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KENDRIYA VIDYALAYA SANGATHAN MODEL QUESTION PAPER-2019 BLUE PRINTSl No.NAME OF THE UNITVSA (1)SA1(2)SAII (3)LA (5)NO. OF QUESTIONSTOTAL MARKS1REPRODUCTION1(1)1(2)2(6)1(5)5142GENETICS AND EVOLUTION1(1)3(6)2(6)I (5)7183BIOLOGY AND HUMAN WELFARE2(2)-----4(12)-----6144BIOTECHNOLOGY AND ITS APPLI CATION-----2(4)2(6)----4105ECOLOGY AND ENVIRONMENT1(1)1(2)2(6)1(5)514TOTAL571232770 CLASS—XII(BIOLOGY) KENDRIYA VIDYALAYA SANGATHAN BHUBANESWAR REGIONMODEL QUESTION PAPER -2019CLASS—XIISUB—BIOLOGYTime allowed: 3hrs. Maximum Marks: 70General InstructionAll questions are compulsory.i) Section A contains question number 1 to 5, Very Short Answer type questions ofone mark each.ii) Section B contains question number 6 to 12, Short Answer type- I questions of twomarks each.iii). Section C contains question number 13 to 24, Short Answer type- II questions ofthree marks.iv) Section D contains question number 25 to 27, Long Answer type-III questions of fivemarks each.v) Internal choice is given in all sections, an internal choice is provided in two questions of one mark, two questions of two marks, and four questions of three marks, and all the three questions of five marks. A student is to attempt only one alternative in such questions.vi) Wherever necessary, the diagram drawn should be neat and properly labelled.Section – AName the two group of plants where water is the medium for transport of male gametes. ORHow many chromosomes do drones of honey bee possess? Name the type of cell division involved on the production of sperm. 2. A cross between two tall pea plants resulted in offspring having few dwarf plants. What would be the genotypes of both the parent? 3. Why is south Indian sugar cane preferred by agriculturist? 4. What was the idea of early Greek thinkers about origin of life? 5.Name the mechanism that promotes the co-existence of the closely species of warblers in a competitive environment. Who showed this? OR Mention two advantages for preferring CNG over diesel as an automobile fuel.Section B6. In to which structure does the head of spermatozoa remain embedded after formation? Name the hormones secreted by this structure. ORName any two hormone releasing IUDs, List two reasons that make them effective contraceptives.7. Both hemophilia and thalassemia are blood related disorder in humans. Write their causes and the difference between the two. Name the category of disorder they both come under. 8. List any four techniques where the principle of ex-situ conservation of biodiversity has been employed.center52705 9.a) b) Write the function of A.10. Write the role of ori and restriction site in cloning vector pBR322. ORa) Name the genes responsible for making Bt cotton plant resistant to bollworm attack. b) How do such plants attain resistance against bollworm attack? Explain.11.a) Select the analogous structures from the combinations given below. i) Forelimbs of whales and bats. ii)Eyes of octopus and mammals iii)Tuber of sweet potato and potato. iv) Thorns of bougainvillea and tendrils of Cucurbita. b) State the kind of evolution they represent.12.a) Name the deficiency for which, first clinical gene therapy was given. b) Mention the causes and one cure for this deficiency.Section C13. Draw the labelled schematic sketch of replication fork of DNA. State the function of enzyme DNA polymerase. ORCompare and contrast he theory of evolution proposed by Darwin and Hugo De Vries.14.a) When and how does placenta develop in human female? b) How is placenta connected to the embryo?15.a) Describe the endosperm development in coconut. b) Why is tender coconut considered a healthy source of nutrition.c) How are pea seeds differ from castor seeds with respect to endosperm. OR Draw the diagram of a microsporangium of an angiosperm, label any four parts. State the function of innermost layer.16. A cross is made between two different homozygous pea plants for contrasting flower position. a) Find out the position of flower in parent and in F1generation on the basis of genotypes. b) Compute the relative fraction of various genotypes in the F2generation.17. a) Name the causative agents of Typhoid in humans. b) Name the test administered to confirm the disease. c)How does the pathogen enter the human body? write two diagnostics symptoms.18. What is single cell protein? Name two organisms produce it, what is the significance of such a protein.19. How have transgenic animals proved to be beneficial in a) production of biological products b) Chemical safety testing. ORDescribe the roles of heat, primers and the bacterium Thermus aquaticus in the process of PCR.20. a) How is activated sludge produced during sewage treatment?b) Explain how this sludge is used in biogas production. 22320924896421.22.a) Name the genus to which baculovirus belong. b) Describe their role inintegrated pest management.23. Alien species are highly invasive and are a threat to indigenous species. Substantiate this statement with any three examples.24.Differentiate between primary and secondary succession. Provide one example of each. ORIn a pond there were 200 frogs.40 more were born in three years. Calculate the birth rate of the population.Population in terms of no. is not always a necessary parameter to measure the population density. Justify with two examples.Section D25.a) When a seed of an orange is squeezed many embryos, instead of one are observed. Explain how it is possible.b) Are those embryos genetically similar or different.ORa) Explain the following phases of menstrual cycle of a human female. i) Menstrual phase.ii)Follicular phaseiii)Luteal phaseb) A proper understanding of menstrual cycle can help immensely in family planning. Do you agree with the statement? Provide reason for your answer.26.Which methodologies is used while sequencing the total DNA from a cell? Explainit in detail. Name scientist who first developed the principle of sequencing DNA.ORWhat is operon? Who first proposed the lac operon. b) Why is lac operon considered to be regulated by its substrate? Explain with diagram.27. a) What is an ecological pyramid? Compare the pyramid energy, biomass and numbers.b) Write any two limitation of ecological pyramid. OROn seeing the bad state of road in your locality, as a student you have recommended to the Municipal corporation to use polyblend.i)What is polyblend? Point out its raw material.ii) How will it be advantageous?What is e-waste? Explain the method of their disposal. MARKING SCHEMECLASS—XII(BIOLOGY)Q.NO. ANSWERSMARKS1Bryophytes & Pteridophytes.OR Drone has16 chromosomes. Mitosis is involved in the production of sperm.1/2+1/2=12Both parents should be heterozygous, their genotypes are Tt, Tt1/2+1/2=13Saccharum officinarum growing in south India has thicker stem &high sugar content.14Units of life called Spores were transferred to different planets including Earth. (Panspermia)15Resource partitioning,Mac Arthur.ORBurns efficiently leaving no residues/ cheaper than petrol or diesel/cause less pollution/cannot adulterated. (any two)1/2+1/2=16Sertoli cells, lytic enzyme/hyaluronidase. OR Progestart, LNG-20 Function- i) make the uterus unsuitable for implantation ii) the cervix become hostile to sperm.1+17Hemophilia--Single protein in clotting of blood is affected,) sex linked disorder, blood does not clot. Thalassemia—defect in synthesis of globin leading to formation of abnormal hemoglobin, Autosomal recessive disorder, result in anemia. (any two)1+18Cryopreservation/in-vitro fertilization/micro propagation/tissue culture sperm bank/gene bank (any four)1/2x4=29a) Promoter b) coding strand, Function of A—It initiates transcription with help of sigma factor and RNA polymerase.1/2+1/2=1Function-110Ori—the site where replication starts, this site is responsible for copy no.Restriction site is the site of ligation of F.DNA/Alien DNA in the vector/antibiotic resistance site.ORa) Bt cotton has cryIAc/cryIIAb genes. These genes produce crystals of proto toxin. b) when boll worm bites the cotton fruit it consumes the toxic insecticidal protein, alkaline PH activates the toxin, lysis of cell wall of mid gut, death of the insect.1+111a) ii and iii are analogues structure b) convergent evolution1+112Adenosine deaminase deficiency (ADA). b) cause- Deletion of ADA gene. Cure--Bone marrow transplantation/enzyme replacement therapy/genetically engineered lymphocytes/introducing gene coding ADA at embryonic stage1/2+1/2+1=2(Any two)13Diagram with four labellingFunction of DNA polymerase –i) catalyses the polymerization of de-oxy ribonucleotide 5’—3’ direction on DNA template strandii)It polymerise with high accuracy. /proof reading ORDarwin’s theory-i) variation cause evolution i) variations are small and directional. iii)evolution is gradual.Hugo De Vries mutation---i) mutation cause evolution ii) mutation are random direction less iii) sudden mutation cause speciation.(saltation)2+1/2+1/2=3OR1+1+1=314After implantation of blastocyst in uterus, from trophoblastIt develops chorionic villi surrounded by the uterine tissue and maternal blood and integrated with each other to form placenta.1+1+1=315PEN develop in to free nuclear (coconut water), then cell wall formation, cellular endosperm (white kernel) b) because it is rich in nutrients and mineralsl.c) In pea endosperm is completely used up, but in castor it remains intact in mature seed.OrDiagram with four labelling. Function of inner most layer, Tapetum—provide nourishment to the developing pollen grain.1+1+1/2+1/2=3OR2+1=316Axial and terminal, F1—Axial positionF2 ratio-- 1:2:1 (show the cross)1+2=317Salmonella typhi, b) widal test Contaminated water/food d) constant high fever/ stomach pain/loss of appetite/weakness (any two)1+1+1=318The biomass obtained from microorganism like spirulina, methylophyllus, methylotrophus processed in the industry to use as food.Significance—reduce environmental pollution / organic waste from industry, provide protein rich diet, fulfill the demand of protein in human diet. (Any two)1+2=319a) Rosie the transgenic cow, produce human protein containing human alpha lactalbumin other transgenic animal produces 2-1-antitrypsinb) Toxicity testing –Transgenic animals are more sensitive to toxic substances, so the results are obtained in less time.ORHeat-denatures or helps in separation of DNA into two strands.Primer—Enzyme DNA Polymerase extend the primers using the nucleotides provided in the reaction on the genomic DNA as template.Thermus aquaticus--- it is the source of thermostable DNA polymerase orTaq polymerase.2+1=3OR1+1+1=320a) sedimented bacterial and fungal filament(flocs) b) used as inoculum.c) Activated sludge digested by anaerobic bacteria in anerobic sludge digester to produce biogas (CH4, H2S, CO2)1+1+1+1=321Exponential or J shape b) logistic or S shape growth curve;c)K-carrying capacity, C) -indicates population density1+1+1/2+1/2=322Genus- Nucleo polyhedro virusRole—sps. specific, no negative impact on plants, mammals, birds, fish and non-targeted insects. (IPM)1+2=323I)Nile perch introduce into Lake Victoria in east Africa led to the extinction of cichlids fish. ii)Parthenium /Lantana /Eicchornia invasive plant pose a threat to native species. iii) Introduction of African cat fish (clarias garipinus) to an aqua culture is a threat to Indigenous cat fish.1+1+1=324Primary succession-i) begins when no organism ever existed, ii) establishment of biotic communities are very slow e.g.—newly evolved lava/bare rock/newly created pond/reservoir.Secondary succession—i) where natural biotic communities were destroyed, ii) faster e.g.—abandoned farm land/cut forest/burnt forest land.ORi)Birth rate-no. of individuals born/total no. of individuals=40/200=0.5frog per 3 years.ii)Nos. is not always a necessary parameter to measure the density. For e.g. comparison of 200 parthenium plants witha single banyan tree having large canopy, percentage cover or biomass is more accurate measure for density. iii) microbial population in cultured Petri dish where counting is impossible.Difference-2+1(Example)=325polyembryony occurs due to i) formation of more than one embryo in an ovule. ii)development of cells like synergids/cells of nucellus into embryo iii) formation of more than one egg in an embryo sac.yes, all are diploid(2n), as they develop without fertilization.ORi)menstrual phase ii) follicular phase iii) luteal phaseyes, awareness regarding the possibilities of fertilisation can be avoided due to coitus during 10-17 days of menstrual cycle.4+1=5OR3+2=526i)Expressed sequence tags (ESTs) with explanationii)Sequence annotation -explanationiii)Frederick Sanger.ORi)An operon is a polycistronic structural gene which is regulated by a common promoter and regulator gene. ii)proposed in1961 by Jacob and Monod.Switching on and switching of operon in presence or absence of inducer (lactose) with diagram.2+2+1=5OR1+1+3=527Definition of pyramid.Pyramid of energy is always upright because energy is always lost as heat at each step.Pyramid of number and biomass may be inverted in Tree ecosystem and aquatic ecosystem with explanation.Limitation of pyramid---I) It never considers the same species belonging to or more trophic levels. Ii)It assumes a simple food chain which never exist in nature. iii) there is no position for saprophytes/decomposers. (any two)ORPolyblend is the fine powder of recycled modified plastic. Raw material--- recyclable plastic waste and bitumen. Advantages— i) it can be used to lay road. ii) enhance the bitumen’s water repellant properties. iii) increase the road life. (any two)Irreparable computers and other electronic goods are the known source of e-waste. E—waste is buried in landfills or incinerated. recycling is the only solution1+2+2=5OR1+1++1+2=5SEPHALI TRIPATHYPGT (BIO)K.V NO.1 BHUBANESWAR (1ST SHIFT) ................
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