bio-fertilizers

2. Nif gene occurs in:

(a) Peiiicillium
(b) Rhizobium
(c) Aspergillus
(d) Streptococcus

3. Azoila has a symbiotic relationship with:

(a) Chlotfila
(b) Anabaena
(c) Nostoc
(d) Tolypothrix

4. By cyanobacteria are useful biofertilizers in the field of:

(a) Wheat
(b) Maize
(c) Rice
(d) Sugarcane

5. Streptomycin is produced by:

(a) By Streptomyces Scoleus
(b) By Streptomyces fradiae
(c) By Streptomyces venezueleae
(d) By Streptomyces griseus

6. A free-living aerobic and non-photosynthetic nitrogen-fixing bacterium is:

(a) Anabaena
(b) Clostridium
(c) Azotobactor
(d) Rhizobium

7. In cheese, microorganisms are required for

(a) ripening only
(b) souring of milk only
(c) souring and ripening
(d) development of resistance to spoilage

8. Which bacterium helps in the production of ‘Swiss cheese’?

(a) Propionibacterium sharmanii
(b) Trichoderma polysporum
(c) Saccharomyces cerevisiae
(d) Aspergillus niger

9. The technology of biogas production from cow dung was developed in India largely due to the efforts of

(a) Indian Agricultural Research Institute and Khadi & Village Industries Commission
(b) Indian Oil Corporation
(c) Oil and Natural Gas Commission
(d) Gas Authority of India

10. Mycorrhiza does not help the host plant in

(a) Increasing its resistance to insects
(b) Enhancing its resistance to root pathogens
(c) Increasing its tolerance to drought
(d) Enhancing its phosphorus uptake capacity

11. Which one of the following is not a nitrogen-fixing organism?

(a) Pseudomonas
(b) Azotobacter
(c) Nostoc
(d) Anabaena

12. Which of the following microbes are used for the commercial production of citric acid?

(a) Aspergillus
(b) Asparagus
(c) Asparagine
(d) All of these

13. Which of the following is mainly produced by the activity of aerobic bacteria on sewage

(a) March gas
(b) Laughing gas
(c) Mustard gas
(d) Propane

14. Secondary sewage treatment is mainly a

(a) Biological process
(b) Chemical process
(c) Mechanical process
(d) Physical process

15. BOD of wastewater is estimated by measuring the amount of

(a) oxygen consumption
(b) oxygen evolution
(c) biodegradable organic matter
(d) total organic matter

16. Which one of the following alcoholic drinks is produced without distillation?

(a) Wine
(b) Whisky
(c) Rum
(d) Brandy

17. Which of these processes does not give off CO₂?

(a) Lactate fermentation
(b) Aerobic respiration
(c) Alcoholic fermentation
(d) None of these

18. Physical removal of large and small particles from the sewage through filtration and sedimentation is called?

(a) Primary treatment
(b) Tertiary treatment
(c) Secondary treatment
(d) Quaternary treatment

19. Which one of the following is not used in organic farming?

(a) Oscillatoria
(b) Earthworm
(c) Snail
(d) Glomus

20. Which of the following infectious disease cannot be controlled by antibiotics?

(a) Whooping cough
(b) Diphtheria
(c) Pneumonia
(d) Common cold

21. The aquatic fern, which is an excellent biofertiliser is

(a) Azolla
(b) Salvinia
(c) Marsilia
(d) Pteridium

22. Some hyperthermophilic organisms that grow in highly acidic (pH-2) habitats belong to the two groups

(a) Cyanobacteria and diatoms
(b) Protists and mosses
(c) Liverworts and yeasts
(d) Eubacteria and archaea

23. Which of the following is also called sac fungi that live parasitically and in various habitats?

(a) Basidiomycetes
(b) Ascomycetes
(c) Phycomycetes
(d) Zygomycetes

24. Cyclosporin A, used as an immuno suppression agent, is produced from

(a) Monascus purpureus
(b) Saccharomyces cerevisiae
(c) Penicillium notatum
(d) Trichoderma polysporum

25. Which of the following is a commercial blood cholesterol-lowering agent?

(a) Lipase
(b) Cyclosporin A
(c) Statin
(d) Streptokinase

Answer :

1. Answer : (c) Bio-insecticidal plants

Explanation: Bacillus thuringiensis strains have been used for designing bio insecticidal plants. A gene from this bacteria has an insecticidal property which is transferred to cotton plants to produce Bt cotton which is resistant to bollworm insects which is a major pest of cotton.

2. Answer : (b) Rhizobium

Explanation: The nif genes are genes involved in nitrogen fixation. They are found in nitrogen-fixing bacteria. They occur as an operon in free-living anaerobic nitrogen-fixing bacteria such as Klebsiella pneumoniae, Rhodospirillum rubrum, and Rhodobacter capsulatus.

3. Answer : : (b) Anabaena

Explanation: Azolla maintains a symbiotic relationship with Anabaena. They work together and benefit each other. Azolla fern procures a safe environment for Cyanobacteria and in return, it gets nitrogen fixed by Anabaena.

4. Answer : (c) Rice

Explanation: Cyanobacteria are used as biofertilizers mostly in paddy fields or rice fields. They help in nitrogen fixation and thus help in increasing the yield of rice.

5. Answer : (d) By Streptomyces griseus

Explanation: Streptomycin is an antibiotic agent produced by certain strains of Streptomyces griscus. It was found as the result of a search for an agent that would be active against gram-negative bacteria yet "nontoxic to the body and would therefore offer possibilities as a chemotherapeutic agent.

6. Answer : (c) Azotobactor

Explanation: the free living aerobic non-photosynthetic nitrogen fixing bacterium is Azotobacter.

7. Answer : (c) souring and ripening

Explanation: Microorganisms are required for the souring of milk for the production of cheese. Basically, Lactic Acid bacteria (LABs) are added to the milk for the formation of cheese. Ripening is a step later on for the maturation of cheese using microorganisms and other factors such as temperature, humidity, etc.

8. Answer : (a) Propionibacterium sharmanii

Explanation: The bacterium Propionibacterium sharmanii is involved in the production of Swiss cheese.

9. Answer : (a) Indian Agricultural Research Institute and Khadi & Village Industries Commission

Explanation: The technology of biogas production from cow dung was developed in India largely due to the efforts of the Indian Agricultural Research Institute (IARI) and Khadi & Village Industries Commission (KVIC).

10. Answer : (a) Increasing its resistance to insects

Explanation: mycorrhizae permit the plant to obtain additional moisture and nutrients and Increasing its resistance to insects. This is particularly important in the uptake of phosphorus, one of the major nutrients required by plants. When mycorrhizae are present, plants are less susceptible to water stress.

11. Answer : (a) Pseudomonas

Explanation: Pseudomonas is not a nitrogen-fixing bacteria. Pseudomonas is a saprophytic bacteria. Pseudomonas is used for biodegradation of organic pollutant like petroleum spillage.

12. Answer : (a) Aspergillus

Explanation: Citric acid is obtained through the fermentation carried out by Aspergillus niger on sugary syrups.

13. Answer : (a) March gas

Explanation: Marsh gas or methane gas is mainly produced by the activities of anaerobic bacteria on sewage.

14. Answer : (a) Biological process

Explanation: Secondary sewage treatment is mainly a biological process. In secondary treatment, primary effluent is passed into large aeration tanks, where it is constantly agitated mechanically and air is pumped into it. This allows vigorous growth of useful aerobic microbes into floes.

15. Answer : (a) oxygen consumption

Explanation: Biological oxygen demand (i.e., BOD) is measured by the amount of oxygen that would be consumed when all the organic matter in one liter is oxidized by bacteria. Thus, the BOD of waste water is estimated by measuring the amount of oxygen consumption.

16. Answer : (a) Wine

Explanation: Wine is an alcoholic drink produced without distillation whereas whisky, rum and brandy are produced by the distillation of the fermented broth.

17. Answer : (a) Lactate fermentation

Explanation: CO₂ is released during aerobic respiration in both plants and animals. During lactate fermentation, pyruvic acid, the product of glycolysis is reduced to lactic acid by the enzyme lactate dehydrogenase, there is no decarboxylation taking place so CO₂ is not released.

18. Answer : (a) Primary treatment

Explanation: Physical removal of large and small particles through filtration and sedimentation is called primary sewage treatment.

19. Answer : (c) Snail

Explanation: Organic farming is green manures, farmyard manure, vermicompost, crop rotation, biopesticides and biofertilizers. Snail cannot be a component of organic farming.

20.Answer : (d) Common cold

Explanation: Antibiotics only work against infections caused by bacteria. They do not work against infections caused by viruses. Viruses cause colds, the flu, and most coughs and sore throats.

21. Answer : (a) Azolla

Explanation: Azolla is a pteridophyte or aquatic plant,float on the surface of the water and is used as a biofertilizer because it has an association with nitrogen–fixing cyanobacteria anabaena azollae.

22.Answer : (d) Eubacteria and archaea

Explanation: There are two major groups of monerans archaebacteria (ancient bacteria) and eubacteria (true bacteria). Eubacteria is of further two types - bacteria and cyanobacteria. Thermoacidophiles are a type of archaebacteria which live in extremely acidic environment (pH 2) that have extremely high temperatures (upto 110°C).

23. Answer : (b) Ascomycetes

Explanation: Ascomycetes is called sac fungi that live parasitically and in various habitats.

24. Answer : (d) Trichoderma polysporum

Explanation: Cyclosporine A is produced by fungi Trichoderma polysporum. Trichoderma polysporum produces Cyclosporine with the help of fermentation process.

25. Answer : (c) Statin

Explanation: Statin is known to be helpful in the prevention of Cardiac diseases such a heart attack and heart stroke. They have been proved helpful in lowering the blood cholesterol level. Statin lowers the LDL which is known as bad cholesterol by reducing its production in the liver.

Click here to practice MCQ Question for Microbes in Human Welfare Class 12

Discussion

15346.	Colonel Upton concluded the treaty of ………. in 1776.(a) Mangalore(b) Mysore(c) Purandhar(d) Pondicherry
Answer» (c) Purandhar

Discussion

15347.	Mention a product of human welfare obtained with the help of each one of the following microbes :(a) LAB (b) Saccharomyces cerevisiae (c) Propionibacterium shermanii(d) Aspergillus niger
Answer» (a) Milk to curd (b) Bread/ethanol/ alcoholic drinks / whiskey / brandy/ beer/ rum (c) Swiss cheese (d) Citric acid

15347.

Mention a product of human welfare obtained with the help of each one of the following microbes :(a) LAB (b) Saccharomyces cerevisiae (c) Propionibacterium shermanii(d) Aspergillus niger

Answer»

(a) Milk to curd

(b) Bread/ethanol/ alcoholic drinks / whiskey / brandy/ beer/ rum

(c) Swiss cheese

(d) Citric acid

Discussion

15348.	Casparian strip of endodermis has material …………….. (a) pectin (b) suberin (c) cutin (d) porin
Answer» Correct answer is (b) suberin

Discussion

15349.	Ascomycetes are called sac fungi. Give reason.
Answer» In ascomycetes the ascospores are found inside a bag like structure called ascus. Due to the presence of ascus, this group is popularly called "Sac fung

Discussion

15350.

How are ascomycetes different from Basidiomycetes?

Answer»

Ascomycetes	Basidiomycetes
(a) The fruiting body called ascocarp	(a) The fruiting body is called basidiocarp
(b) each as we contain 8 ascospores within	(b) Each basidium produces for basic diaspores exiguously
(c) They may or may not show dikaryotic phase in the life cycle	(c) The show or extended period of dikaryotic phase in the life cycle
(d) Asexual spores are found	(d) Asexual spores are not found.

Discussion

Explore topic-wise InterviewSolutions in .

Do you justify the headmaster’s behaviour? If not, state your reasons.

Write the Summary of ' Swami is Expelled from School'.

How Newspapers, Magazines and Pamphlets are helpful in writing history?

Look at the picture and answer the questions that follow.1. Why do you think the teacher is punishing that student?2. Can you suggest a few steps to correct the students causing nuisance?

A wire elongates by 1.0mm when a load W is hanged from it. If this wire goes over a pulley and two weights W each are hung at the two ends, the elongation of the wire will be (a) 0.5m (b) 1.0mm (c) 2.0mm (d) 4.0mm.

A wire elongates by 1.0 mm when a load W is hanged from it. If this wire goes over a pulley and two weights W each are hung at the two ends, the elongation of the wire will be(a) 0.5 m(b) 1.0 mm(c) 2.0 mm(d) 4.0 mm.

Acid present in apple’s A) Citric acid B) Lactic acid C) Malic acid D) Tannic acid

What are the two divisions of Bio-geography?

What is Hydrology?

What is economic geography?

What is Astronomical geography?

Write two definitions of Physical Geography?

Write two definitions of Geography?

Mention the components of Physical Geography?

State the content of Geography?

Why Geography is called ‘Earth Science’?

Name the four branches of Human Geography.

What is Cultural Environment?

What is Mathematical Geography?

Explain the term of Geography?

What is Seismology?

What is the main focus of Physical Geography?

What is Oceanography?

How is Geography a discipline of synthesis?

What is Climatology?

Statement 1: Ephemerals are drought evaders. Statement 2: They are not true xerophytes. (a) Statement 1 is correct. Statement 2 is incorrect. (b) Statement 1 is incorrect. Statement 2 is correct. (c) Both the statements are correct. (d) Both the statements are incorrect.

There are various types of reproduction. The type of reproduction adopted by an organism depends on(a) The habitat and morphology of the organism(b) Morphology of the organism(c) Morphology and physiology of the organism(d) The organism’s habitat, physiology and genetic make up

There are various types of reproduction. The type of reproduction adopted by an organism depends on: a. The habitat and morphology of the organism b. Morphology of the organism c. Morphology and physiology of the organism d. The organism’s habitat, physiology and genetic makeup

Give the scientific name of the source organism from which the first antibiotic was produced.

Match the following :1.Tap root(a)gas2.Aquatic plant(b)Teak tree3.Desert plant(c)Neem4.Grassland(d)Opuntia5.Terrestrial plant(e)Water lily

Give any two examples for free-living nitrogen fixing bacteria.

Name the free-living nitrogen-fixing bacteria in the soil.

Which one of the following is not a nitrogen-fixing organism?a. Anabaenab. Nostocc. Azotobacterd. Pseudomonas

What are the uses of plants?

Name two free-living nitrogen fixing microbes.

The first land plants are ______ (a) neem and pine (b) hibiscus and lotus (c) banyan and peepal (d) mosses and liverworts

What differences do you see in the growth of trees like mango, banyan and peepal and that of bamboo, coconut and toddy palms?

Mention a product of human welfare obtained with the help of each one of the following microbes:(i) LAB(ii) Saccharomyces cerevisiae(iii) Propionibacterium sharmanii(iv) Aspergillus niger

How can students start the practice Microbes in Human Welfare Class 12 Mock Test?

Class 12 Biology MCQ Questions of Microbes in Human Welfare with Answers?

Colonel Upton concluded the treaty of ………. in 1776.(a) Mangalore(b) Mysore(c) Purandhar(d) Pondicherry

Mention a product of human welfare obtained with the help of each one of the following microbes :(a) LAB (b) Saccharomyces cerevisiae (c) Propionibacterium shermanii(d) Aspergillus niger

Casparian strip of endodermis has material …………….. (a) pectin (b) suberin (c) cutin (d) porin

Ascomycetes are called sac fungi. Give reason.

How are ascomycetes different from Basidiomycetes?