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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.

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