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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI 600 034
B.Sc.DEGREE EXAMINATION -PLANT BIOLOGY AND PLANT BIOTECHNOLOGY
SECOND SEMESTER APRIL 2018
17/16UPB2MC01- PTERIDOPHYTES, GYMNOSPERMS AND PALEOBOTANY
Date: 24-04-2018 Dept. No. Max. 100 Marks
Time: 01:00-04:00
PART- A
Answer the following, each within 50 words only: (10×2=20marks)
1. What is apospory?
2. Define alternation of generations.
3. Mention the association of mycorrhizae with a fern.
4. What is a sporocarp?
5. Explain the term transitional fossils.
6. What are progymnosperms?
7. What is a corraloid root?
8. What is transfusion tissue?
9. List out the contributions of BirbalSahni.
10. Comment on coal balls.
PART- B
Answer the following, each within 500 words. Draw diagrams and flowcharts wherever necessary: (5×7=35marks)
11. Distinguish between eusporangiatae and leptosporangiatae development of
sporangium.
OR
What is heterospory and seed habit?
12. How is strobilus of Lycopodium different from that of Equisetum.
OR
Elaborate the synangium of Psilotum.
13. (a)Describe the salient features of Pteridospermales.
OR
Explain the affinity of Gnetum to Angiospermae.
14. Enlist the economic importance of Gymnosperms.
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Explain the anomalous secondary growth in Gnetum stem.
15. What is fossilization? Add a note on Geological time scale.
OR
Write notes on Williamsonia .
PART- C
Answer any three of the following, each within 1200 words. Draw diagrams and flowcharts wherever necessary: (3×15=45marks)
16. Explain the various types of stelar system seen in pteridophyta.
17. Give a comparative account on the anatomical features of the petiole of Adiantum
andMarsilea.
18. Enumerate the salient features of Gymnosperms.
19. Explain the life cycle of Pinus. Add a note on its economic importance.
20. Compare the sporophytes of Rhynia, Lepidodendron and Calamites.