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Exam Class 12 2020 : Biology

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Pritam Shaw
Loyola High School, Kolkata

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ISC MOCK TEST SET I FOR THE UPCOMING ISC BIOLOGY 2019 FOR 14.3.2019 CLASS XII [SESSION 2018-2019] BIOLOGY Time: 3 Hours + 15 Minutes Reading Time Maximum Marks - 70 -----------------------------------------------------------------------------------------------------------------------GENERAL INSTRUCTIONS This paper comprises of TWO PARTS Part I and Part II. Answer all questions. Part I is compulsory .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: [8] (i) State one medical application of alpha -1- antitrypsin and cyclosporin A. (ii) Name the initiation codon and termination codon of protein synthesis. (iii) A bilobed dithecous anther has 100 MMC per microsporangium. How many male gametophytes this anther can produce ? (iv) State the uniqueness of Bamboo plant. Also state its botanical name. (v) What conditions are necessary for cryopreservation? (vi) Mention the importance of LH surge during menstrual cycle. (vii) What is the biological significance of Golden rice production? (viii) What are molecular scissors? State one of its significance in molecular biology. (b) Each of the following questions has four choices. Choose the best option in each case: [4] (i) The phenomenon wherein, the ovary develops into fruit without fertilization is: (1) Clone (2) Apomixis (3) Polyembryony (4) Parthenocarpy (ii) When a person suffering from AIDS, the first symptom appears: (1) RNA genome of the virus replicates (2) Macrophages produces viruses (3) Number of T lymphocytes decreases (4) Viruses enters into helper T cells. (iii) Variation in population that occurs by chance is: (1) Seawall Wright effect (2) Bottle neck effect (3) Hardy Weinberg effect (4) Genetic erosion (iv) After ovulation in a female mammal, the structure which is formed by ruptured follicle is: (1) Graafian follicle (2) Corpus albicans (3) Zona pellucida (4) Corpus luteum (c) Give one significant contribution of each of the following scientists: (i) Alec Jefferey (ii) Henking (iii) Jacob & Monad (iv) Luc Montagnier (v) Paul Ehrlich (vi) Chargaff (vii) Sanger (viii) Gamow [4] P.T.O. (d) Define the following: (i) Amniocentesis (ii) Niche (e) Give reasons for the following: (i) Retroviruses can t be directly inserted into the host organisms. (ii) The rate of ozone depletion is greater in Antarctica. [2] [2] PART II SECTION A (14 Marks) (Answer all questions) Question 2 [2] (a) Draw a labelled diagram of T.S. of anther. OR (b) Draw a labelled diagram of Replication of Retrovirus. Question 3 [2] Mention the cause and one symptom each of Turner s syndrome and Klinefelter syndrome. Question 4 [2] State four causes of the loss of biodiversity Question 5 [2] The following sequence is a segment of a template DNA strand. 3 .GCAGCCATTTAG 5 . Write the corresponding sequence for the mRNA strand transcribed from it. Also mention the number of amino acids produced from the given mRNA strand. Question 6 [2] State the important role of the following enzymes in molecular biology. (a) DNA Polymerase (b) RNA Polymerase (c) Topoisomerase (d) SSBP Question 7 [2] Mention the important Contribution of Ramesh Chandra Dagar. Define FOAM. Question 8 [2] (a) List the specific symptoms of dengue. Name its causative agent and vector OR (b) Explain the structure of a typical antibody molecule SECTION B (21 Marks) (Answer all questions) Question 9 [3] (a) Explain briefly the three types of natural selection. Cite a graphical analysis for each of them. OR (b) Explain briefly the different modes of endosperm development in angiosperms. Question 10 [3] State the basic technique involved in DNA finger printing. Question 11 [3] Explain how Humulin can be produced using recombinant DNA technology Question 12 [3] Define Polyblend & Eutrophication . State the objective of Montreal Protocol Question 13 [3] Describe briefly the Miller and Urey experiment on the origin of life with the help of neat labelled diagram. Question 14 [3] What is Integrated Pest Management? State its various methods. Why Biofertilizers are preferred over chemical fertilizers? P.T.O. Question 15 (a) Enumerate the different steps involved in MOET technology. OR (b) Explain the steps involved in the process of DEcomposition. [3] SECTION C (15 Marks) (Answer all questions) Question 16 [5] (a) Explain the process of spermatogenesis and also state its hormonal control in human males OR (b) Explain the physico-chemical process involved in human fertilization. Cite a labelled diagram to explain your answer. Question 17 [5] (a) Explain briefly with the help of flow sheet diagram of the Life cycle of a malarial parasite. OR (b) Explain briefly the elongation of giraffe s neck according to Lamarck and Darwin. Question 18 [5] (a) How has biotechnology been useful in controlling nematode infection in plants? Explain briefly the technique involved in this process? OR (b) Describe briefly the development of female gametophyte in angiosperms. -----------------------------------------------xxxxxxxxxxx-------------------------------------------------------- Prepared by:- Mr. Sumit Roy [Biology Teacher] (9830431393/7980174076) Post Graduate Diploma in Environmental Biotechnology (C.U.) M.Sc (Zoology), Gold Medalist of Vidyasagar University, B.Ed E mail: - sumitroy888@gmail.com sumit@ssa.org.in

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