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CBSE Class 12 Pre Board 2021 : Biology (Kendriya Vidyalaya (KV) No 1, Armapur, Kanpur)

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PRE-BOARD Examination - 2020-21 Time 3 Hours Subject - Biology Class - XII kv1 M.M.- 70 General Instruction : 1. 2. 3. 4. 5. All questions are compulsory. This question paper has four sections : Section A, Section B, Section, Section D. There are 33 questions in the question paper. Section A has 14 questions of 1 mark each and 02 case based question. 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. 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. Wherever necessary, neat and properly labelled diagrams should be drawn. Section - A Q.1. Name the parts of the flower which the tastels of corn cob represent. 1 Q.2. Where is acrosome present in humans? Write its function. 1 Q.3. Mention the DNA sequence coding for sesine and the anticodon of. 1 Q.4. Define test cross. 1 Q.5. Name one symbiont, which serve as biofertiliser. Mention its specific role. 1 Q.6. Mention the useful as will as the harmful drug obtained from the latex of oppy plant.1 Q.7. Give the roles of immune system. 1 Q.8. What do you mean by polindromic sequence? 1 Q.9. Which of the three forests - Temperate, Mangroves and Tropical Evergreen is more vulnerable to in vasion by outside animals and plants? 1 Q.10. Mention any two events that are inhibited by the intake of oral contraceptives pills to prevent pregnancy in humans. Direction (Q. No. - 11 - 14) In each of the following questions, a statement of Assertion (A) is given followed by corresponding statement of reason (R) of the statements, mark the correct answers : (a) If both A and R are true and R is the correct explanation of A. (b) If both A and R are true, but R is not the correct explanation of A. (c) If A is true, but R is false. (d) If both A and R are false. Q.11. Assertion (A) the predominant site for control of gene expression in prokaryotes is transcription initiation. Reason (R) The activity of RNA polymerase is regulated by accessory proteins. Which affect recognisation of start sites. Q.12. Assertion (A) The female external genitala include monspubis, balia majora and labia minora. XII - Biology (1) P.T.O.

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