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Swani Vvehanand lhternational Scbool, Grade:X PRELIMINARY EXAMINATION I (2023-24) Date: 08/12/2023 BIOLOGY (SCIENCE PAPER Marks 80 Time: 2 hrs 3) Answers teo this Paper must be written on the puper provided separately: l'on will not he allowed to write during the first 15 mintes. This time is to he spent in reading the question paper:. The time gien at the head of this paper is the time allowed for writing the answers Section Ais compulsory. Atempt any four questions from Section B. The intended marks for questions or parts of questions are given in brackets | 1. SECTION A (Altempl all questions from this Section.) Question I Select the correct answvers to the questions from the given options. Do not copy the questions. |15| Which (ype of'cell division occurs in gamnetes? (1) (a) Mitosis. reductional division (b) Meiosis. reductional division (c) Mitosis. equational division (d) Meiosis. cquational division Transmission of genetic characlers from one generation to the next is known as (ii) (iii) (a) Heredity (b) Variation (c) Mutation (d) Assortment Assertion : In humans. male (or father) is responsible lor sex of the baby which is born. Reason: Y chromosomes are present in only male gametes or sperms. (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (C) A is true but R is false. (d) A is false but R is truc. S.V.I.S. 1/8 (X Biology/ Prel1m I Paper)
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