No. of Printed Pages : 8
CV
LSE-09
BACHELOR OF SCIENCE (B.Sc.)
Term-End Examination
December, 2011
CD
LIFE SCIENCE
LSE-09 : 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
3
given in parentheses.
(i)
In protostomes, the origin of ceoclom
is (Schizocoelous/enterocoelous)
(ii)
Copepods are (ciliary-mucous/filter)
feeders.
(iii) Ancylostoma duodenale is a hookworm
found in the intestine of (man/sheep).
(b) State whether the following statements are
3
True (T) or False (F).
(i)
Nematodes have a body cavity
between the ectoderm and endoderm
but it is not lined by mesoderm.
(ii)
Autogamy in Paramecium is a kind of
cross fertilization.
(iii)
Digenean flukes have only one host.
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(c) Give the term used for each of the following :4
(i)
The sheath usually made of gelatinous
material that encloses a number of
sperms.
(ii)
A non-directional movement whose
rate of speed depends on the intensity
of the stimulus.
(iii) The phenomenon in which eggs hatch
inside the female and the young ones
are born.
(iv) The process in which the visceral mass
undergoes a 90°-180° twist with
respect to head and foot, in pila.
(d) Fill in the blanks.
(i)
is the chief
intermediate host of wuchereria
bancrofti.
(ii)
is the locomotory
structure in Euglena.
(iii) The special comb like sense organs of
scorpions are
(iv) In the bee colony royal jelly is
produced by (v)
Prothoracic glands of insects secrete
hormone.
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5
2.
(a) Explain round and waggle dances in 5
honeybees as a means of communication.
(b) Draw a well labelled diagram of cross 5
section of a planarian through its
pharyngeal region.
3.
(a) With the help of diagram, describe the 6
water-vascular system of starfish.
(b) Draw a well labelled diagram of an enlarged4
mature proglottid of Taenia solium.
4.
(a) What are the main functions of contractile 5
vacuoles in Protozoa ? Explain your answer
by giving examples of Amoeba and
Paramecium.
(b) What is meant by open and closed types of5
blood circulation ? Explain your answer
with appropriate examples.
5.
Describe any four types of adoptive radiations seen
in Polychaeta.
10
6.
Describe the patterns of sexual reproduction in
10
Paramecium.
7.
Describe the phenomenon of insect migration. 10
8.
Describe life cycle of Bombyx rnori giving brief
account of silk production. Write the names of
any three non-mulberry silk.
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