Rr312304-plant Bio Technology

RR

Code No: RR312304 III B.Tech I Semester(RR) Supplementary Examinations, May 2009 PLANT BIO TECHNOLOGY (Bio-Technology)

Time: 3 hours

Max Marks: 80 Answer any FIVE questions All questions carry equal marks ?????

1. What is somaclonal variation? How can it be induced? Discuss the potential of this source of variation in crop improvement? 2. Explain the current status of nitrogen fixation in the field of biotechnology? 3. Write about general characteristic features of plant viral vectors? 4. Write an account on transposons and their role in transgenic plants. 5. Describe in detail Agrobacterium mediated gene transfer in plants. 6. Write in detail how herbicide resistant plants can be produced for triazines and phosphinothricine. 7. Discuss how plants can be used as bioreactors for the production of foreign proteins. 8. Discuss how overproduction of petunia chalcone isomerase in tomato results in fruit with increased levels of flavanols. ?????