LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

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

FIRST SEMESTER – NOVEMBER 2010

                    PB 1505/PB 1502 /PB 1500- PLANT DIVERSITY – I (ALGOLOGY, MYCOLOGY, BRYOLOGY)

 

 

 

Date : 10-11-10                     Dept. No.                                                    Max. : 100 Marks

Time : 1:00 – 4:00

 

         PART – A(20 marks)

 

ANSWER ALL QUESTIONS:                                                                  

1. Choose the Correct Answer:                                     (5 x 1 = 5)

 

1. Agar-agar is manufactured from
2. Ectocarpus b) Polysiphonia        c) Sargassum                       d) Gelidium
3. When Filaments of Anabaena break in small pieces of two or more cells, they are called
4. Hormospores b) Hormogonia         c) Hypnospores        d) Hormocysts
5. The habit of Volvox is
6. a) Unicellular b) Filamentous         c) Thalloid                 d) Colonial
7. Fungi which obtained food from dead organic material is called
8. Parasitic b) Saprophytic                      c) Symbiotic              d) Predacious
9. The endophytic algae present in the thallus of Anthoceros is
10. a) Nostoc b) Vaucheria             c) Oscillatoria                        d) Volvox

 

1. State whether the following are True or False:           (5 X 1 = 5)

 

6. The fungus which is important in genetic studies is Rhizopus.
7. Members of Hepaticopsida are popularly known as liverworts.
8. The Zoospore of Albugo is reniform.
9. Elaters are cells with spiral thickening that help in dispersing spores.
10. The brown alga Ectocarpus contains a brown pigment called as Phycocyanin.

III. Complete the following:                                                                                                        (5 X 1 = 5)

11. Lichen which possess leaf like thalli with lobed margins are called …………………..
12. When motile gametes taking part in fusion are different in size, it is known as ………..
13. Thallus with multinucleate, aseptate condition is said to be …………………
14. The fruiting body of Polyporus is known as ……………………………………………
15. The central fertile region of capsule of Funaria is called ………………………………
16. Answer ALL, each in about 50 words:                       (5 X 1 = 5)
17. What is Protonema?
18. Write 2 lines on Heterocyst.
19. What is Budding?
20. Comment on Biofertilizers.
21. Write any 2 economic importance of Algae.

PART – B

 

Answer the following each within 500 words.

Draw diagrams or flowcharts wherever necessary.                                            (5 X 7 = 35 marks)

 

21. Explain any two life cycle patterns in algae. Substantiate your answer with schematic representation.

(OR)

Give the salient features of Chlorophycophyta.

 

22. List five salient features of Vaucheria.

(OR)

Draw and describe the sporangia of Ectocarpus.

 

23. Describe briefly any 3 sexual fruiting bodies you have studied in the fungi.

(OR)

Write short notes on:

1. Nutrition of Fungi         b) Vegetative reproductive structures in fungi.

 

24. Explain briefly the structure of thallus of Lichens.

(OR)

Explain the external and internal structures of the basidiocarp of Polyporus.

 

25. Describe the Sporophyte of

(OR)

Comment on the sex organs of Bryophytes.

 

PART – C

 

Answer any three of the following each within 1200 words.

Draw diagrams or flowcharts wherever necessary.                                         (3 X 15 = 45 marks)        

26. Write any three different kinds of a sexual reproductive methods in algae.
27. Trace the Triphasic life cycle of Polysiphonia.
28. Describe the salient features of any 3 classes in fungi.
29. Explain the life cycle of Rhizopus.
30. Compare the Sporophyte of Marchantia and Anthoceros.

 

 

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