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:
01. The Principal pigment of cyanophyta is:
a) Phycoerythrin
b) Phycocyanin c) Fucoxanthin
d) Chlorophyll
02. When the ascocarp is a completely closed structure, it is called
a) Perithecuium
b) apothecium c) Parathecium
d) Cleistothecium
03. Which of the following is involved with spore dispersal in mosses.
a) Operculum
b) apophysis
c) elaters
d) seta
04. The stem and petiole of pteridophytes are covered with numerous
brownish scale like structures called
a) Root hairs
b) Hairs
c) Ramenta
d) scales
05. Ovules are not found enclosed in ovary of
a) Algae and fungi b) Bryophyta
II State true or false
c) Gymnosperms
d) Angiosperms
(5  1 = 5 Marks)
06. Free floating, microscopic algae are referred as phytoplanktons.
07. Fungi are autotrophic in their mode of nutrition.
08. In bryophytes, the sporophyte is independent of the gametophyte.
09. Lycopodium species are commonly known as horse tail.
10. Vegetative reproduction in Cycas is by means of bulbils.
(5  1 = 5 Marks)
III Complete the following
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.
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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
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 needle.
PART  C
(2  20 = 40 Marks)
Answer the following, Each with in 1500 words. Draw necessary diagrams. Necessary
diagrams.
29. a) Explain the following.
i) Habitats of algae ii) ascocarps in fungi iii) sex organs of bryophytes.
b) Write short notes on
i) pigments and cell wall composition in any five algal divisions
ii) asexual spores in fungi iii) adaptations in bryophytes
30. a) Explain the following
i)
types of protosteles in pteridophytes
ii)
Sexual reproduction in pteridophytes
iii)
Altered and unaltered fossils
(OR)
b) Write notes on
i)
External features of Gnetum
ii)
Reproductive features of Gymnosperms
iii)
Economic importance of Gymnosperms.
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