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IldDlml6 Ettroltrh.d; 6D lnLmi6a t9tl r= f,i' , EDuc^rloxlJExcErLENcE SECOND PRE,LIMINARY EXAMINATI ON 2023AO2 4 BIOLOGY STD: X SCIENCE TIME:2 hrs. - Paper 3 DATE:09.01.2024 MARKS:80 Answers to this paper must be written on the paper provided separately. You will not be allowed to write durtngfirsi lS minutei. This time is to be spent in readtng the question papen The time given at the head af this paper is the time allowedfa) writing the answers. Attempt all questionsfram SectionA and anyfour questionsfrom Section B. The intended marlcsfor questions or ports of questiois are given in braclcets [J. This paper consists of sir printed pages. Nothing should be writt-en on this question poper. SECTION A (Attempt all questions from this section.) Question I choose the correct answers to the questions from the given options. **(Do not copy the questioR, write the correct answers only.) (i) [1st Apair of corresponding chromosomes of the same shape, alleles and size derived one from each parent is called (a) Homologouschromosome (b) Homozygouschromosome (c) Heterozygouschromosome (d) Sex chromosome (ii) The extinct human ancestor who ate only fruits and hunted with stone weapons (a) Ramapithecus (b) Australopithecus (c) Dryopithecus (d) Homo erectus are: (iii) Angina pectoris is due to (a) defectivenutrition O) defective functioning of mitral valve (c) infection by a virus (d) chest pain due to inadequate supply of oxygen to the heart muscle Conttnued onpg 2
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