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CBSE XII Pre Boards 2015 : BIOLOGY with Answers (KV Kolkata)

5 pages, 35 questions, 17 questions with responses, 17 total responses,

Kendriya Vidyalaya No.1 Salt Lake
Kendriya Vidyalaya (KV) No. 1, Salt Lake

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KENDRIYA VIDYALAYA SANGATHAN-KOLKATA REGION 3rd PRE-BOARD EXAMINATION: 2014-15 SUB: BIOLOGY TIME ALLOWED: 3 HOURS M.M :70 General Instructions: (i) All questions are compulsory. (ii) This question paper consists of five Sections A, B, C, D and E. Section A contains 5 questions of one mark each, Section B is of 5 questions of two marks each, Section C is of 12 questions of three marks each. Section D is of 1 question of four marks and Section E is of 3 questions of five marks each. (iii) There is no overall choice. However, an internal choice has been provided in one question of 2 marks, one question of 3 marks and all the three questions of 5 marks weightage. A student has to attempt only one of the alternatives in such questions. (iv) Wherever necessary, the diagrams drawn should be neat and properly labelled. 1. 2. 3. 4. 5. SECTION A Cucurbita and papaya plants bear staminate and pistillate flowers. Mention the category they are put separately on the basis of type of flower they bear. 1 Which antibody is generated in allergy? 1 Define linkage. 1 Name the cells formed after meiosis I of the primary oocyte? 1 What forms the coconut water and white kernel of coconut? 1 SECTION B 6. Name two copper releasing IUDs. How do they act as contraceptive in females.? 2 7. A man had chicken pox in his childhood. He is not expected to have the same disease for the rest of his life. Explain how is it possible. 2 8. Describe any two methods of vectorless gene transfer 2 OR Why is Agrobacterium tumifaciens a good cloning vector. Explain? 9. List important defence mechanism in plants against herbivores (4 points). 2 10. Where do you expect more species diversity in tropics or in polar region. Give reason in support of your answer 2 SECTION C 11. What are the events that take place in the ovary and uterus during follicular phase of menstrual cycle? 3 12. What are Cry proteins? Name an organism that produces it. How has man exploited this protein to his benefit? 13 Differentiate between normal cells and cancer cells. 3 3 14. What are alien species? Explain with two examples how they disturb native species? 3 15. Chemical fertilizers are causing harmful environmental problems. What is the other option that can ensure fertility of soil and also protect the environment?Give examples. List two of its advantages over chemical fertilizer? 3 16. Write the Hardy Weinberg Principal. Explain stabilising selection. 3 OR Explain evolution by anthropogenic actions with a suitable example. 17. Draw the schematic structure of transcription unit & label it. 3 18. Study the figure given below and answer the question 3 i P O z y a Repressor mRNA Lac mRNA Repressor Inducer+ Inducer+ Repressor E1 E2 E3Enzymes

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Additional Info : KV Sangathan, Kolkata Region BIOLOGY Pre-Board Examination 2014-15 with Marking Scheme of Class XII PB-III BIOLOGY Question Paper
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