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BLUE PRINT(BIOLOGY)CLASS : XIIS.NOTYPE OF QUESTIONSVSA(1 MARK)SA II(2 MARKS)SA I(3 MARKS)LA(5 MARKS)TOTAL1.Reproduction1(1M)1 (2M)2(6M)1(5)14(5)2.Genetics and evolution2(2M)1(2M)3(9M)1(5)18(7)3.Biology in Human welfare1(1M)2(4M)3(9M)-14(6)4.Biotechnology and its Applications1(1M)-3(9M)-10(4)5.Ecology and Environment-3(6M)1(3M)1(5M)14(5)Total5(5)7(14)12(36)3(15)70(27)KENDRIYA VIDYALAYA SANGATHAN,BHUBANESWAR REGIONCLASS:- XII SUB:- BIOLOGY THEORY (044) TIME :- 3.00 HRSMax.Marks:-70GENERAL INSTRUCTIONS:-1. All questions are compulsory.2. This question paper consists of four sections A,B,C and D . 3.Section A consists of 5 questions which are very short type carrying 1 mark each to be answered in one word or one sentence.4. Section B consists of 7 questions which are shot answer type carrying 2 marks each to be answered in about 20-40 words each. 5. Section C consists of 12 questions which are also short answer type carrying 3 marks each to be answered in about 40-60 words each.6.Section D consists of 3 questions which is a long answer type carrying 5 marks each and to be answered in about 80-100 words .3. There is no overall choice. However an internal choice has been provided in two questions of one mark, two questions of two marks, four questions of three marks and all the three questions of five marks weightage. A student has to attempt only one of the alternatives in such questions. 4. Wherever necessary, the diagrams drawn should be neat and properly labeled. *******SECTION -A1. What are the asexual reproductive structures in a) Bryophytes b) Sponges 2. Write the similarity between the wing of a butterfly and the wing of a bat. What do you infer from the above with reference to evolution?OR Why it is considered that the fore limbs of human are homologous with that of horse even though they have a same basic plan and structure? 3. How does tRNA act as an adapter molecule during translation?4. Name 2 products of bee keeping?5. Name the enzyme that is used to dissolve cell wall of bacteria and plant.OR What is the host called that produces a foreign gene product? What is this product called?SECTION-B.6. What is global warming? List two strategies for reducing global warming?7. How do implants act as effective method of contraception in human females? Mention its one advantage over contraceptive pills?OR Mention any four possible side effects of contraception?8 . Name the kind of disorder /diseases that are likely to occur in human, if a) mutation in the gene that codes for an enzyme, phenylalanine hydroxylase occurs? b) the karyotype is XXY.9. Name the type of interaction in each of the following. The interaction that is a) Beneficial to both the species b) detrimental to both the species c) Beneficial to one species but the other species unaffected d) Beneficial to one species but harmful to the otherOR Desert lizards manage to keep their body temperature constant even though they lack physiological capacity like mammals to do so. How are they able to do so? 10. How can healthy potato plants be obtained from a desired potato variety which is viral infected?11. List any four techniques where the principle of ex. Situ convervation of biodiversity has been employed?12. Write the specific symptoms of pneumonia .Name the causative organism.SECTION-C13. Why are some seeds referred to as apomictic seeds? Mention one advantage and one disadvantage to a farmer who uses them?14. Enlist the changes that take place during Luteal phase of the Menstrual cycle.OR a)draw the neat diagram of the T.S of human ovary and label i) Corpus luteum ii) secondary oocyte iii) Antrum iv) Primary follicle15. a)Differentiate between euchromatin and heterochromatin. b) Mention the role of non-histone chromosomal protein.16. Explain how innate immunity is achieved by the following barriers? a) Physical barrier b) Physiological barrier c) Cellular barrier OR a) What is allergy? b) How is determined that an individual is allergic? c) Is allergy is linked to modern life style? Explain? 17. a) What are molecular scissors? Give one example? b) Explain their role in rDNA technology?18. How do organisms manage with stressful conditions existing in their habitat for short duration? Explain with the help of one example each? 19. Observe the following figure and answer the questions that follow:1. Name the insect displayed in the figure?2. Explain the mechanism? 20. a) Name the sugarcane variety grown in North India? b) What are the qualities exhibited by Saccharum officinarum ? c) Explain the crossing of the two varieties with desirable qualities?21. How does the gene therapy help patients with ADA- deficiency? ORMention the cause and the body system affected by ADA deficiency in humans?Name the vector used for transferring ADA-DNA into the recipient cells in humans. Name the recipient cells. 22. Observe the following figure and answer the questions that follow:1. Identify the above diagram?2. Name the steps 1, 2 and 3.3. Explain the steps 1.2 and 3.23. a) Baculoviruses are excellent candidates for integrated pest management in ecologically sensitive area. Explain giving reasons. b) What is organic farming? Why it is suggested to switch over to organic farming? OR a) What is bio fortification? b) What are the objectives of bio fortification?24. Plasmid is a boon to biotechnology? Justify the statement quoting the production of human insulin as an example?SECTION –D25. a) Which events are collectively termed as post fertilization events in a flower? Name them? b) Describe the stages of development of embryo in a dicot? OR a) Write two advantages of seeds to mankind? b) State what is apomixes? Comment on its significance? How it can be commercially used?26. a) What is Pedigree analysis? Write 2 of its advantages? b) Why do generally human males suffer from Hemophilia? Can woman also suffer from it? ExplainOR a) Why did Morgan select Drosophila for his experiments? b) What Henking observed in insects? What is it called now?27. a) What is altitude sickness? How it is caused? How does human body try to overcome altitude Sickness? b) How does our body maintain constant temperature during winter, when the outside temperature is much lower than our body’s temperature? OR a) Explain co-evolution with reference to parasites and their hosts? Mention any four special features evolved in parasites for their parasitic mode of life? b) How would you measure population density in the following cases? i) Fish in a lake ii) Tiger census in a national park iii) Single huge banyan tree with large canopy?MARKING SCHEME-SET-01CLASS –XII SUBJECT:- BIOLOGYS.NOEXPECTED ANSWERVALUE POINT(S)TOTAL1.A. Gemma cups b. Gemmules?+1/212.Analogous organs and convergent evolution OR As they have different needs. ?+1/2113.On one hand it reads the codon of mRNA and bind swith amino acid on the other. ?+1/214.Honey and bee wax.?+1/215.Lysozyme and celluloseOR Transgenic organism and Recombinant protein ?+1/216.The phenomenon of increase in the global temperature by greenhouse gases in the atmosphere.Cutting down use of fossil fuel, improve efficiency of energy usage, reducing the deforestation, planting trees etc.?+1/2+127.They are progestogens or progestogen-oestrogencombinations.Implants act in the same way as the pills but they are effective for a longer period. ORNausea, abdominal pain, break though bleeding, irregular menstrual bleeding and even breast cancer or any other1+14X1/228.i) Phenylketonuria ii) Klinefelter’s syndrome1+129.a) Mutualism b) Competition c) Commensalism d) Parasitism or Predation ORORThey bask in the sun and absorb heat when the body temperature falls below comfort zone and move to shade when ambient temperature starts rising.?*41+1210.In virus infected plant, the meristem is free of virus. Hence one can remove the meristem and grow it in vitro to obtain virus free plants.1+1211.Protected maintenance of threatened species in a. zoological parks, b. Botanical gardens c. Cryopreservation of gametes d. Tissue culture propagation.Any 2(1+1)212.High fever, chest pain, chills, headache difficulty in breathing Streptococcus pneumonia and Haemophilusinfluenza.?+1/2+1213.In some sps, seeds are formed without fertilization either from the diploid egg cell or from diploid nucellar cells.Such seeds maintain the parental character. However they do not show genetic variation. 2+1314.The ruptured follicle is transformed into corpus luteum.It secretes hormone called progesterone, which is essential for maintenance of endometriumDuring pregnancy all events of the menstrual cycle stop and there is no menstruation. OR I) Correct and neat diagram ii) 4 labelling1+1+11?*4315.A) In a nucleus some regions of chromatin and loosely packed and stain light is called euchromatin and some are tightly packed and stain darker called heterochromatin.B)The packaging of chromatin at higher level requires addityional set of proteins called non-histone chromosomal proteins.1.5+1.5316.a) these include skin and mucus coated epithelium of respiratory,gastrointestinal and urinogential tractsb) Acid in the stomach, saliva in mouth, tears from eyes etcc) Threse are special cells which phagocytose and destroy cells,PMN Leukocytes.ORA) The exaggerated response of the immune system to certain antigens present in the environment.b) The patient is exposed to allergic substance and the reaction is monitoredc) Yes, the modern life style and protected environment provided during early period of life resulting in lowering of immunity.?*6=3317.a) restriction enzymes are molecular scissors as they cut the DNA are specific sites, exampleb) Cutting of restriction enzymes, formation of sticky ends,DNA Ligase later joining the segments. Restriction enzymes are thus used in genetic engineering.1+1+1318. By migration and suspending their activitiesMigration- to move away from stressful conditions into a more hospitable area eg. BirdsBy suspending the activities- Those animals which are uinable to migrate avoid the stress by escaping in time, aestivation, hibernation.1.5+1.5319.a. Peppered moth( Bistonbetularia), b) Mechanism of Industrial melanism1+2320.SaccharumbarberiHas thicker stems and higher sugar content but did not grow well in North IndiaThey were crossed to obtain desirable qualities of high yield, thicker stems and high sugar content.1+ 1+1321. Correct answer- Gene therapy OR A) ADA deficiency, the immune system313B) use of retroviral vector into lymphocyctesswhich are subsequently returned into the patient.222.1. PCR reaction2. Denaturation, Annealing and Extension3. Brief explanation of the steps.12323.a. Species specific, narrow spectrum insecticidal applications. They do not show negative impacts on plants mammals and birds fishes and even non-target organism.b. It is the farming of plants with no fertilisers or with minimum fertilisers.ORA) correct definitionb) 4 objectives, proteitn content and quality, oil content and quality vitamin content and quality and micronutrient and mineral content.2+11?*4324.Autonomously replicating extra chromosomal circular DNA found in bacterial cells.It is used as vector in rDNA technology.Eli Lily company and its preparation of Insulin with rDNA technology.1+2325.Post fertilization events of a flower25Different stages of developement of embryo including pro emvryo,globular embryo, heart shaped embryo and mature embryoDiagrams related to these stages21 ORAny 2 advantages of seeds to mankind1Apomixis and its significance2+226. a) definition of pedigree anlaysis + 2 advantsges1+15b) correct explanation of haemophilia3 ORa)4 reasons for selecting Drosophila 2b)Correct explanation of Henking observation and X chromosome 2+1527.a) correct explanation .35b) shivering a kind of exercise which produces heat and raises the body temperature2 ORa) co-evolution with respect to hosts and parasites Any 4 adaptive features of the parasites.b)i) fish caught per trap- gives a measure of relative density of different sps of fish present in the lakeii) Pug marks and faecal pellets- gives a measure of tiger living in an unit areaiii) Percent cover or biomass- is more meaningful measure of the population size of plants like a huge banyan tree. 1+225********** ................
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