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

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KENDRIYA VIDYALAYA SANGATHAN CHENNAI REGION CLASS XII COMMON PRE BOARD EXAMINATION 2014-2015 Subject :Biology Time Allotted: 3 hrs Max .Marks : 70 General Instructions: (i) All questions are compulsory. (ii ) This question paper consists of four Sections A, B, C and D.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 3 marks each and a VBQ of 4 mark, Section D 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. SECTION: A 1. What does the term dioecious denote in plants? 1 2. In a dihybrid cross, when would the proportion of parental gene combinations be much higher than non-parental types as experimentally shown by Morgan? 1 3. What is biopiracy? 1 4. Name the amino acids having only one codon. 1 5. What is the role of Morphine in the patients those who have undergone surgery? 1 SECTION: B 6. IARI has released several varieties of crop plants that are biofortified .Give two examples of such crops and their biofortification. 2 7. In several species such as papaya, male and female flowers are present on different plants. What are the types of pollination prevented by this condition? 2 8. What are UTRs in mRNA? What is its role? 2 9. What is interspecific hybridization? Give an example. 2 10. Mention how e-waste is produced and disposed of.What is the solution for this problem? OR What are sacred groves? Mention the sacred groves in Rajasthan and Meghalaya. 2 SECTION: C 11. What are the advantages offered by seeds to angiosperms? 3 12. Name the three layers of tissues which form the wall of the uterus .Write its role. 3 13. A pregnant human female was advised to undergo MTP.It was diagnosed by the doctor that the fetus she is carrying has developed from a zygote formed by an XX egg fertilized by Y-carrying sperm. Why was she advised to undergo MTP? 3 Page 1 of 3

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