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xii biology sample paper- 2

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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 PRELIMINARY EXAM-2 Time: 3 Hrs. Max Marks: 70 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 alternatives [7] for each sub-question. i) The first transposons were discovered in _____. a) corn ii) b) wheat c) rice d) yeast The antibiotic chloromycetin is obtained from _____. a) Streptomyces erythreus c) Streptomyces venezuelae iii) b) Penicillium d) Streptomyces griseus Formation of seedless fruit is called as _____. a) Gymnocarpy c) Angiocarpy iv) b) Apocarpy d) Parthenocarpy How many NADPH2 molecules are required to produce one glucose molecule? a) 8 v) b) 10 c) 12 d) 14 An ability of plant cell by virtue of which it can generate whole plant under suitable conditions is called _____. a) micropropagation c) somatic hybridization vi) b) totipotency d) organogenesis In Pisum sativum which of the following traits is dominant? a) White flowers b) Green seeds c) Yellow pods d) Inflated pods vii) Pyramid of energy is always _____. a) inverted c) spindle-shaped Q.2 A) b) upright d) cup-shaped Answer in One sentence each. [6] i) Why is grafting not possible in monocots? ii) What is the genotype of a true breeding tall and true breeding dwarf pea plant? 2014-15 XI & XII SCI. / JEE (Main) / MH-CET / AIPMT PRANJAL GROUP TUITIONS 1 PRANJAL GROUP TUITIONS XI & XII SCI. / JEE (Main) / MH-CET / AIPMT 2014-15 iii) What are flocs? iv) What is polyblend? Where it is used? v) What is megasporogenesis? vi) In CAM plants, why does acid concentration increase during night? B) Sketch and label the V.S. of a typical flower. [2] C) Attempt any Two of the following. [4] i) Write down the harmful effects of global warming. ii) Give the applications of PCR. iii) Distinguish between DNA and RNA. iv) What are endospermic and non-endospermic seeds? Give two examples of each. Q.3 A) i) Attempt any Two of the following. [6] Explain the three processes involved in biogas production. Give any three advantages of biogas. ii) State and explain the law of dominance with suitable example. iii) What is operon? Explain the components of Lac operon? B) Give diagrammatic representation of cyclic photophosphorylation. [3] Explain the dihybrid cross with suitable example. Also give phenotypic and [7] Q.4 genotypic ratio of it. Q.4 OR Describe the ultrastructure of mitochondrion. Give its functions. [7] SECTION- II Q.5 Select and write the most appropriate answer from the given alternatives [7] for each sub-question. i) Ringworm is _____ disease. a) fungal ii) b) bacterial c) viral d) nematode The deposition of fatty substance in the lining of arteries is called ____. a) Arteriosclerosis c) Angina pectoris iii) b) Atherosclerosis d) Angiology The sum total of genes present in all individuals of interbreeding or Mendelian population is called ____. a) Gene frequency c) Gene flow 2014-15 b) Gene pool d) Gene mutation XI & XII SCI. / JEE (Main) / MH-CET / AIPMT PRANJAL GROUP TUITIONS 2 PRANJAL GROUP TUITIONS iv) XI & XII SCI. / JEE (Main) / MH-CET / AIPMT 2014-15 Gas released during Bhopal tragedy was ______. a) methyl isocyanate c) potassium isothiocyanate v) b) sodium isothiocyanate d) ethyl isothiocyanate Genetically-engineered human insulin is obtained by inserting the gene in _____. a) pancreatic cells c) Agrobacterium tumefaciens vi) b) E. Coli d) Drosophilla melanogaster Which of the following is also called bleeder s disease? a) Anaemia b) Thrombocytopenia c) Polycythemia d) Haemophilia vii) Multiple ovulation embryo transfer technique is used for ____. a) production of hybrids c) cross breeding Q.6 A) b) inbreeding d) outcrossing Answer in One sentence each. [6] i) What is criss-cross inheritance? ii) What is parasitism? iii) What is Rh factor? iv) What is adjuvant? v) What is interspecific hybridisation? vi) Define Gene pool. B) Draw a labelled diagram of T.S. of vein. [2] C) Attempt any Two of the following. [4] i) Give the functions of Uterus. ii) Distinguish between homologous and analogous organs. iii) What is the effect of ADH on renal tubule? iv) Name the two types of maps generated by HGP. Q.7 A) Attempt any Two of the following. [6] i) Describe the causative agent, mode of transmission and symptoms of typhoid. ii) Explain the sex determination in human beings. iii) Define endangered species. Add a note on their conservation. B) Sketch and label V.S. of Human kidney. [3] Q.8 Explain and process of oogenesis and give its significance. OR Q.8 Define reflex action and reflex arc. Describe various components of reflex arc. [7] [7] Briefly explain mechanism of reflex action. 2014-15 XI & XII SCI. / JEE (Main) / MH-CET / AIPMT PRANJAL GROUP TUITIONS 3

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