LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & PLANT BIO-TECH.
SECOND SEMESTER – APRIL 2012
PB 2504/PB 2502/PB 2500 - PLANT DIVERSITY - II(PTERI.,GYMNO.,& PALEOBOT.)
Date : 16-04-2012
Time : 9:00 - 12:00
Dept. No.
Max. : 100 Marks
PART – A
Answer the following , each in about 50 words:
(10 x 2 = 20 marks)
1. Distinguish between Apospory and Apogamy.
2. Define Amphiphloic siphonostele.
3. Explain Heterospory with example.
4. Give any two economic importance of Pteridophytes.
5. Mention any two characters of Gnetales.
6. List any two important features of Bennettitales.
7. What is Transfusion tissue?
8. What is dwarf shoot?
9. Define fossilization.
10. What is Geological time scale?
PART - B
Answer the following, each answer not exceeding 500 words:
Draw diagrams wherever necessary:
(5 x 7 = 35 marks)
11. a) Write short notes on Eusporangium and Leptosporangium.
(OR)
b) Briefly outline the classification of Pteridophytes proposed by Reimer.
12. a) Describe the strobilus of Lycopodium.
(OR)
b) Describe the cone of Equisetum.
13. a) Give an account on general characters of Gymnosperms.
(OR)
b) Bring out the salient features of coniferales.
14. a) Explain the structure of female cone of Pinus.
(OR)
b) Describe the female strobilus of Gnetum.
15. a) Explain the different types of fossils.
(OR)
b) Write short notes on Rhynia.
PART – C
Answer any three of the following, each answer not exceeding 1200 words:
Draw diagrams wherever necessary:
(3 x 15 = 45 marks)
16. Write an account on stelar evolution in Pteridophytes.
17. Write a brief account on morphology & reproduction in Marsilea.
18. Write short notes on (i) Affinities of gymnosperms with angiosperms.
(ii) Cycadales
19. Describe the male and female cone of Cycas.
20. Write notes on (i) Lepidodendron
(ii) Williamsonia
$$$$$$$