Loyola college (autonomous), chennai – 600 034

b.sc. degree examination – plant biology and bitechnology

first semester – april 2003

PB  1500/  pbB  500  plant  diVeRsitY -i

05.04.2003                                                                             Max.:   100 Marks

1.00 – 4.00

 

PART – A                                        (5 ´ 1 = 5 Marks)

I Choose the correct answer:

1. The Principal pigment of cyanophyta is:
2. a) Phycoerythrin b) Phycocyanin   c)  Fucoxanthin         d) Chlorophyll
3. When the ascocarp is a completely closed structure, it is called
4. a) Perithecuium b) apothecium   c) Parathecium           d) Cleistothecium
5. Which of the following is involved with spore dispersal in mosses.
6. a) Operculum b)  apophysis      c)  elaters                   d) seta
7. The stem and petiole of pteridophytes are covered with numerous

brownish scale like structures called

1. a) Root hairs b) Hairs                c) Ramenta            d) scales
2. Ovules are not found enclosed in ovary of
3. a) Algae and fungi   b) Bryophyta         c) Gymnosperms        d) Angiosperms

II State true or false                                                                            (5 ´ 1 = 5 Marks)

6. Free floating, microscopic algae are referred as phytoplanktons.
7. Fungi are autotrophic in their mode of nutrition.
8. In bryophytes, the sporophyte is independent of the gametophyte.
9. Lycopodium species are commonly known as horse tail.
10. Vegetative reproduction in Cycas is by means of bulbils.

III   Complete the following                                                           (5 ´ 1 = 5 Marks)

11. In Rhodophyta, flagella are completely _____________.
12. The characteristic spores produced by basidiomycetes are ____________.
13. In primitive Pteridophytes, the  ___________has elongated neck with several

neck canal cells.

 

14. In ______________, the sori are formed in a sporocarp.
15. The type of embryo development in Cycas is __________.

IV   Answer the following in 2 or 3 sentences                (5 ´ 1 = 5 Marks)

16. Distinguish between colonial and filamentous algae.
17. Write down any two general features of bryophytes.
18. Define heterospory.

 

 

 

 

19. Write about the structure of protocorm.
20. Write notes on ovuliferous scale of Pinus.

PART – B                  (5 ´ 8  = 40 Marks)

Answer any FIVE questions, choosing not more than three from each section. Each  within 350 words.

                                                            Section – I 

21. Bringout the salient features of phaeophyta and chlorophyta in the form

of tabular column

22. Explain any two types of life cycle patterns seen in fungi.
23. Explain the structure of mature sporophyte of  Anthoceros .
24. Draw diagrams only:  a) Cyanophycean cell   b) Basidocarp of Polyporus
25. c) Moss plant body.

SECTION – II

25. List the characteristics of Filicophyta.
26. Distinguish between Eusporangium and Leptosporangium.
27. Draw a well labelled diagram of Cycas ovule and discuss its structure.
28. Describe the internal structure of Pinus

PART – C                             (2 ´ 20 = 40 Marks)

Answer the following, Each with in 1500 words. Draw necessary diagrams. Necessary diagrams.

29. a) Explain the following.
30. i) Habitats of algae ii) ascocarps in fungi   iii) sex organs of bryophytes.

 

1. b) Write short notes on
2. pigments and cell wall composition in any five algal divisions
3. ii) asexual spores in fungi iii) adaptations in bryophytes

 

30. a) Explain the following
31. types of protosteles in pteridophytes
32. Sexual reproduction in pteridophytes

• Altered and unaltered fossils

(OR)

1. Write notes on
2. External features of  Gnetum
3. Reproductive features of Gymnosperms

iii)         Economic importance of  Gymnosperms.

 

 

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