CBSE Class 12 Biology Microbes in Human Welfare VBQs

Question. Which of the following serves as biofertiliser in paddy fields?
(a) Anabaena
(b) Azospirillum
(c) Nostoc
(d) Both (a) and (c)
Answer : D

Question. The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals, include the 
(a) thermoacidophiles
(b) methanogens
(c) eubacteria
(d) halophiles
Answer : B

Question. The diagram given below represents a typical biogas plant. Select the correct option for A, B and C, respectively. (Image 52)
(a) A–Sludge, B–Dung + Water, C– Gas holder
(b) A–Dung + Water, B–Sludge, C–CH CO 4 2 +
(c) A–Sludge, B–Gas holder, C–Dung + Water
(d) A–CH CO 4 2 + , B–Dung + Water, C–Sludge
Answer : C

Question. Bacillus thuringiensis is used as
(a) biofungicide
(b) biopesticide
(c) biocontrol agent
(d) bioweapon
Answer : C

Question. In Bt cotton, the Bt toxin present in plant tissue as protoxin is converted into active toxin due to
(a) alkaline pH of the insect gut 
(b) acidic pH of the insect gut
(c) action of gut microorganisms
(d) the presence of conversion factors in insect gut
Answer : A

Question. A biocontrol agent used for pest butterfly caterpillars is
(a) Trichoderma
(b) Bacillus thuringiensis
(c) Pseudomonas
(d) Rhizobium
Answer : B

Question. Select the group of organisms that are used as biofertilisers in organic farming.
(a) Clostridium, Beijerinckia, Glomus and Anabaena
(b) Trichoderma, Baculovirus and B. thuringiensis
(c) Nostoc, Azolla pinnata and Tobacco mosaic virus
(d) Penicillium, Streptococcus and Aspergillus
Answer : A

Question. Which of the following can be used as a biocontrol agent in the treatment of plant disease? 
(a) Chlorella
(b) Anabaena
(c) Lactobacillus
(d) Trichoderma
Answer : D

Question. Baculoviruses (Nucleopolyhedrovirus) do not show
(a) host specificity
(b) narrow spectrum applications
(c) effects on non-target insects
(d) utility in IPM programme
Answer : C

Question. Select the correct group of biocontrol agents.
(a) Trichoderma, Baculovirus, Bacillus thuringiensis
(b) Oscillatoria, Rhizobium, Trichoderma
(c) Nostoc, Azospirillum, Nucleopolyhedrovirus
(d) Bacillus thuringiensis, Tobacco mosaic virus, Aphids
Answer : A

Question. The most important of the symbiotic nitrogen-fixing bacteria, which forms nodules on the roots of legume plants is
(a) Aspergillus
(b) Rhizobium
(c) Penicillium
(d) Streptococcus
Answer : B

Question. Cultivation of Bt cotton has been much in the news.
The prefix Bt means
(a) ‘Barium-treated’ cotton seeds
(b) ‘Bigger thread’ variety of cotton with better tensile strength
(c) produced by ‘biotechnology’ using restriction enzymes and ligases
(d) carrying an endotoxin gene from Bacillus thuringiensis
Answer : D

Question. Trichoderma species, free-living fungi, are present in root ecosystems are potentially useful as
(a) biopesticides
(b) biofertilisers
(c) methanogens
(d) vectors for genetic engineering
Answer : A

Question. Among the following pairs of microbes, which pair has both the microbes that can be used asbiofe rtilisers? 
(a) Aspergillus and Rhizopus
(b) Rhizobium and Rhizopus
(c) Cyanobacteria and Rhizobium
(d) Aspergillus and Cyanobacteria
Answer : C

Question. Which of the following belongs to free-living nitrogen-fixing bacteria?
I. Rhizobium II. Azospirillum
III. Azotobacter
Choose the correct option.
(a) I and II
(b) I and III
(c) II and III
(d) All of these
Answer : C

Question. The symbiotic association of fungi with the roots of higher plants is called
(a) eubacteria
(b) actinomycetes
(c) mycorrhiza
(d) lichen
Answer : C

Question. Azolla is used as a biofertiliser because it 
(a) has association of mycorrhiza
(b) multiplies at faster rate to produce massive biomass
(c) has association of nitrogen-fixing Rhizobium
(d) has association of nitrogen-fixing cyanobacteria
Answer : D

I. Assertion and Reason In each of the following
questions, a statement of Assertion (A) is given by corresponding statement of Reason (R). Of the statements, mark the correct answer as
(a) If both A and R are true and R is the correct explanation of A
(b) If both A and R are true, but R is not correct explanation of A
(c) If A is true, but R is false
(d) If A is false, but R is true

Question. Assertion (A) Besides curdling of milk, LAB also improve curd’s nutritional quality.
Reason (R) LAB, when presents in human stomach, check disease causing microbes.
Answer : B

Question. Assertion (A) Biogas is used as fuel for cooking and lighting.
Reason (R) It is considered as an ecofriendly and a pollution free source of energy.
Answer : B

Question. Assertion (A) Disadvantages of synthetic pesticides can be overcome by the use of biopesticides.
Reason (R) Biopesticides control weeds and pest without causing any damage to living organisms.
Answer : A

Question. Assertion (A) Chemical pesticides are preferred over biopesticides.
Reason (R) Chemical pesticides are mostly expensive, hazardous and pollute the atmosphere.
Answer : D

Question. Assertion (A) Leguminous plants are best preferred in rotation of crops.
Reason (R) They have root nodules, which have nitrogen-fixing bacteria Clostridium.
Answer : C

Question. Assertion (A) Use of fertilisers greatly enhances crop productivity.
Reason (R) Irrigation is very important in increasing crop productivity.
Answer : B

Question. Assertion (A) Beer and wine are called soft liquours.
Reason (R) These beverages have lower percentage of alcohol.
Answer : A

Question. Assertion (A) An organ transplant patient is administered regular dose of cyclosporin-A.
Reason (R) Cyclosporin-A is an immunosuppresant agent.
Answer : A

Question. Assertion (A) Baculoviruses are broad spectrum insecticides.
Reason (R) These viruses are excellent choices for biocontrol in an ecologically sensitive area for integrated pest management.
Answer : D

II. Statement Based Questions

Question. Which of the following statements is correct?
(a) Ethanol is produced by the fermentation of malted cereals and fruit juices
(b) Wine is produced without distillation
(c) Saccharomyces is used for bread making
(d) All of the above
Answer : D

Question. Which of the following statements regarding baculoviruses as biocontrol agents are correct?
(a) Baculoviruses are pathogens that attack insects and other arthropods
(b) Most of these biocontrol agents belong to the genus Nucleopolyhedrovirus
(c) They do not harm plants mammals, birds, fish and other non-target insects
(d) All of the above
Answer : D

Question. Consider the following statements about organic farming. Which of the statement given below is correct?
(a) Organic farming promotes the use of crop rotations, cover crops and encourages balanced host/predator relationships
(b) Integrated pest, weed management and soil conservation systems are valuable tools of an organic farm
(c) Organic farming protects the environment, minimise soil degradation and erosion and decrease pollution
(d) All of the above
Answer : D

Question. Which of the following statement (s) is/are correct with regard to biocontrol agents?
(a) Ladybird beetles and dragonflies are used to get rid of aphids and mosquitoes, respectively
(b) Bacillus thuringiensis bacteria are used to control butterfly and caterpillars
(c) Trichoderma species are used to control several plant pathogens
(d) All of the above
Answer : D

Question. Which of the following statements about methanogens is incorrect?
(a) They can be used to produce biogas
(b) They are found in the rumen of cattle and their excreta
(c) They grow aerobically and breakdown cellulose rich food
(d) They produce methane gas
Answer : C

Question. Which of the following statement is/are correct?
(a) Biochemical Oxygen Demand (BOD) represents the amount of dissolved oxygen that would be consumed if all the organic matter in 1 L of water were oxidised by microorganism
(b) Sewage water is treated to reduce its BOD
(c) High value of BOD means the water is less polluted by organic matter
(d) Both (a) and (b)
Answer : D

Question. Benefits of mycorrhizae are indicated by which statement?
(a) It shows resistance to root borne pathogen
(b) It shows tolerance to salinity and pathogen
(c) It helps in the overall increase in the plant growth and development
(d) All of the above
Answer : D

Question. Consider the following statements. Which of the statement given below is incorrect?
(a) Microbes are also used to ferment fish, soybean and bamboo shoots to make foods
(b) Different varieties of cheese are known by their characteristic texture, flavour and taste, the specificity coming from the microbe used
(c) Trichoderma sp., free-living fungi, are present in root ecosystems where they act against several plant pathogens
(d) Rhizobium is a symbiotic bacterium that lives in the stem of legumes
Answer : D

Question. Which of the statement given below is incorrect?
(a) Yeast is used in making bread and beverages is a prokaryotic fungus
(b) Streptokinase is produced by Streptococcus and modified by genetic engineering is used as a clot buster
(c) Lipases are added in detergent for removing oily stains from laundry
(d) Pectinases are used in clearing of bottled fruit juices
Answer : A

Question. Which of the following statements is incorrect?
(a) Methanogens are present in human intestine and acts on fibrous component of food
(b) Methanobacterium is a methanogenic bacteria
(c) Methanogens play an important role in the nutrition of cattle
(d) Gobar gas is rich in Methanobacterium
Answer : A

Question. Which of the following statement(s) represents the main benefits of LAB?
I. Increase vitamin-B12 amount, thus increasing nutrient quality of milk.
II. Check disease causing microbes in stomach.
Choose the correct option.
(a) Only I
(b) Only II
(c) I and II
(d) None of these
Answer : C

Question. Consider the following statements.
I. Antibiotics are chemical substances produced by some microorganisms which can kill or retard the growth of other disease-causing microorganisms.
II. Penicillin was the first antibiotic discovered by Alexander Fleming (1928), while working on bacterium Staphylococcus aureus.
III. The function of penicillin as an antibiotic was established by Ernst Chain and Howard Florey.
Which of the statements given above are correct?
(a) I and II
(b) I and III
(c) II and III
(d) I, II and III
Answer : D

Question. Which of the following statements are correct?
I. Wine and beer are produced without distillation of fermented broth.
II. Byproducts of alcoholic fermentation areCO2 and methane.
III. Penicillium species is used for fermenting malted cereals to produce alcohol.
Choose the correct option.
(a) Only I
(b) I and II
(c) II and III
(d) Only III
Answer : A

Question. Sewage or municipal waste should not be directly passed into rivers, streams and other water bodies because
I. it contains human excreta and other organic waste.
II. it contains a number of pathogenic microbes.
Which of the statement (s) given above is/are correct?
(a) Only I
(b) Only II
(c) I and II
(d) None of these
Answer : C

Question. Consider the following statements.
I. After primary treatment of sewage, all solids that settle down forms the primary sludge and the supernatant form the effluent.
II. Spent slurry of biogas plant is used as fertiliser.
Which of the statements given above are correct?
(a) Only I
(b) I and II
(c) Only II
(d) None of these
Answer : B

Question. Consider the following statements about, secondary sewage treatment.
I. In secondary treatment, useful aerobic microbes grow rapidly and form flocs. Flocs are masses of bacteria associated with fungal filaments to form mesh-like structures.
II. The growing microbes consume organic matter and thus, reduce the biochemical oxygen demand.
WhenBODof sewage has reduced, the effluent is passed into settling tank.
III. In settling tank, the bacterial flocs settle and the sediment is called activated sludge.
IV. Asmall part of the sludge is used as an inoculum in the aeration tank and the remaining part is passed into large tanks called anaerobic sludge digesters.
V. In the digesters, heterotrophic microbes anaerobically digest bacteria and fungi in sludge producing mixture of gases such as, carbon dioxide, nitrogen and carbon monoxide which form the biogas.
Which of the statements given above are correct?
(a) I, II, III and IV
(b) I, III, IV and V
(c) II, III, IV and V
(d) I, II, III, IV and V
Answer : A

Question. Consider the following statements about Bt.
I. The bacteria Bacillus thuringiensis (Bt) are used to control butterfly catterpillars.
II. Fresh spores of Bt are mixed with water and sprayed on to vulnerable plants such as brassicas and fruit trees.
III. Insect larvae, after eatingBt ,are killed by the toxin released in their gut.
IV. Bt toxin genes have been introduced into plants to provide resistance to pests.
Which of the statements given above are correct?
(a) I, II and III
(b) I, III and IV
(c) II, III and IV
(d) I, II, III and IV
Answer : D

Question. Which of the following statement(s) is correct?
I. The dough, which is used for making bread, is fermented using Baker’s yeast, i.e. Saccharomyces cerevisiae.
II. Production on an industrial scale, requires growing microbes in very large vessels called fermentors.
III. The municipal wastewater is also called sewage.
IV. It is necessary to treat sewage in Sewage Treatment Plants (STPs) to make it less polluting.
Which of the statements given above are correct?
(a) I and II
(b) Only III
(c) I, II and IV
(d) I, II, III and IV
Answer : D

Question. Which of the following is/are the approache(s) for biological farming?
I. Familiarity with various life forms inhabiting the field.
II. Gain knowledge about the life cycles, patterns of feeding and habitat of predators and pests.
Choose the correct option.
(a) Only I
(b) Only II
(c) I and II
(d) None of these
Answer : C

Question. Read the following statements and select the correct option.
I. Biocontrol refers to the use of biological methods for controlling plant diseases and pests.
II. Use of biocontrol measures will greatly reduce our dependence on toxic chemicals and pesticides.
(a) Both statements I and II are correct
(b) Statement I is correct, but statement II is incorrect
(c) Statement I is incorrect, but statement II is correct
(d) Both statements I and II are incorrect
Answer : A

Question. Read the following statements about disadvantages of chemical agents.
I. Chemicals are toxic and harmful to human beings and animals.
II. Chemicals pollute the environment and plants.
III. Weedicides used to remove weeds also pollute the soil.
Choose the correct option.
(a) I, II and III
(b) I and II
(c) I and III
(d) II and III
Answer : A

Question. Read the following statements.
I. Colostrum is recommended for the newborns because it is rich in antigens.
II. Chikungunya is caused by a Gram negative bacterium.
III. Tissue culture has proved useful in obtaining virus-free plants.
IV. Beer ismanufactured by distillation of fermented grapes.
How many of the statement(s) is/are correct ?
(a) Two
(b) One
(c) Three
(d) Four
Answer : B

UNIT VIII BIOLOGY IN HUMAN WELFARE

Q.1. Release of numerous pest and disease resistant crops have been done in the recent years. They also account for adverse side effects. It has led to the development of "super pests" and "super weeds" which requires more scientific inputs to control them. Considering the above answer the questions given below :

a) What values have been neglected in the above case ?
b) Should we allow the continuation of such practices ? Justify your answer.
c) What steps should be taken to safeguard the natural genes ?

ANSWERS :

a) Concern for the environment, ethics .

b) It should be allowed. Research along these lines are crucial to meet the increase in yield but it should be allowed after properscrutinisation and analysis.

c) Separate gene banks should be maintained for domesticated plant species.

Q.2. Rahul is a small scale farmer and holds 2 acres of land. He would like to increase the yield in his farm. He is not convinced with his  friend's advice of using more fertilizer and pesticides to get better yield. He also plans to have an apiary in his small farm.

Answer the following questions based on the information given above :

a) What values have been promoted in the above case ?

b) Suggest some ways by which Rahul can increase his yield without compromising his ideals.

c) In which way can setting up of an apiary help Rahul ?

 ANSWERS :

a) Concern for his immediate environment and a good intention of passing a healthy farmland to his       descendants.

b) Organic farming using biopesticides and biofertilizers. Adopting proper cropping patterns.

c) Improves the pollination efficiency in crop fields during flowering period and improves yield.

Q.3. More than 25 % of human population is suffering from hunger and malnutrition. Scientists have developed techniques where microbes are grown on industrial scale as a source of good protein which can be grown from waste water , animal manure and even sewage. Based on the above information answer the following questions :

a) What values have been manifested in the above case ?

b) In what ways would it be helpful to humans ?

c) What has been the response to such new ventures ?

ANSWERS :

a) Recycling nutrients and minimizing pollution for the betterment of the environment.

b) Less pollution, able to meet the demand of food as it is rich in proteins , very less ethical problems to face

c) Initially there has been very low response but it has been expected to have high responses as of mushroom culture in the recent years.

Q.4. Scientists have been successful in obtaining somatic hybrids which are tailor made products to meet human needs. One such example is pomato which has the advanced characteristics . People do relish such new entries in the market. Answer the following based on the information given below

a) What values do you think have been fostered or neglected in the above case ?

b) Should research along these lines be encouraged ?Justify .

c) What has been the outcome of such new arrivals ?

ANSWERS :

a) Experiments as opposed to natural products leading to short lived products with side effects.

b) Research can be encouraged with proper scrutinization as the biological significance of such things is also important.

c) There has been an overwhelming response to such new arrivals.

Q.5. People at present are having sufficient food thanks to the green revolution which has helped in the increase of the produce. But they are not having food with sufficient nutritional value. Nearly three billions  people are suffering from micronutrient ,protien and vitamin  differencies or "hidden hunger". So scientists have introduced biofortified crops with vitamins and minerals . This poses a threat to the original domesticated plants and there are chances of loosing the original plants and their wild relatives.

Answer the following questions based on the information given above :

a) What values should be propagated while performing such practices ?

b) Is research along these lines necessary ?

c) Suggest two more methods by which the problem of hidden hunger can be solved .

ANSWERS : 

a)Concern for the health of the human society ie quantitative and qualitative .

b) It is necessary as it is able to solve the problem of malnutrition that is creeping slowly.

c) Good quality breeds can be used for cultivation, supplementary feeds can be given.

Q.6. Ravi maintains a dairy farm and is a successful business man in the eyes of the world. There has been a sudden expansion of his farm which is unbelievable but true. He has been using latest scientific techniques to increase the herd size and also trying to introduce cows which yield milk with medicinal properties. He is aware that there can be adverse effects on the cows due to this.

Answer the following questions based on the information given above :

a) What values have been neglected in the above situation ?

b) Should he continue such research in his farm ?

c) How should the communities react to such cases ?

ANSWER :

a) Empathy towards living organisms, ethical values- live and let live, every organism has its intrinsic value.

b) It should be avoided and alternate ways should be thought of.

C) The communities should check and voice against such atrocities along with the goverment's ban on  such forms.

7. In Delhi, health workers make regular trips to residential areas to check for water stagnation in their homes or coolers or ponds. The residents are also penalized for any error.So when the residents requested their association secretary to protest against it ,he denied their request and called for a meeting.

(a) How would he have explained his actions?

(b) What value does he impart through this?

Ans. Malaria, filariasis and dengue spread through insect vectors, have to eliminate the vectors, avoid stagnation of water in and around residential areas, regular cleaning of coolers and use of mosquito nets.

Values: Awareness, concern, systematic approach.

Q.8. A famous oncologist paid a few visits to the local schools and addressed the teachers on the fear of the rise in cancer cases among women .

a) What do you think he would have talked about?

b) What was the intention behind his visit?

Ans. It is easy to detect cancer these days.
- Latest technique of molecular biology can be used to detect genes in individuals with   inherited susceptibility.
- can also be prevented
- Treatment- is a combination of surgery, radiation therapy and immuno therapy.
- Tumor cells can be eradicated lethally taking proper care of normal tissues. Chemotherapeutic drugs available to  kill only cancer cells.
- Biological response modifiers- interferon-can activate immune system and helps destroy tumor.

Values: Awareness, sensitivity to others and responsibility.

Q.9.Rohit a college student attended a seminar on December 1st on AIDS. Impressed by it he joined an NGO as a volunteer. His first assignment was to a rural village to talk to the youngsters about the disease.

a) What would he have stressed on in his speech?

b) Which value does he speak about here?

Ans. Textual answer

Values: Morality, awareness, sympathy, sensitivity

Q.10. How will you, a student of Biology support  Indian Government's move to eradicat polio through compulsory vaccination for all the children below the age of 5?

textual answer on vaccination and its advantages

Values: Sense of responsibility, conscious towards health.

11. A public school decides to appoint a counsellor to deal with problems in children during adolescence.

(a) How can counseling help children with such problems?

textual answer on role of counselors

Values: Responsibility towards the society, awareness of the changing scenario.

12 . Rahul is managing a farm and wants to do it without harming his environment. How should he go about tackling the pests and adding nutrients to the soil? What values is he trying to practice?

textual answer on biopesticides and biofertilisers

Values: Sensitivity towards environment, critical thinking and decision making

13. Vilappilshala, a village in Kerala is facing waste disposal problem. If you were the district collector, how will you handle the organic waste effectively to make the village self sufficient?

textual answer on setting up of a biogas plant

Values: Public awareness, sensitive to environment and self confidence.

14. A student as a part of his project visited a software company and was surprised to see a sewage treatment plant set up there. He wonders at the role of microbes in one of its steps and specifies it in his project.

(a) How would he have described the role of microbes in sewage treatment plants?
(b) What would he say was the intention of such a set up?

What value would he have imbibed from there?

a)secondary treatment of sewage in detail
b) Purificationof water before dumping it into the source 

Values:-Not ot disturb natural's balance, self  sufficiency develop confidence, concern about the environment

Refer to link below to download CBSE Class 12 Biology VBQs Biology in Human Welfare Set A

UNIT VIII- Biology in Human Welfare

• After a rainy day Rahul found many dragon flies flying over stagnant water. He thinks these flies come to drink water. Is Rahul’s explanation correct? Give your views.

• Nowadays capsules of Spirulina are used as food supplements. Do you recommend the use of these capsules? Why?

• Sunita finds that after few periods of teaching classroom is littered with many small pieces of papers. Next day she delivered a speech in assembly-“if a paper is torn a branch of tree is being destroyed.” Do you agree with Sunita? Give reasons.

• Anita believes that breastfeeding her new born child would spoil her figure and also make her weak. Do you think Anita is right? If not, how would you convince her?

• Delhi govt. has recently decided to ban the sale of Gutka (this fetches them a lot of monetary gain) in the state. Do you support the decision and Why?

• You go to a super market to buy rice. Two types of products are available- one is organically grown and second is conventionally grown. The organically grown crops are costlier so your mother does not want to purchase it. Convince your mother by telling her the advantages of organic foods.

• Municipal Corporation has deputed personnel to check for mosquito breeding in your school.

a) Which are the places they should check for mosquitoes and there larvae?

b) Name to diseases which are spread by mosquitoes.

c) Name any two biological agents which can be used to control mosquitoes 

• Prabha has seen huge garbage dumps outside your school which are not being regularly disposed of by MCD. Prabha discusses the problems with school mates and decide to organize rally to spread awareness among local people about public hygiene.

• Prepare two slogans for rally

• Name any two infectious diseases which may spread due to such unhygienic conditions at public place

• Anand a 14yr old boy thinks smoking makes him more energetic and feel like adult and thus more responsible citizen. He tries to smoke when he is with his peer group. As a friend you have to educate him

• Why he feels more energetic while smoking?

• Effects of CO in smoke

• Other ill effects on body

• Ram is managing a dairy firm. He has been advised to use artificial insemination to overcome several problems in developing better breeds of cow. Govind has advised him MOET for herd improvement. Ram is ignorant and is not able to decide. How will you help Ram regarding

• Which technique should he adopt

• Procedure of new technique

• What is advantage of this technique 

Unit-8 Biology in Human Welfare

• No, Her figure will not be spoilt By telling the advantages of breast feeding.

Values

• Self awareness.

• Sense of responsibility.

• Yes Gutka increases the changes of cancer

Values

• Awareness of Govt. Policies.

• Consciousness to words health

• Advantages of organic farming like – biofertilizers and bio pesticides are used in organic farming which is not harmful to health.

Values

• Sensitivity and awareness about use of harmful chemicals

• Decision making.

• A) water tanks , flowerpots, stagnant water

• Dengue, Malaria

• Gambusia, dragonfly Values

• Observation

• Sensitivity towards health.

1) Any slogans.

2) Diseases like typhoid and amoebiasis.

Values

• Responsibility.

• Sensitivity towards public. Hygiene

• Problem solving.

 i) He fells energetic because nicotine raises blood pressure and increases heart beat. This is not good for his health.

ii) CO binds to hemoglobin and reduces concentration of oxygen 

iii) Any one effort cancer of lung, throat, emphysema. 

Values

 • Awareness about health

• Consciousness

 • Critical thinking.

 I)MOET as success rate of this technique is more

II) Cow is administered hormones, with FSH like activity, to induce follicular maturation and super ovulation-(6-8 eggs). The animal is mated. Fertilized eggs are recovered and transferred to surrogate mother.

III) Herd size is increased in short time. Genetic mother is available for another round of super ovulation. 

Values

• Critical thinking

• Problem solving.

More Questions

Q.1 After a rainy day Rahul found many dragon flies flying over stagnant water. He thinks these flies come to drink water. Is Rahul’s explanation correct? Give your views.

• No, dragon flies eat mosquito larva and act as bio control agents.

Values

• Awareness about environment

• Critical thinking.

Q.2 Nowadays capsules of Spirulina are used as food supplements. Do you recommend the use of these capsules? Why?

• Yes

Any one reason –these are rich in proteins and can be produced in large quantities in less time.

Values

• Awareness.

• Problem solving.

Q.3 Sunita finds that after few periods of teaching classroom is littered with many small pieces of papers. Next day she delivered a speech in assembly-“if a paper is torn a branch of tree is being destroyed.” Do you agree with Sunita? Give reasons.

• Yes, wood is used in manufacturing of paper.

Values

• Sense of responsibility.

• Awareness.

Q.4 Anita believes that breastfeeding her new born child would spoil her figure and also make her weak. Do you think Anita is right? If not, how would you convince her?

• No, Her figure will not be spoilt

By telling the advantages of breast feeding.

Values

• Self awareness.

• Sense of responsibility.

Q.5Delhi govt. has recently decided to ban the sale of Gutka (this fetches them a lot of monetary gain) in the state. Do you support the decision and Why?

• Yes Gutka increases the changes of cancer

Values

• Awareness of Govt. Policies.

• Consciousness to words health

Q.6 You go to a super market to buy rice. Two types of products are available- one is organically grown and second is conventionally grown. The organically grown crops are costlier so your mother does not want to purchase it. Convince your mother by telling her the advantages of organic foods.

• Advantages of organic farming like – biofertilisers and bio pesticides are used in organic farming which is not harmful to health.

Values

• Sensitivity and awareness about use of harmful chemicals

• Decision making

Q.7 Municipal Corporation has deputed personnel to check for mosquito breeding in your school.

a) Which are the places they should check for mosquitoes and there larvae?

b) Name to diseases which are spread by mosquitoes.

c) Name any two biological agents which can be used to control mosquitoes

• A) water tanks , flowerpots, stagnant water

• Dengue, Malaria

• Gambusia, dragonfly

Values

• Observation

• Sensitivity towards health.

Q.8 Prabha has seen huge garbage dumps outside your school which are not being regularly disposed of by MCD. Prabha discusses the problems with school mates and decide to organize rally to spread awareness among local people about public hygiene.

           • Prepare two slogans for rally

           • Name any two infectious diseases which may spread due to such unhygienic conditions at public place

• 1) Any slogans.

2) Diseases like typhoid and amoebiasis.

Values

• Responsibility.

• Sensitivity towards public. Hygiene

• Problem solving.

Q.9 Anand a 14yr old boy thinks smoking makes him more energetic and feel like adult and thus more responsible citizen. He tries to smoke when he is with his peer group. As a friend you have to educate him

       • Why he feels more energetic while smoking?

       • Effects of CO in smoke

       • Other ill effects on body

• i) He fells energetic because nicotine raises blood pressure and increases heart beat.

This is not good for his health.

ii) CO binds to hemoglobin and reduces concentration of oxygen

iii) Any one effort cancer of lung, throat, emphysema.

Values

• Awareness about health

• Consciousness.

• Critical thinking.

Q.10Ram is managing a dairy firm. He has been advised to use artificial insemination to overcome several problems in developing better breeds of cow. Govind has advised him MOET for herd improvement. Ram is ignorant and is not able to decide. How will you help Ram regarding

       • Which technique should he adopt

       • Procedure of new technique 

       • What is advantage of this technique

• I)MOET as success rate of this technique is more

II) Cow is administered hormones, with FSH like activity, to induce follicular maturation and super ovulation-(6-8 eggs). The animal is mated. Fertilized eggs are recovered and transferred to surrogate mother.

III) Herd size is increased in short time.

Genetic mother is available for another round of super ovulation.

Values

• Critical thinking

• Problem solving.