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INDIAN FOREST SERVICE (MAINJEXAM- 2023 BJKE-B-ZOLY
ZOOLOGY
Paper - 11
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.
Neat sketches may be drawn, wherever required.
Answers must be written in ENGLISH only.
SECTION A
౧1. (a) ` Illustrate the mechanism of initiation of DNA replication and formation
of primosome in prokaryotes. 8
(0) Diagrammatically compare paracentric and pericentric inversions. 8
(૦) Distinguish between sympatric and allopatric speciation. 8
(d) Explain the inheritance pattern of an autosomal recessive congenital
disease showing a three-generation pedigree. 8
(e) Discuss the significance of cladistics in the field of taxonomy. 8
BJKE-B-ZOLY 1
Q2. (a)
(b)
(০)
૦3. (3)
(b)
(૦)
౧1. (a)
(b)
(૦)
Explain the use of minisatellite DNA in the process of DNA
fingerprinting.
Discuss the isolating mechanisms that prevent interspecific crosses.
Describe the composition of prokaryotic ribosomes and _ illustrate
sequential assemblies of 30S and 50S subunits during the formation of
translation initiation complex.
Diagrammatically describe prophase stages and differentiate between
anaphase 1 and II of meiotic cell division.
Describe the factors which are known to affect the Hardy-Weinberg
equilibrium.
Explain the genic balance theory of sex determination in Drosophila.
Illustrate fluid mosaic model of plasma membrane and explain the
mechanism of active transport through the membrane.
Distinguish between founder effect and bottleneck effect. How do these
forces affect gene frequency of a large population ?
Describe the role of multiple alleles in the inheritance of ABO blood
group system in humans.
BJKE-B-ZOLY 2
15
15
10
15
15
10
15
10
15
౧5. (3)
(b)
(০)
(0)
(e)
(b)
(૦)
౧7. (a)
(b)
(૦)
૦8. (a)
(b)
(૦)
SECTION B
Explain the physiological role of cholesterol.
Compare the mechanism of osmoregulation in terrestrial and marine
mammals with examples.
Describe the role of G protein-coupled receptors in the action of steroid
hormone.
Justify the statement with examples “Coenzymes function as second
substrate of concerned enzyme”.
Discuss paedogenesis and neoteny with examples.
Draw the structure of F,F;-ATP synthase and explain the chemiosmotic
concept of oxidative phosphorylation.
Illustrate actin myosin sliding mechanism of muscle contraction and
relaxation.
Describe different types of placenta in eutherian mammals.
Discuss the process of teratogenesis in animals.
Describe the structure of IgG and the process of generation of antibody
secreting cells.
Explain the countercurrent mechanism operating at vasa recta and its
role in urine formation.
Describe hormonal regulation of menstrual cycle.
Explain the principle and protocol of in vitro fertilization in humans.
Describe alpha helix and tertiary structure of protein.
BJKE-B-ZOLY 3
15
15
10
15
15
10
15
15
10
