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Class 10 CBSE Pre Board 2017 : Mathematics (Delhi Private School, Sharjah)

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PBBIOSET1AK1215 14/1/16 Pre-board (EEE Consortium) Examination 2015-16) Set-1 Biology (Answer Key) ANSWERS SN O MARKS SECTION A 1 1 2 Animals like whales, bats, cheetah and humans share similarities in the pattern of bones of forelimbs. In these animals, the same structure is developed along different directions due to adaptions to different needs. This is divergent evolution (b) Molluscs. (a) Insects 3 PD=N(Population)/S(area). Starvation and mass mortality + 4 In situation of natural or man made disturbances 1 5 6 7 - In haploids showing the haplontic life cycle gamete formation involves only mitosis whereas in diploids , the gamete formation requires meiosis SECTION B + 1 Introduction of sex education in schools is another step to disseminate *4 right information to the young minds about the reproductive organs ,accessory organs of reproduction, secondary sexual characters, adolescence and related changes ,safe and hygienic sexual practices ,STD s, birth control methods etc (any four) 1+1 (i) Vaccine safety- Transgenic mice are developed to test safety of polio vaccine before being used on humans. (ii) Human protein ( -1-antitrypsin) is used to treat emphysema. OR (a) insulin from other animal source cause allergy and other immune reaction. (b) in proinsulin C peptide joins polypeptide A and B but is processed later and isn t found in mature insulin. Page 1 of 6 1+1

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