LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & BIOTECHNOLOGY

IB 3

SECOND SEMESTER – APRIL 2006

                                         PB 2502 – PTERIDO., GYMNO., & PALEOBOTANY

(Also equivalent to PB 2500)

 

 

Date & Time : 24-04-2006/1.00-4.00 P.M.   Dept. No.                                                       Max. : 100 Marks

 

 

Part A

Answer all the questions                                                                     (20 marks)

1. Choose the correct answer (5 x 1 = 5 )
2. Which one of the following fern is commonly called as club mosses
3. a) Psilotum b) Lycopodium            c) Equisetum               d) Marsilea
4. Name the scientist who proposed telome theory.
5. a) Rimer b) Zimmermann           c) Andrew                   d) Bohlin.
6. Which of the following is used as a source of anticancer drug?
7. a) Zamia b) Taxus                      c) Cycas                      d) Tsuga
8. The ovule of Gnetum has _____ integuments.
9. a) 1 b) 2                              c) 3                              d) 4
10. Life originated in this planet about ______ billion years
11. a) 3.5 b) 4.5                           c) 1.5                           d) 5.3

 

1. State whether the following statements are True or False (5 x 1 = 5 )
2. The gametophyte of Selaginella is exosporic.
3. The leaves bearing sporangia are called elators.
4. Ginkgo biloba is a living fossil.
5. Welwitschia belongs to Coniferopsida.
6. Compression fossils are commonly seen in coal mines.

III. Complete the following                                                                 (5 x 1 = 5)

11. Adiantum belongs to the class __________.
12. In ferns, __________ phase is the dominant part of the life cycle.
13. When centripetal and centrifugal xylem are present the condition is referred to as _______________
14. Eccentric secondary growth is seen in _____________.
15. Progymnosperms were discovered by ________________.

 

 

1. Answer the following in about 50 words (5 x 1 = 5)
2. What is amphiphloic siphonostele?
3. Distinguish between heterospory and homospory.
4. Distinguish between haplochelic and syndetochelic stomata.
5. Describe the embryo of
6. What is Petrifaction?

Part B

Answer any five of the following, each in about 350 words. Draw necessary diagrams.    (5 x 8 = 40)

21. With an example, explain the life cycle of a heterosporous Pteridophyte.
22. Write notes on origin of Pteridophytes.
23. Describe the life history of Psilotum.
24. List out the characteristic features of Cordaitales.
25. Enumerate the salient features of Cycadeoideales.
26. Write notes on the anatomy of stem in Gnetum.
27. Mention the conditions essential for fossilization. Add a note on changes that occur during fossilization.
28. Describe the important features of Calamites. Compare it with

 

Part C

Answer the following questions in about 1500 words. Draw necessary diagrams

(2 x 20 = 40)

29. a. Write notes on i) Heterospory precedes seed habit. Discuss.

ii). Briefly explain the types of stele.

(or)

1. Give a comparative account of life cycle of Equisetum and Marsilea.
2. Explain in detail about the structure of male and female cone in Pinus.

(or)

1. Write in detail about the anatomy of stem and leaf in Cycas.

 

 

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