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ISC Class XII Board Specimen 2023 : Biology

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ISC 12th
Indian School Certificate Examination (ISC), New Delhi

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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 is divided into four sections A, B, C and D. Answer all questions. Section A consists of one question having sub-parts of one mark each. Section B consists of seven questions of two marks each. Section C consists of seven questions of three marks each, and Section D consists of three questions of five marks each. Internal choices have been provided in one question each in Section B, Section C and Section D. The intended marks for questions or parts of questions are given in brackets [ ]. --------------------------------------------------------------------------------------------------------------------- SECTION A 20 MARKS Question 1 Answer the following questions briefly. (i) Name the type of bioreactor which provides greater surface area for oxygen transfer. [1] (ii) Name the causative agent of genital warts. [1] (iii) If a segment of double-stranded DNA has 18% thymine, calculate the percentage of cytosine in the DNA. [1] (iv) A woman has normal vision, but her father is colourblind. If she marries a colourblind man, what is the probability of her son being colourblind? [1] (v) What are Ramsar sites? [1] ---------------------------------------------------------------------------------------------------------------------ISC SPECIMEN QUESTION PAPER 2023 1

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