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ISC Class XII Board Exam 2021 : Biology

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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 TWO PARTS Part I and Part II. Answer all questions. Part I contains one question of 20 marks having four subparts. Part II consists of Sections A, B and 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) Give a significant point of difference between Oestrous and Menstrual cycle. (ii) Give the biological name of the organism causing typhoid. (iii) If the haploid number of chromosomes in a plant species is 20, how many chromosomes will be present in the cells of the shoot tip? (iv) Name a plant which flowers every twelve years. (v) Name the diagnostic test for AIDS. (vi) Name the terminal stage of ageing in the life cycle of plants. (vii) Which organisms constitute the last trophic level? [8 1] (viii) What is emasculation? ------------------------------------------------------------------------------------------------------------------This Paper consists of 5 printed pages and 1 blank page. 1218-863A Copyright reserved. Turn over

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