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 Dept. No. Max. : 100 Marks
Time : 9:00 – 12:00
PART – A
Answer the following , each in about 50 words: (10 x 2 = 20 marks)
- Distinguish between Apospory and Apogamy.
- Define Amphiphloic siphonostele.
- Explain Heterospory with example.
- Give any two economic importance of Pteridophytes.
- Mention any two characters of Gnetales.
- List any two important features of Bennettitales.
- What is Transfusion tissue?
- What is dwarf shoot?
- Define fossilization.
- What is Geological time scale?
PART – B
Answer the following, each answer not exceeding 500 words: (5 x 7 = 35 marks)
Draw diagrams wherever necessary:
- a) Write short notes on Eusporangium and Leptosporangium.
(OR)
- b) Briefly outline the classification of Pteridophytes proposed by Reimer.
- a) Describe the strobilus of Lycopodium.
(OR)
- b) Describe the cone of
- a) Give an account on general characters of Gymnosperms.
(OR)
- b) Bring out the salient features of coniferales.
- a) Explain the structure of female cone of Pinus.
(OR)
- b) Describe the female strobilus of
- a) Explain the different types of fossils.
(OR)
- b) Write short notes on
PART – C
Answer any three of the following, each answer not exceeding 1200 words:
Draw diagrams wherever necessary: (3 x 15 = 45 marks)
- Write an account on stelar evolution in Pteridophytes.
- Write a brief account on morphology & reproduction in Marsilea.
- Write short notes on (i) Affinities of gymnosperms with angiosperms.
(ii) Cycadales
- Describe the male and female cone of Cycas.
- Write notes on (i) Lepidodendron
(ii) Williamsonia
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