LSE-9
BACHELOR OF SCIENCE (B.Sc.)
Term-End Examination
December, 2009
C'
LIFE SCIENCE
LSE-9 : ANIMAL DIVERSITY-I
Maximum Marks : 75
Time : 3 hours
Note : Question no.1 is compulsory. Attempt any six questions
from question no. 2 to 8.
1.
(a) Choose the correct alternative from those given in parentheses :
3
(i) The kingdom Protista was proposed
by (Aristotle/Haeckel).
Spore forming protozoans belong to
phylum (Apicomplexa/Ciliophora).
(iii) The coelom of leech is filled with
(botryoidal tissue/coelomic fluid).
(b) State whether the following statements are True (T) or False (F) :
3
The sponge body is covered externally
by pinacoderum.
All molluscs are bilaterally
symmetrical animals.
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P.T.O.
Strobilation is a type of asexual
reproduction observed in some jelly
fishes and tapeworms.
(c) Give the term used for each of the following :
(iii)
The process of anticlockwise twist of
visceral mass in gastropoda.
The phenomenon wherein an
individual exists in different forms
and performs different functions.
The process of development of a larva
into adult.
The phenomenon of division of body
into a series of more or less similar
segments.
(d) Fill in the blanks :
Spicules form the endoskeleton in
The absorptive area of the oligochaete
intestine is increased by a fold of
tissues called Mulberry silk is produced by the larva
of the moth (v)
LSE-9
is the masticatory
apparatus found in certain echinoderms,
and is formed of five plates.
The sexual phase of reproduction of
Plasmodium occurs in 2
(a) What do you understand by biological communication in animals ? List two major
types of visual signals found among
invertebrates and write their advantages.
5
(b) List any five endocrine glands found in
invertebrates. Write one function of each
and the name of animal group in which
these are present.
5
(a) Write any ten characteristic features of
Phylum Nematoda.
5
(b) With the help of a flow chart depict the
phenomenon of metagenesis in Obelia.
5
(a) Describe the mechanism of ciliary-mucus
feeding in the sedentary polychaeta Sabella.
5
(b) Describe briefly the life cycle of blood fluke 5
Schistosoma Mansoni.
6.
Draw the labelled diagram of an insect wing. How do wings help insects in their flight ?
10
Briefly discuss the five-kingdom classification of organisms, giving any two salient features of each
kingdom. What are the limitations of this scheme
of classification ?
10
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P.T.O.
How do aquatic non-chordate metazoans 10
maintain the water and ionic balance in their
body ?
With the help of well-labelled diagrams, describe 10
the open and closed types of circulatory system
found in higher metazoans.
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