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CBSE Class 12 Pre Board 2019 : Biology - Prelim 1 (St Xavier's Sr. Sec. School, Delhi)

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Pre Board Examination 2019 Std. 12 03-01-2019 Set 1 BIOLOGY Max. Marks : 70 Time : 3 hrs. General Instructions: All questions are compulsory. The question paper consists of four sections A, B, C and D. Internal choice is given in all the sections. A student has to attempt only one of the alternatives in such questions. Section A contains 5 questions of 1 mark each. Section B has 7 questions of 2 marks each. Section C is of 12 questions of 3 marks each Section D has 3 questions of 5 marks each. Wherever necessary, the diagrams drawn should be neat and properly labeled. SECTION A 1. Name the organism and the mode of reproduction represented in the diagram given below. (1) (OR) Banana crop is produced by farmers without sowing of seeds. Explain how the plant is propagated? (1) 2. Which group of organisms, regulators or conformers, can show maximum functional efficiency regardless of the existing weather conditions? Why? (1) 3. Which one of the following is used in apiculture Hilsa, Apis indica, Sonalika? (1) 4. A multinational company outside India tried to sell new varieties of turmeric without proper patent rights. What is such an act referred to? (1) 5. Why is proinsulin so called? How is insulin different from it? (OR) Why is it not possible for an alien DNA to become part of a chromosome anywhere along its length and replicate normally? (1) (1) SECTION B 6. Why should a bisexual flower be emasculated and bagged prior to artificial pollination? (2) 7. Prior to industrialization, there were far more white-winged moths on trees than melanised moths in England. However, after industrialization, the distribution pattern of these two kinds of moths reversed. What does the above observation indicate? Explain giving reasons. (2) 8. A boy of ten years had chickenpox. He is not expected to have the same disease for the rest of life. Mention how it is possible. OR It was diagnosed by a specialist that the immune system of the body of a patient has been suppressed. Name the disease the patient is suffering from and its causative agent. (2) (2)

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