Chem 212 -internal 2004

Universal Science College (B. Sc. Biochemistry) Third Semester 2005

Internal Examination Subject: Chem 212 (Natural Product Chemistry) Date: Feb 6, 2005

Full Marks: 100 Pass Marks: 45 Time: 3 hours

Candidates are required to give their answers in their own words as far as practicable. The figure in the margin indicates full marks. Group A (3× ×14 = 42)

Long Questions (Any three )

1. Describe climates found in Nepal along with its floral feature? 2. What are alkaloids? Draw the of structure of nicotine, atropine and strychnine 3. Name source plants and one major constituent of fourteen essential oils traded from Nepal. 4. What do you understand by “Super heated water”? What are the applications of super heated water in Natural product chemistry? Group - B (6× ×7 = 42)

Short Questions: (Any six)

1. What are the factors that govern the climate of a place? 2. What do you mean by ecosystem level biodiversity? 3. What are sesquiterpenes? Draw the structure of farnesol and nerolidol 4. What are anthocyanins? Draw structure of pelargonodin and cyanidin. 5. Commercial importance of oils Mentha genus in Nepalese trade. 6. Steroids are responsible for export of half a dozen plants from Nepal explains. 7. What is dielectric constant and its importance in purification of Natural products 8. Flash chromatography and application in Natural Product Chemistry. Group – C Write short notes on: (Any eight)

(2× ×8 = 16)

1. Genetic level diversity 2. Goals of CBD 3. Write scientific name of plants traded in remote past. 4.

–carotene; and its sources.

5. Commercial importance of anthocyanins 6. Name four plants rich in flavones. 7. Causes of death of oldest phyto-chemical industry of Nepal 8. Knowledge of chemistry can help the conservation of Daphne. 9. Taxus trade of Nepal is example “How technology gap enhances rate of poverty growth.” 10. Extraction of caffeine from tea waste. 11. Extraction of saponin from Sapindus mukorossi 12. Extraction menthol from Mentha arvensis