LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & PLANT BIO-TECH.

SECOND SEMESTER – APRIL 2011

PB 2504/PB 2502/PB 2500 – PLANT DIVERSITY – II (PTERI.,GYMNO.,& PALEOBOT.)

 

 

 

Date : 08-04-2011              Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART – A (20 marks)

Answer ALL the Questions

 

1. Choose the correct answer:                                     (5 x 1 = 5 marks)

 

1. Which one of the following shows leptosporangiate development
2. a) Equisetum b) Lycopodium c) Marsilea                 d) Rhynia

 

2. Maiden hair fern is
3. a) Azolla b) Marsilea                c)Psilotum              d) Adiantum

 

3. Vessels are present in
4. a) Cycas b) Gnetum c) Pinus                     d) Psilotum

 

4. Dwarf shoots of Pinus have 3 needles each on
5. a) monophylla b) P. strobus c)  P. sylvestris                      d) P. longifolia

 

5. Lepidodendron was found in which of the following period
6. a) Carboniferous b) Triasic c) Jurassic                d) Pre Cambrian

 

 

1. State whether the following statements are True or False: (5 x 1 = 5marks)

 

6. The cortical cells of Psilotum rhizome is characterised by the presence of endophytic

mycorrhiza.

7. Blue green algae are found in the cavities of Marsilea leaves.
8. Gymnosperms have naked seeds.
9. Gnetum gnemon is a woody climber.
10. Williamsonia is a fossil pteridophyte.

 

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

 

11. The formation of a sporophyte without the act of fertilization from vegetative cells of the

gametophyte is known as ______________.

12. False indusium is seen in_____________.
13. Inverted omega shaped arrangement of vascular bundles are seen in Cycas ___________.
14. Bract scale and ovuliferous scale are seen in the megasporophyll of ___________.
15. Father of Indian Paleobotany is ___________.
16. Answer the following each within 50 words.                         (5 x 1 = 5 marks)     

 

16. Write notes on synangium?
17. What is protocorm?
18. Differentiate manoxylic from pycnoxylic wood.
19. Write about Bars of Sanio.
20. Mention the two species of Rhynia.

 

                                                    PART – B                                      (5 x 7 = 35 marks)

 

Answer the following, each answer within 500 words.

Draw diagrams wherever necessary.

21. a) Discuss the general characters of Pteridophytes.

(OR)

1. b) What is heterospory? How does it lead to the formation of seed habit?

 

22. a) Describe the morphology of the sporophyte of Lycopodium.

(OR)

1. b) Explain the external structure of Marsilea

 

23. a) Enumerate the diagnostic features of Coniferales.

(OR)

1. b) Bring out the economic importance of gymnosperms.

 

24. a) Write notes on the female strobilus in Gnetum.

(OR)

1. b) Give an illustrated account of the internal structure of Pinus

 

25. a)Describe “ Calamites “.

(OR)

1. b) Comment on Geological time scale.

 

 

       PART – C                                             (3 x 15 = 45 marks)

 

Answer any THREE questions, each within 1200 words. Draw diagrams wherever necessary.

26. Describe the various types of steles found in Pteridophytes.
27. Explain the life cycle of Equisetum.
28. List out the affinities of Gymnosperms with pteridophytes and angiosperms.
29. With suitable diagram explain the T.S of coralloid root and leaflet of Cycas.
30. Write an essay on fossils and fossilization.

 

 

 

 

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