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CBSE Class 11 Pre Board 2021 : Biology - Prelim (CBSE Gulf Sahodaya Qatar Chapter, Doha)

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PREBOARD EXAMINATION 2020-21 Class: XI (CBSE) Date . Total Marks: 80 SUBJECT - BIOLOGY Time: 3 hrs. General Instructions: i. All questions are compulsory. ii. The question paper has four sections: Section A, Section B, Section C and Section D. There are 33 questions in the question paper. iii. 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. iv. 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. v. Wherever necessary, neat, and properly labeled diagrams should be drawn. SECTION-A 1. How do you testify that cofactors play a vital role in enzyme functioning? 1 2. Where is notochord found in urochordates? 1 3. Give one reasons for each of the following: a. Photosynthesis is considered to be the most important metabolic process on the earth b. Photorespiration is considered to be a wasteful process. 1 4. Name the kingdoms which include prokaryotic organisms in the three-domain classification. 1 5. Why are mitochondria called semi-autonomous organelles? 1 6. Why were bacteria, cyanobacteria and fungi included in plant kingdom, in the earlier classification systems? 1 7. Nucleotides are phosphorylated nucleosides. Justify. 1 8. Assertion: The purpose of making urine is to filter out undigested food from intestine. Reason: Kidneys filter the waste and produce urine. 1 a. Both assertion and reason are true, and the reason is the correct explanation of the assertion. b. Both assertion and reason are true, but the reason is not the correct explanation of the assertion. c. Assertion is false, but reason is true. d. Both assertion and reason are false 9. Mention two functions of the conducting part of the respiratory system. 1 Page 1 of 5

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