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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI 600 034 B.Sc.DEGREE EXAMINATION PLANT BIOLOGY AND PLANT BIOTECHNOLOGY SECONDSEMESTER APRIL 2017
16UPB2MC01- PTERIDOPHYTES, GYMNOSPERMS AND PALEOBOTANY
Date: 22-04-2017 Dept. No. Max. 100 Marks
01:00-04:00 PART A (10 x 2=20 marks) Answer the following, each within 50 words.
1. What is amphiphloicsiphonostele?
2. Define Leptosporangium.
3. What is a strobilus?
4. State any two economic importance of Pteridophytes.
5. Mention the features of manoxylic wood.
6. What are pro-gymnosperms?
7. What is transfusion tissue? Mention its function.
8. What is polyembryony?
9. Mention any four techniques to study fossils.
10. Define geological time scale.
PART B x 7=35 marks) Answer the following, each within 500 words. Draw diagrams and flow charts wherever necessary.
11. a. Outline the classification of Pteridophytes according to Reimer (1954).
b. Trace out the life cycle of a heterosporousPteridophyte.
12. a. Describe the strobili of Equisetum.
b. Explain the sporophyte of Adiantum.
13. a. List out the salient features of Bennettitales.
b. Give an account on the general characteristics of Gnetales
14. a. Write a short note on the megasporophyll of Cycas.
b. Describe the male cone of Pinus.
15. a. Write notes on changes occurred during fossilization.
b. Give a brief account on Lepidodendron.
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PART C x 15=45 marks) Answer any three of the following, each within 1200 words. Draw diagrams and flow charts wherever necessary.
16) Elaborate on the stelar system in Pteridophytes according to the evolutionary sequence.
17) Explain the life cycle of Lycopodium..
18) According to Sporne how are gymnosperms classified?
19) Compare and contrast the L.S of ovule of Cycasand Gnetum.
20) Write detailed account on different types of fossils.