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ISC Class Prelims 2021 : Biology (Delhi Public School (DPS), Newtown, Kolkata)

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DELHI PUBLIC SCHOOL NEWTOWN SESSION 2020-21 PREBOARD (ONLINE) EXAMINATION CLASS: XII SUBJECT: BIOLOGY FULL MARKS: 50 TIME: 1HOUR 45 MINUTES Instructions: (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. Part I contains 10 questions of 1 mark each. All questions are compulsory. Part II consists of Sections A, B and C. Section A contains five questions of two marks each. All questions are compulsory. Section B contains five 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 B and in all three questions of Section C. This paper comprises of three pages. Part-I (10 MARKS) Question 1. Answer the following questions briefly and to the point: i. ii. iii. iv. v. vi. vii. viii. ix. x. [10 1] Give a significant point of difference between Oestrous and Menstrual cycle. Give the biological name of the organism causing Amoebiasis. 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? Define the following: i. Biopatent ii. Apomixis Name the diagnostic test for AIDS. Fill in the blanks: ___________________ is used to detect DNA bands under UV light on the gel after electrophoresis. Give reasons for the following: Single Cloning site is preferred in a Vector. Differentiate between: Genomic DNA and cDNA. Mention the contribution/s of the following scientists: a. Temin and Baltimore. b. Jacob, Monod and Lwoff Expand the following: a. SSBP b. VNTRs 1

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