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ISC Prelims 2016 : Biology (Sri Sri Academy (SSA), Kolkata)

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Sumit Roy
Sri Sri Academy (SSA), Kolkata
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SRI SRI ACADEMY CLASS XI (BIOLOGY) 1ST TERMINAL EXAMINATION SESSION 2015-2016 Time: 3 Hours 1. 2. 3. 4 Subject: - Biology Class: - XI Max Marks - 70 GENERAL INSTRUCTIONS: Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time Answer all questions in part - I and six questions in part - II; choosing two questions from each of the three sections:- Section A , Section B and Section C. All working including rough work; should be done on the same sheet as on adjacent to the rest of answer. The intended marks for questions or parts questions are given in brackets ( ) Part I (20 Marks) Answer all questions Question 1 (a) Give a brief answer for each of the following:(4) (i) What are Zwitterions? (ii) Why blood does not clot within the blood vessels? (iii) Name the causative agent of the disease Kala- Azar. (iv) Name the protein which is contained in Noctiluca that helps in bioluminescence. (b) State the significant differences between the following:(i) Haemoglobin and Leg Haemoglobin. (ii) Neurogenic Heart and Myogenic Heart. (iii) Nucleoside and Nucleotide. (iv) Mycorrhiza and Lichens. (4) (c) Rewrite the correct answer from the given alternatives: (i) The yellowing of the leaves is caused by the deficiency of:(A) Sodium (B) Potassium (C) Magnesium (D) Phosphorous (ii) Mature mammalian RBC does not have (4) P.T.O

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(A) Nucleus (C) Both A and B (iii) (iv) (B) Mitochondria (D) None of the above The space in the trachea, bronchi and other air passage which contains air that does not reach in alveoli (A) Residual Volume (B) Dead Air space (C) Vital capacity (D) Functional Residual capacity Mesosomes are present in:(A) Gram positive bacteria (B) Viruses (C) Fungi (D) Gram negative bacteria (d) Give a scientific term for each of the following: (4) (i) The viruses where RNA acts as genetic material. (ii) The amount of blood pumped by the heart into the aorta in one minute. (iii) The common cyclical ring present in all steroid molecules. (iv) The soilless culture where the large scale cultivation of plants in done in water. (e) State the most significant contribution of the following scientists: (i) Ronald Ross (ii) Iwanowsky. (iii) Dr Scipone Riva Rocci (iv) Christian Gram (2) (f) Expand the following: (i) DHAP (ii) PUFA (iii) LSD (iv) EDTA (2) P.T.O. Part II (50 Marks) Section A (10 Marks)

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Answer any two questions. Question 2 (a) Discuss the basic criteria of Whittaker s five kingdom classification. (b) Define Viriods (c) Name one beneficial fungus and one harmful fungus. Question 3 (a) Name the three types of archaebacteria and write about their occurrence. (b) State two differences between Bacteria and Fungi from the perspective of Cell wall composition and pigment present. (c) State one living and one non living characteristics of the Biologist Puzzle Question 4 a State two important chararctestic features each of Zooflagellata and Rhizopoda by giving one example in each case. b Name the classes of Fungi which are being categorized on the basis of spores. c What are Prions? Name a disease in humans which is affected by Prions. (3) (1) (1) (3) (1) (1) (2) (2) (1) Section B (20 Marks) Answer any two questions. Question 5 (a) Describe the histological structure of an artery and a vein. Explain how their structure helps in their functioning? (4) (b) Explain with the help of diagrammatic approach how do erythrocytes maintains electrostatic neutrality? (3) (c) What are the conditions necessary for fixation of atmospheric nitrogen by Rhizobium? What is their role in nitrogen fixation? (3) Question 6 (a) Explain the origin and conduction of heart beat in humans. (b) Explain the cause and symptoms of each of the following: (i) Emphysema (ii) Angina pectoris (iii) Bronchial asthma. (c) State the general functions of mineral elements in plant nutrition. (4) (3) (3) P.T.O. Question 7

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(a) (b) (c) State what will happen along with proper explanation in the following cases:(i) The person is continuously supplied with pure oxygen. (ii) Blood clots in the coronary artery. (ii) Plants are supplied with low amount of nitrogen Briefly describe the stages of blood coagulation by enlisting the necessary factors Write short notes on the following:(i) Donnan s Equilibrium. (ii) Erythroblastosis foetalis. (iii) Vital capacity. (3) (4) (3) Section C (20 Marks) Answer any two question. Question 8 (a) What are Enzymes? Discuss briefly the classification of enzymes according to IUB system giving classical examples of each class. (b) Explain the structure of DNA proposed by Watson and Crick (c) State the significant differences between the following:(i) Homoploysaccharides and Heteropolysaccharides. (ii) Apoenzyme and Coenzyme. (iii) Reducing sugars and Non reducing sugars. (4) (3) (3) Question 9 (a) Give a schematic representation of Tricarboxylic acid Cycle by listing the enzymes in each step. (4) (b) Prepare a balance sheet to account for the ATP gain from the complete oxidation of one molecule of glucose during cellular respiration. (4) (c) Draw a neat labeled diagram of the simplest amino acid. Name two sulphur containing amino acid. (2) Question 10 (a) With the help of a neat labeled diagram explain the Fluid mosaic model of Plasma Membrane. (b) Explain briefly the three important factors which influence enzymatic activity (c) Write short notes on the following: (i) Antiport pathway of facilitated diffusion. (ii) Isoelectric point. (iii) Chargaff s Rule. (4) (3) (3)

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