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Indian Forest Services (Main)
Examination-2025 DJSM-B-ZOLY
ZOOLOGY
Paper - II
Time Allowed : Three Hours Maximum Marks : 200
Question Paper Specific Instructions
Please read each of the following instructions carefully before attempting
questions:
There are EIGHT questions in all, out of which FIVE are to be attempted.
Questions no. 1 and 5 are compulsory. Out of the remaining SIX questions, THREE are
to be attempted selecting at least ONE question from each of the two Sections A and B.
Attempts of questions shall be counted in sequential order. Unless struck off, attempt of a
question shall be counted even if attempted partly. Any page or portion of the page left
blank in the Question-cum-Answer Booklet must be clearly struck off.
All questions carry equal marks. The number of marks carried by a question/part is
indicated against it.
Answers must be written in ENGLISH only.
Neat sketches may be drawn, wherever required.
SECTION A
Ql. (a) Differentiate between active transport and passive transport. 8
(b) Explain the mechanism of sex determination in nematodes. 8
(c) Describe the various methods of fossilization in animals. 8
(d) Discuss the operative principles of International Code of Zoological
Nomenclature. 8
(e) “Mutation is a raw material for evolution.” Justify. 8
DJSM-B-ZOLY 1
Q2. (a)
(b)
(c)
Q3. (a)
(b)
(c)
Q4. (a)
(b)
(c)
What are lysosomes ? Give an illustrated account on polymorphism in
lysosomes.
Define mobile DNA elements. Explain the general structure and
mechanism of transposition of IS elements in prokaryotes.
Give an illustrated account on evolutionary history of Elephant.
Describe the assumptions and applications of Hardy-Weinberg law in
calculating gene frequency.
Define chromosomal aberrations. Describe different types of
chromosomal aberrations with suitable examples.
Differentiate between Euchromatin and Heterochromatin.
Describe the different kinds of taxonomic keys and mention their merits
and demerits.
Describe the ultrastructure and functions of Golgi Body.
How does the regulation of gene expression occur in prokaryotes ?
DJSM-B-ZOLY 2
15
15
10
15
15
10
15
15
10
Q5. (a)
(b)
(ce)
(d)
(e)
Q6. (a)
(b)
(c)
Q7. (a)
(b)
(c)
Q8. (a)
(b)
(c)
SECTION B
Differentiate between oxidation and substrate level phosphorylation.
Explain the hormonal regulation of amphibian metamorphosis.
Explain the phenomenon of chloride shift for the transport of Og and
COv.
Illustrate the fate map of chick during gastrulation.
Explain the factors influencing the kinetics of primary immune
response.
Explain the applicability of laws of thermodynamics to biological
systems with suitable examples.
Define Spermatogenesis. Describe different phases of spermatogenesis
with suitable diagram.
Define morphogen. Explain the interaction between morphogen,
induction and morphogenesis during early embryonic development.
Define Apoptosis. Explain the characteristics, significance and molecular
pathways of apoptosis.
Describe the structural anatomy and functions of liver in digestion.
Discuss the basic structure and functions of Immunoglobulin.
What is the site of oxidative phosphorylation ? Describe electron
transport and oxidation-reduction potentials in energy production.
Give an illustrated account on ionic bases of nerve conduction.
Describe the interrelationship between telomere length and ageing.
DJSM-B-ZOLY 3
15
15
10
15
15
10
15
15
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