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xii biology sample paper

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Krishna Patil
K. V. Pendharkar College, Dombivli

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PRANJAL GROUP TUITIONS XI & XII SCI. / JEE(Main) / MH-CET / AIPMT 2014-15 XII SCI: BIOLOGY - I PRELIMINARY EXAM-1 Time: 1: 30 Hrs. Max Marks: 35 Note: i. ii. iii. iv. v. vi. Answers to Section-I and Section-II should be written in Two Separate answer books. Questions from Section-I attempted in the answer book of Section-II and vice-versa will not be assessed / not given any credit. All questions are compulsory. Draw neat and labelled diagram wherever necessary. Figures to the right indicate full marks. Answer to every new question must begin on a new page. SECTION- I Q.1. Select and write the most appropriate answer from the given [7] alternatives for each sub-question. i) Removal of large pieces of floating debris, oily substances, etc. during sewage treatment is called ____. a) primary treatment c) final treatment ii) b) secondary treatment d) amplification In a Mendelian cross, 45 tall and 14 dwarf Pea plants were obtained. Genotype of parents was ______. iii) The horizontal distribution of trees is studied in _____. a) scarification b) stratification c) zonation d) speciation iv) Cloning can be done in vitro, via _____. a) Polymerase Chain Reaction c) Transposons v) b) Gel Electrophoresis d) Lambda phage DNA strand which is formed continuously in 5 3 direction is called ____. a) lagging strand c) template strand vi) b) leading strand d) Okazaki fragment Vincristin , a secondary metabolite is obtained from the plant ___. a) Catharanthus roseus c) Daucus carota vii) b) Asparagus racemosus d) Datura stramoneum In dark reaction, the first compound to accept CO2 is ______. a) RuMP Q.2. b) RuBP c) PGAL Answer in One sentence each. i) 2014-15 (A) d) PGA What is Golden rice? XI & XII SCI. / JEE (Main) / MH-CET / AIPMT [6] PRANJAL GROUP TUITIONS 1 PRANJAL GROUP TUITIONS XI & XII SCI. / JEE(Main) / MH-CET / AIPMT 2014-15 ii) Define PCR. iii) Give two examples of bacterial pathogens as herbicides. iv) What is degeneracy of genetic code? v) What are polygenes? vi) What is meant by deforestation? (B) Draw a neat and labelled diagram showing ultrastructure of [2] mitochondrion. (C) i) Define stock and scion. Write any two advantages of grafting. ii) Write a note on Rhizobia as a biofertilzer. iii) Give the importance of photosynthesis. iv) Give the significance of Kreb s cycle. (A) Attempt any Two of the following. i) Q.3. Attempt any Two of the following. [4] Define Decomposition? Explain the various steps of decomposition [6] process. ii) Explain monohybrid cross with suitable example. iii) Differentiate between cyclic and non-cyclic photophosphorylation. (B) Draw a labelled diagram showing the mechanism of DNA [3] replication. Q.4 What is the law of independent assortment? Explain with suitable example. Q.4. [7] OR Explain the process of double fertilization in angiosperm and give [7] its significance. 2014-15 XI & XII SCI. / JEE (Main) / MH-CET / AIPMT PRANJAL GROUP TUITIONS 2 PRANJAL GROUP TUITIONS XI & XII SCI. / JEE(Main) / MH-CET / AIPMT 2014-15 BIOLOGY - II (PRELIMINARY EXAM-1) Time: 1: 30 Hrs. Max Marks: 35 Note: i. ii. iii. iv. v. vi. Answers to Section-I and Section-II should be written in Two Separate answer books. Questions from Section-I attempted in the answer book of Section-II and vice-versa will not be assessed / not given any credit. All questions are compulsory. Draw neat and labelled diagram wherever necessary. Figures to the right indicate full marks. Answer to every new question must begin on a new page. SECTION- II Q.1. Select and write the most appropriate answer from the given [7] alternatives for each sub-question. i) Red data book provides data on _____. a) red flowered plants b) red coloured fishes c) endangered plants and animals ii) The common fresh water fish is ____. a) Rohu iii) d) red eyed birds b) Sardine c) Pomphret d) Prawn Which one of the following produces antibodies? a) Monocytes b) Erythrocytes c) Lymphocytes d) Thrombocytes iv) Variable number of tandem repeats (VNTRs) are analysed for ____. a) Recombinant DNA technology c) Direct gene transfer v) d) DNA fingerprinting Genetic constitution of Klinefelter s syndrome is ______. a) 44 + XXY vi) b) Gene therapy b) 44+XO c) 42+XXXX d) 44+XX Chemical transmission in synapse occurs due to ____. a) cholesterol b) ATP c) acetylcholine d) choline esterase vii) ArcheSopteryx is a proof of close, evolutionary relationship between __. a) reptiles and aves c) aves and mammals Q.2. b) reptiles and mammals d) none of these Answer in One sentence each. i) What is gout? ii) What is synapsis? iii) 2014-15 (A) Why is intraspecific competition more severe? XI & XII SCI. / JEE (Main) / MH-CET / AIPMT [6] PRANJAL GROUP TUITIONS 3 PRANJAL GROUP TUITIONS XI & XII SCI. / JEE(Main) / MH-CET / AIPMT 2014-15 iv) Which cells of the body produce insulin? v) Name the ancestor of human which is described as a man with ape brain. vi) (B) Draw a neat labelled diagram of T.S. of thyroid glands. [2] (C) Attempt any Two of the following. [4] i) What are podocyte? In which part of the nephron are they present? ii) Distinguish between X and Y Chromosome. iii) Write two major functions of each of testis and ovary. iv) Write a note on Genetic drift . (A) Attempt any Two of the following. i) What are the causes of extinction of wildlife? ii) Define gene therapy. State its objectives and examples. iii) Q.3 Name the cell which produces thrombocytes. Describe any three hormones secreted by the adrenal gland and [6] their functions. (B) Draw a neat and well labelled diagram of ventral view of human [3] heart. Q.4. Describe the phase of female reproductive cycle in human being. [7] OR Q.4. 2014-15 Explain various defence mechanisms with examples. XI & XII SCI. / JEE (Main) / MH-CET / AIPMT [7] PRANJAL GROUP TUITIONS 4

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