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CBSE Class 12 Pre Board 2021 : Biology (Kendriya Vidyalaya (KV), Lucknow Region)

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KENDRIYA VIDYALAYA SANGATHAN, LUCKNOW REGION SECOND PRE-BOARD EXAMINATION 2020-21 Class: XII BIOLOGY (044) Theory Time: 3 Hours Maximum Marks: 70 General Instructions:(i) All questions are compulsory. (ii) The question paper has four sections: Section A, Section B, Section C and Section D. There are 33 questions in the question paper. (iii) Section A has 14 questions of 1 mark each and 02 case-based questions of 4 Marks each. Section B has 9 questions of 2 marks each. Section C has 5 questions of 3 marks each and Section D has 3 questions of 5 marks each. (iv) There is no overall choice. However, internal choices have been provided in some questions. A student has to attempt only one of the alternatives in such questions. (v) Wherever necessary, neat and properly labelled diagrams should be drawn. SECTION A (Q1 to Q14 =1 MARK EACH) 1. Why cattle do not browse on Calotropis ? OR A pond has 400 frogs, 40 more were born in a year. Calculate the birth rate of the population. 2. How is repetitive/satellite DNA separated from bulk genomic DNA for various genetic experiments? 3. How does pollination take place in maize and water lily? OR Mention the function of tassels of corn cob. 4. Calculate the length of the DNA of bacteriophage lambda that has 48502 base pairs. 5. A Snapdragon plant with violet flowers was crossed with another such plant with white flowers. The F1 progeny obtained had pink flowers. Explain, in brief, the inheritance pattern seen in offspring s of F1 generation? 6. Differentiate between monocistronic transcription unit and polycistronic transcription unit. OR Write the central dogma of molecular biology. 7. Predict the effect if, the codon AUG coding for an amino acid Methionine at the 1st position of Apeptide chain of insulin, is mutated to AAG. 8. State a method of cellular defence which works in all eukaryotic organisms. 9. What causes the swelling of the lower limbs in patient suffering from Filariasis?

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