CBSE Class XI Biotechnology sample paper2008

http://www.cbseguess.com/-------------------------------------------------------------------------------------------------------www.cbseguess.com Other Educational Portals www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com Sample Paper – 2008 Class – XI Subject – Biotechnology Max. Marks:70 Duration: 3 hours General Instructions : (i) All questions are compulsory. (ii) Question numbers 1 to 5 are very short answer questions, carrying 1 mark each. (iii) Question numbers 6 to 15 are short answer questions, carrying 2 marks each. (iv) Question numbers 16 to 25 are also short answer questions, carrying 3 marks each. (v) Question numbers 26 to 28 are long answer questions, carrying 5 marks each. Section A Q1. Give the genetic make up resulting into Turner‟s syndrome. What kind of mutation is it? Q2. Expand MHC. Mention its role in transplantation. Q3. Why is one required to study conjugation? Q4. Indicate any two defense mechanism in insects. Q5. Hematoxylin-eosin stain is commonly used to stain cells while studying under a light microscope. Indicate which components of the cells are stained by each. Section B Q6. Give any two methods of staining nucleic acids. Q7. How can Genome Sequencing Projects be significant? Q8. Show, diagrammatically, the steps involved in the processing of hnRNA. Q9. A researcher is interested in all the cell types of pancreas. How can he separately collect each of them? Q10. Give one example each for mitochondrial and chloroplast inheritance. Q11. Mendel had mentioned the existence of two alleles for each gene in his theories. Give one exception to it. Explain briefly with a suitable example. Q12. What is karyotype? How is it different from an ideogram? Q13. “ DNA is the genetic material responsible for transformation.” How was it proved by Avery, Mc Cleod and Mc Carty after Griffith‟s experiments? Q14. Give any two molecular mechanisms of mutations. Indicate one repair system for each. Q15. Differentiate „tumor suppressor genes‟ and „oncogenes‟. Section C Q16. What is lac operon? Why is it called an inducing type of operon? Explain with suitable diagrams. Q17. Give one application for each of the followings: i) Fluorescent microscope http://www.cbseguess.com/-------------------------------------------------------------------------------------------------------www.cbseguess.com Other Educational Portals www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com ii) Darf field microscope iii) Scanning electron microscope Q18. Hemophilia is an X-linked recessive inheritance. If 50% of the daughters are diseased, 50% of the children carrier while 50% of the sons normal. What should be the genotype of each parent .Predict the genotype of next generation if the carrier daughter marries to a normal man. Q19. Show , diagrammatically, the details of immunoglobulin structure. Q20. Differentiate Q bandings and C bandings. Q21. “All DNA molecules are made up of same four nucleotides, still the DNA extraction methods are different for each type of tissues.” Support the statement giving the DNA extraction methods from blood cells and plant tissues. Q22. Outline the prominent features of „Genetic code‟. Q23. Expand FISH. How is this technique useful in prenatal diagnosis of a genetic disease ? Q24. A microbiologist is interested in an investigation utilizing an auxotrophic strain of E.coli ( Arg -). Show all the steps undertaken by him to raise such strain using UV radiations. Q25. Highlight the main differences in genotypic and phenotypic ratios among Complete dominance, incomplete dominance and co-dominance with suitable examples. Section D Q26. Give a detailed account of “Microbial growth measurement methods”. Q27. “Plants do not produce antibodies, but they are also attacked by pathogens or face infavourable environmental conditions.” Explain how do plants cope with such adverse conditions. Q28. With the help of suitable diagrams, explain any one of the following in details „ Replication‟ „or’ „Translation‟ ************************************************************************ All the Best New Era Senior Secondary School, Nizampura, Baroda.