BZYCT-131 ANIMAL DIVERSITY in English Solved Assignment 2021-2022


Solved Assignment 2021-2022



Course Code: BZYCT-131
Assignment Code: BZYCT-131/TMA/2021-2022
Maximum Marks: 100

Title Name

BZYCT-131 Solved Assignment 2021-2022

University IGNOU
Service Type Solved Assignment (Soft copy/PDF)
Course BSCG
Language ENGLISH
Semester 2021-2022 Course: B.SC(G) CBCS
Session Session: July 2021- January 2022
Short Name BZYCT-131
Assignment Code BZYCT-131/TMA/2021-2022
Product Assignment of BSCG 2021-2022 (IGNOU)
Submission Date Valid from 1st July, 2021 to 30th June, 2022



Part-A Maximum Marks: 50
1. Fill in the blanks with suitable words:
a) Protists with delicate thread like pseudopodia belong to group
……………… .
b) The coelom that is formed by enlargement of the split in the mesoderm is
termed ……………… .
c) Hexactinellida are characterised by the presence of …………… spicules.
d) Ascaris lumbricoides lives as ……………… anaerobe as the availability
of oxygen is very less.
e) The different segmental appendages of various arthropods are said to be
……………… organs.
f) The cavity enclosing the gonads and the end sacs of the excretory organs
in crustaceans is the ……………… .
g) Some cephalopods have ………………. filled shells to maintain their
……………… in water.
h) The endoskeleton of most echinoderms is formed of ………………… .
i) Epitoky is a characteristic feature of ………………….. .

2. i) Describe canal system in Porifera.
ii) What do you mean by polymorphism? Explain the functions of various
polymorphic forms of Hydrozoa.
3. i) Name three important characters of Platyhelminthes for considering them
more advanced than cnidarians.
ii) What is parasitic adaptation? Explain the adaptations that have taken place
in Ascaris lumbricoides.
4. a) What are true coelomates? Discuss their advantages.
b) “Insects have dominated the terrestrial environment”. What are the reasons
for the success of the insects in the terrestrial environment?
5. a) Write brief notes on :
i) Shell in Bivalvia
ii) Crystalline style
b) Describe the water vascular system of a sea star.
Part-B Maximum Marks: 50
6. Sate whether the following statements are True (T) or False (F)
i) All lampreys are hermaphrodites.
ii) Ammocoete larvae metamorphose into adults in 3 to 7 days.
iii) The pattern of structure of limbs and girdles found in amphibians is
different from those found in higher tetrapods.
iv) Gills are used as respiratory organs in larvae of Anura and in adults of
v) Birds and crocodiles belong to a monophyletic group.
vi) In snakes, spur like rudiments of hind legs are only present in the cobras.
vii) The feather of birds consists of more than 90% of a particular type of
alpha keratin, which is protein.
viii) Most of the female birds have only the right ovary and oviduct.
ix) The newborn babies of deer and horses are precocial.
x) Cynodonts developed homodont teeth.
7. a) Name five hallmarks shared by all chordates, and explain the function of
b) Describe the common morphological features of hagfishes and lampreys.
How do they differ from each other?
8. a) Why do marine teleosts need to drink large amounts of seawater? How do
the freshwater teleosts overcome their osmoregulatory challenges?
b) Explain the mechanism of circulation in amphibians.
9. a) How are tuataras different from lizards?
b) How do crocodiles and alligators differ from each other?
c) Where was the Archaeopteryx discovered? Give reasons for the
Archaeopteryx being considered the connecting link between reptiles and
10. a) List and give one function of the four glands of the integument of
b) Give two distinguishing morphological features of each of the following
i) Cingulata
ii) Sirenia
iii) Primate


BZYCT-131, BZYCT 131, BZYCT131


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