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Class 12 ISC Prelims 2018 : Biology (Bishop Moore Vidyapith (BMVM), Mavelikara, Alappuzha)

5 pages, 53 questions, 20 questions with responses, 23 total responses,

Abel Samuel
Bishop Moore Vidyapith (BMVM), Mavelikara, Alappuzha

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BISHOP MOORE VIDYAPITH, MAVELIKARA SECOND MODEL EXAMINATION 2017-18 BIOLOGY PAPER 1 (THEORY) (Maximum Marks: 70) (Time allowed: Three hours) (Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time) ---------------------------------------------------------------------------------------------------------------This paper comprises of TWO PARTS Part I and Part II. Answer all questions. Part I contains twenty questions of one mark each. Part II consists of Section A, B & C. Section A contains seven questions of two marks each Section B contains seven questions of three marks each, and Section C contains three questions of five marks each. Internal choices have been provided in two questions in Section A, two questions in Section B and in all three questions of Section C. ---------------------------------------------------------------------------------------------------------------PART I (20 Marks) Answer all questions. Question 1 (a) Answer the following questions briefly and to the point: (i) Name the part of an angiosperm flower in which development of male gametophyte takes place. (ii) State the role of C-peptide in human insulin. (iii) Name the parts of the pistil which develops into fruits and seeds. (iv) Why are spores of Bacillus thuringiensis used as bio-insecticide? (v) When and how does implantation occur in human beings? (vi) Define population explosion. (vii) Name the source of erythromycin and gentamycin. (viii) Why is fertilization in flowering plants known as double fertilization? (b) Each of the following questions has four choices. Choose the best option in each case: (i) Which one is an edaphic factor in biosphere? (1) Light (2) Temperature (3) Soil (4) Water ISC BIOLOGY SECOND MODEL EXAMINATION 2017-18 [8 1] [4 1] Page 1 (ii) Embryo sac is found in: (1) Endosperm (2) Embryo (3) Ovule (4) Seed (iii) Analogous organs arise due to: (1) Divergent evolution (2) Artificial selection (3) Genetic drift (4) Convergent evolution (iv) PCR is required for: (1) DNA synthesis (2) DNA amplification (3) Protein synthesis (4) Amino acid synthesis (c) Give one significant contribution of each of the following scientists: (i) M.S. Swaminathan (ii) P. Maheshwari (iii) E. Wilson (iv) R. Mishra [4 1] (d) Define the following: (i) Geitonogamy (ii) Soma clonal variation [2 1] (e) Give reason: [2 1] (i) Lactational amenorrhea acts as a natural contraceptive. (ii) Son of carrier mother and normal father suffer from haemophilia whereas the son of a haemophilic father and a normal mother would not. PART II SECTION A (14 Marks) (Answer all questions) Question 2 (a) Explain two methods for the introduction of rDNA into the host cell. [2] OR (b) (i) What is gel electrophoresis? (ii) Name an enzyme used to isolate DNA from plant cell. ISC BIOLOGY SECOND MODEL EXAMINATION 2017-18 Page 2 Question 3 Identify the inheritance pattern in the following picture and give reasons to support your answer: [2] Question 4 Give the characteristics of wind pollinated flowers. [2] Question 5 What are ecological hotspots? Name the important hotspot areas in India. [2] Question 6 What are the strategies to be adopted to reduce global warming? [2] Question 7 Differentiate between simple stirred tank bioreactor and sparged stirred tank bioreactor. [2] Question 8 (a) What is the significance of -1 antitrypsin? [2] OR (b) What is GEAC and what is its role? SECTION B (21 Marks) (Answer all questions) Question 9 (a) Explain Hershey and Chase s experiment. [3] OR (b) Explain Messelson and Stalh s experiment. ISC BIOLOGY SECOND MODEL EXAMINATION 2017-18 Page 3 Question 10 [3] How does the megaspore mother cell develop into seven celled , eight nucleated embryo sac in angiosperm? Draw a labelled diagram of a mature embryo sac. Question 11 What is species-area relationship? Show it with the help of a graph. [3] Question 12 Give a graphical representation of the lifecycle of plasmodium. [3] Question 13 Explain multiplication of retrovirus in the infected human cell with diagram. [3] Question 14 Study the graph given below and answer the questions that follow. [3] (i) (ii) What are the uterine events that take place according to the hormonal levels on: (a) 6-15 days (b) 16-25 days Specify the sources of hormones mentioned in the graph. Question 15 (a) What is sewage? Explain the stages of sewage treatment. [3] OR (b) Define apiculture and pisciculture and give two advantages of each. ISC BIOLOGY SECOND MODEL EXAMINATION 2017-18 Page 4 SECTION C (15 Marks) (Answer all questions) Question 16 (a) Briefly explain the factors affecting Hardy Weinberg equilibrium OR [5] (b) Define: (i) Dihybrid cross (ii) Homologous Chromosomes (iii) Polygenic inheritance (c) Differentiate between: (i) Transition and transversion (ii) Euploidy and aneuploidy Question 17 (a) Expand the following terms and explain them briefly: (i) IUCN (ii) IRRI (iii) LSD (iv) VNTRs (v) IMR [5] OR (b) What are ecological pyramids? Explain three types of ecological pyramids. Construct each pyramid and label different trophic levels. Question 18 [5] (a) Answer the following questions: (i) If 10000 K Cal energy is available at the level of producers, calculate the amount of energy at the level of secondary consumer. (ii) A snapdragon plant with red flowers was crossed with a plant with white flowers. It produced pink progeny in the F1 generation. Explain the principle of inheritance involved with the help of Punnet square. OR (b) Describe the process of DNA replication in prokaryotes. ISC BIOLOGY SECOND MODEL EXAMINATION 2017-18 Page 5

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