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ICSE Prelims 2017 : Biology Answers Scheme (Smt. Lilavatibai Podar High School (LPHS), Mumbai)

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Tec-094 Lilavatibai Podar High School-ISC Preliminary Exam [2016-17] Subject- Biology Std-X Q1 a. 1 membranous labyrinth. 2- tonicity. 3- gigantism /acromegaly. 4 Graafian follicle. 5- photophosphorylation. [ 1mk each] Q1 b. 1- true. 2- False , vasectomy .. 3 true Q1 c. 1- diffusion. 3- WHO 4- true. 5 False - heparin / antithrombin.[5] 2- passive / passively acquired artificial immunity. 4 biomedical waste . 5 utriculus and sacculus/vestibule [1 mk each] Q1 d. 1- antithrombin others are a part of blood clotting process. 2 ureter others are a part of the female reproductive system. 3- holocentric- others are types of chromosomes based on position of centromere. 4- prostrate gland- others are all endocrine glands. 5 glucose- others are products of light reaction. [ 1mk each] Q 1 e. 1 - blue [ 1 mk] 2- dicot [half mk] reticulate venation [ half mk] 3- to keepthe cobalt chloride papers in position/ to avoid them from getting shifted from their position./to ensure only transp is the source of moisture[1 mk] 4- The cobalt chloride paper turns pink faster on the ventral/ lower surface as compared to dorsl surface.[1] This is because there are more stomata on the ventral surface in a dicot leaf. [1] Q1f. I c and d both ii -b iii b iv b v b[ 1mk each] Q1 g - 1 first growth phase- replication second growth phase- mitosis- daughter cells are formed 2- lobules seminiferous tunules- vasa effernteria- epididymis- vas deferens. 3- photons grana- chll -water- oxygen 4- conjunctiva- cornea-aqueous humour- pupil lens. 5 bacteria- antigen lymphocytes-antibody active immunity.[ 1mk each] Q1 h 1- astigmatism A defect in which thecornea or lens become irregular [ uneven] at certain points.[1] 2-Vaccine A preparation/ suspension of dead or weakened germs used to provide active immunity against a specific disease.[1] 3- Placenta An intimate connection between the foetal membrane and the uterine wall for providing nourishment to the foetus and for disposal of wastes from foetal blood .[1] 4- Mendel s law of segregation During the formation of gametes two factors controlling a character segregate without influencing each other such that each gamete receives only on e factor for each character.[1] 5 Selective reabsorption- The second stage of urine formation in which glucose, essential salts and water required by the body are reabsorbed through the renal tubule of the nephrons.[1] Q2 a i oxygen [1] Ii- photolysis of water [1] iii- bubble count decreases [1] iv- bubble count maydecrease or stop completely.[1] v bubble count increases. [1]

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