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CBSE Class 12 Pre Board 2021 : Biology - Set 1 (CBSE Gulf Sahodaya Qatar Chapter, Doha)

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Pre Board Examination, 2020-21 Subject - Biology (044) Class 12 Date: Time Allowed: 3 hours Max. Marks: 70 General Instructions: 1. 2. 3. 4. 5. 6. General Instructions: All questions are compulsory. The question paper has four sections: Section A, Section B, Section C and Section D. There are 33 questions in the question paper. 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. 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 1. Mention the pollinating agent of an inflorescence of small dull coloured flowers with (1) well exposed stamens and large feathery stigma. Give any one characteristic of pollen grains produced by such flowers. 2. Why is the enzyme cellulase needed for isolating genetic material from plant cells and (1) not from animal cells? 3. How many meiotic divisions are required to produce 100 seeds of tomato. (1) 4. Name one trait in humans which follows the same pattern of inheritance as the eye (1) colour of Drosophila. 5. An anther with malfunctioning tapetum often fails to produce viable male (1) gametophytes. Give any one reason. 6. What was the speciality of milk produced by the transgenic cow Rosie? Page 1 of 10 (1)

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