CLASS: B.Sc. BOTANY
12A/ 108
St. JOSEPH’S COLLEGE (AUTONOMOUS) TIRUCHIRAPPALLI – 620 002
SEMESTER EXAMINATIONS – APRIL 2012
TIME: 3 Hrs.
MAXIMUM MARKS: 100
SEM
SET
PAPER CODE
TITLE OF THE PAPER
II
2011
11UBO230204
PTERIDOPHYTES, GYMNOSPERMS AND
PALEOBOTANY
SECTION – A
Answer all the questions:
20 x 1 = 20
Choose the correct answer:
1.
2.
3.
4.
5.
Presence of air cavities in the stem of Equisetum indicate
a)
Xerophytic feature
b)
hydrophytic featire
c)
Mesophytic feature
d)
halophytic feature
Horse tail is
a)
Selaginella
b)
Equisetum
c)
Adiantum
d)
Lycopodium
Gymnosperms are
a)
fruit bearing seed plant
b)
flowering plant
c)
seed bearing plants
d)
none of these
The pollination in cycas take place through
a)
ant
b)
water
c)
bat
d)
wind
Palaeobotany is a branch of botany which deals with
a)
living plants
b)
Fossil plants
c)
Flowering plants
d)
all of the above
Fill in the blanks:
6.
The condition of the production of two kinds of dissimilar, spores, differing in shape and size
in the same species, is termed as _____.
7.
Mixed protostele is found in _____.
8.
In Gymnosperms Xylem lacks _____.
9.
Coralloid roots are found in _____.
10.
Age of fossils is determined by _____ technique.
State True or False:
11.
Pteridophytes are also known as vascular cryptogams.
12.
Marsilea are heterosporous acquatic ferns.
13.
Resins and turpentine are obtained from Gymnospermous wood.
14.
Smallest sperms in the plant world are found in cycas.
15.
Fossils are remains of organisms that existed in prehistoric time.
Match the following:
16.
Heterospory
-
a) Equisetum
17.
Eustele
-
b) Palaeobotanist
18.
Gymnosperms
-
c) Selaginella
19.
Cycas
-
d) nacked seeds
20.
Prof.Birbal sahni
-
e) living fossil
SECTION – B
Answer all the questions:
21.
a.
5 x 4 = 20
What is the significance of heterospory?
OR
22.
b.
Write the characteristic features of Psilophyta.
a.
Describe the external morphology of sporophyte of Lycopodium.
OR
23.
b.
Explain the structure of Sori of Adiantum.
a.
Give an outline classification of Gymnosperms.
OR
24.
b.
Enumerate the salient features of Gnetales.
a.
Compare the ovules of cycas with Gnetum with suitable diagram.
OR
b.
Describe the morphology of Araucaria.
25.
a.
Give a short account on geological time scale.
OR
b.
Write a short note on reproduction in rhynia.
SECTION – C
Answer any FOUR questions:
4 x 15 = 60
26.
Write a detailed account on stelar evolution in Pteridophytes.
27.
What is alternation of generation? Explain it in the life-history of Equisetum.
28.
Enumerate the general characters of Gymnosperms.
29.
Give the diagrammatic representation of the life – cycle of cycas.
30.
Give an account of fossils and its types.
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