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ISC Class Prelims 2021 : Biology : I Pre Board Examination

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AMBASSADOR SCHOOL DUBAI, UAE PRE-BOARD-1 2020-21 Grade: 12 Subject :Biology Date:26/11/20 Marks: 70 Time: 3 hours INSTRUCTIONS This paper comprises of TWO PARTS Part I and Part II. Answer all questions. Part I contains five parts and carries 20 marks. 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. This question paper contains 4 pages. Make a header box on your answer sheet with the following information. NAME: ____________________ SUBJECT:_________________ GRADE :____________________ DATE: _____________________ ______________________________________________________________________ Part: I (20 marks) Attempt all questions from this part Q1 a. i) ii) iii) iv) v) vi) 1 Answer the following questions briefly and to the point: What do you mean by pleotropism? Give one point of difference between Cellular and Helobial endosperm. How will you differentiate Exons and introns? Write any one example for Amensalism. What is co-extinction? Write the causative organism of Typhoid. November/2020-21/PB- 1/Gr. 12/Biology - A [8]

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