ias junior zoology




Zoology Syllabus Paper – I

1. Non-Chordata and Chordata:

(a)  Classification and relationship of various phyla up to subclasses: Acoelomate and Coelomate, Protostomes and Deuterostomes, Bilateria and Radiata; Status of Protista, Parazoa, Onychophora and Hemichordata; Symmetry.

(b) Protozoa:

Locomotion, nutrition, reproduction, sex; General features and life history of Paramaecium, Monocystis, Plasmodium and Leishmania.

(c) Porifera: Skeleton, canal system and reproduction.

(d) Cnidaria:

Polymorphism, defensive structures, and their mechanism; coral reefs and their formation; metagenesis; general features and life history of Obelia and Aurelia.

(e)   Platyhelminthes:

Parasitic adaptation; general features and life history of Fasciola and Taenia and their pathogenic symptoms.

(f)  Nemathelminthes:

General features, life history, a parasitic adaptation of Ascaris and Wuchereria.

(g) Annelida:

Coelom and metamerism; modes of life in polychaetes; general features and life history of Nereis, earthworm, and leach.

(h) Arthropoda:

Larval forms and parasitism in Crustacea; vision and respiration in arthropods (Prawn, cockroach, and scorpion); modification of mouth parts in insects (cockroach, mosquito, housefly, honey bee and butterfly); metamorphosis in insect and its hormonal regulation, social behavior of Apis and termites.

(i)   Mollusca:

Feeding, respiration, locomotion, general features and life history of Lamellidens, Pila and Sepia, torsion and detorsion in gastropods.

(j)  Echinodermata:

Feeding, respiration, locomotion, larval forms, general features and life history of Asterias.

(k)  Protochordata:

Origin of chordates; general features and life history of Branchiostoma and Herdmania.

(l)   Pisces: Respiration, locomotion, and migration.

(m)  Amphibia: Origin of tetrapods, parental care, paedomorphosis.

(n)  Reptilia: Origin of reptiles, skull types, the status of Sphenodon and crocodiles.

(o)  Aves: Origin of birds, flight adaptation, migration.

(p)  Mammalia:

Origin of mammals, dentition, general features of egg-laying mammals, pouched-mammals, aquatic mammals and primates, endocrine glands (pituitary, thyroid, parathyroid, adrenal, pancreas, gonads) and their interrelationships.

(q) Comparative functional anatomy of various systems of vertebrates (integument and its derivatives, endoskeleton, locomotory organs, digestive system, respiratory system, the circulatory system including heart and aortic arches, urinogenital system, brain and sense organs (eye and ear).

2. Ecology:

(a)  Biosphere: Concept of the biosphere; biomes, Biogeochemical cycles, Human-induced changes in an atmosphere including the greenhouse effect, ecological succession, biomes and ecotones, community ecology. (b)   The concept of the ecosystem; structure and function of the ecosystem, types of ecosystem, ecological succession, ecological adaptation. (c) Population; characteristics, population dynamics, population stabilization. (d)  Biodiversity and diversity conservation of natural resources. (e) Wildlife of India. (f) Remote sensing for sustainable development. (g) Environmental biodegradation, pollution and its impact on the biosphere and its prevention.

3. Ethology:

(a)   Behaviour: Sensory filtering, reponsive-ness, sign stimuli, learning and memory, instinct, habituation, conditioning, imprinting. (b)   Role of hormones in drive; role of pheromones in alarm spreading; crypsis, predator detection, predator tactics, social hierarchies in primates, social organization in insects.        (c) Orientation, navigation, homing, biological rhythms, biological clock, tidal, seasonal and circadian rhythms. (d) Methods of studying animal behaviour including sexual conflict, selfishness, kinship and altruism.

4. Economic Zoology:

(a)  Apiculture, sericulture, lac culture, carp culture, pearl culture, prawn culture, vermiculture. (b)     Major infectious and communicable diseases (malaria, filaria, tuberculosis, cholera and AIDS) their vectors, pathogens and prevention. (c)   Cattle and livestock diseases, their pathogen (helminthes) and vectors (ticks, mites, Tabanus, Stomoxys). (d) Pests of sugar cane (Pyrilla perpusiella) oil seed (Achaea janata) and rice (Sitophilus oryzae). (e)   Transgenic animals. (f) Medical biotechnology, human genetic disease and genetic counselling, gene therapy. (g) Forensic biotechnology.

5. Biostatistics:

Designing of experiments; null hypothesis; correlation, regression, distribution and measure of central tendency, chi square, student-test, F-test (one-way & two-way Ftest).

6. Instrumentation Methods:

(a)   Spectrophotometer, phase contrast and fluorescence microscopy, a radioactive tracer, ultracentrifuge, gel electrophoresis, PCR, ELISA, FISH and chromosome painting. (b)  Electron microscopy (TEM, SEM).

Zoology Syllabus Paper – II

1. Cell Biology:

(a) Structure and function of cell and its organelles (nucleus, plasma membrane, mitochondria, Golgi bodies, endoplasmic reticulum, ribosomes, and lysosomes), cell division (mitosis and meiosis), mitotic spindle and mitotic apparatus, chromosome movements, chromosome type polytene and lambrush, organization of chromatin, heterochromatin, Cell cycle regulation. (b) Nucleic acid topology, DNA motif, DNA replication, transcription, RNA processing, translation, protein foldings and transport.

2. Genetics:

(a)  The modern concept of the gene, split gene, genetic regulation, genetic code. (b)  Sex chromosomes and their evolution, sex determination in Drosophila and man. (c) Mendel’s laws of inheritance, recombination, linkage, multiple alleles, genetics of blood groups, pedigree analysis, hereditary diseases in man. (d)  Mutations and mutagenesis. (e) Recombinant DNA technology; plasmid, cosmid, artificial chromosomes as vectors, transgenic, DNA cloning and whole animal cloning (principles and methods). (f) Gene regulation and expression in prokaryotes and eukaryotes. (g)   Signal molecules, cell death, defects in signaling pathway and consequences. (h) RFLP, RAPD and AFLP and application of RFLP in DNA finger printing, ribozyme technologies, human genome project, genomics andprotomics.

3. Evolution:

(a)  Theories of origin of life. (b)   Theories of evolution; Natural selection, role of mutations in evolution, evolutionary patterns, molecular drive, mimicry, variation, isolation and speciation. (c)   Evolution of horse, elephant and man using fossil data. (d) Hardy-Weinberg Law. (e) Continental drift and distribution of animals.

4. Systematics:

Zoological nomenclature, international code, cladistics, molecular taxonomy and biodiversity.

5. Biochemistry:

(a) Structure and role of carbohydrates, fats, fatty acids and cholesterol, proteins and amino-acids, nucleic acids. Bioenergetics. b) Glycolysis and Kreb cycle, oxidation and reduction, oxidative phosphorylation, energy conservation and release, ATP cycle, cyclic AMP – its structure and role. (c)   Hormone classification (steroid and peptide hormones), biosynthesis and functions. (d) Enzymes: types and mechanisms of action. (e) Vitamins and co-enzymes. (f) Immunoglobulin and immunity.

6. Physiology (with special reference to mammals):

(a)   Composition and constituents of blood; blood groups and Rh factor in man, factors and mechanism of coagulation, iron metabolism, acid-base balance, thermo-regulation, anticoagulants. (b)  Haemoglobin: Composition, types and role in transport of oxygen and carbon dioxide. (c) Digestion and absorption: Role of salivary glands, liver, pancreas and intestinal glands. (d) Excretion: nephron and regulation of urine formation; osmo-regulation and excretory product. (e)   Muscles: Types, mechanism of contraction of skeletal muscles, effects of exercise on muscles. (f) Neuron: nerve impulse – its conduction and synaptic transmission, neurotransmitters. (g) Vision, hearing and olfaction in man. (h) Physiology of reproduction, puberty and menopause in human.

1. Developmental Biology:

(a)   Gametogenesis; spermatogenesis, the composition of semen, in vitro and in vivo capacitation of mammalian sperm, Oogenesis, totipotency; fertilization, morphogenesis and morphogen, blastogenesis, the establishment of body axes formation, fate map, gesticulation in frog and chick; genes in development in chick, homeotic genes, development of eye and heart, placenta in mammals. (b)   Cell lineage, cell-to-cell interaction, Genetic and induced teratogenesis, the role of thyroxine in control of metamorphosis in amphibia, paedogenesis and neoteny, cell death, aging. (c) Developmental genes in man, in vitro fertilization and embryo transfer, cloning. (d) Stem cells: Sources, types and their use in human welfare. (e) Biogenetic law.

Reference Books:

  1. Cell and molecular bilogy – De Robertis, C.B. Powar
  2. Comparative anatomy of vertebrate zoology – Kent
  3. Animal physiology – H.R. Singh, Vander
  4. Biochemistry – Harper, Leninger, Stryer, Rao
  5. Embryology – Balinsky, A.K. Berry, Vir Bala Rastogi
  6. Organic evolution – Veer Bala Rastogi
  7. Genetics – P.K. Gupta, Gardner, Ahluwalia, Vir Bala Rastogi
  8. Invertebrates – R.L. Kotpal, Nigam, Jordan
  9. Vertebrates – R.L. Kotpal, Nigam, Jordan and Varma
  10. Ecology – P.D. Sharma, Odum, Vir Bala Rastogi and M.S. Jayaraj, Kotpal and Bali
  11. Economic Zoology – Shukla and Upadhaya, Kotpal- Khetrapal – Aggarwal
  12. Ethology – Reena Mathur, Magazines like Science Reporter, Nature
  13. General Zoology – Storer and Usurger
  14. Physiology – H.R. Singh
  15. Evolution – Vir Bala Rastogi
  16. A Dictionary of Entomology – Leftwich



  • Zoology is purely a science subject, emerged as a scoring optional in UPSC IAS Mains and Indian Forest Service Exam as well.
  • Aspirants must be a graduate in Zoology, Medicine, Botany, Life Science,  Agriculture, Forestry etc.


  • Memorise the Syllabus.
  • Stick to limited reference books
  • Before starting preparation, go through previous year qps

Tips for Zoology Paper I

Non-chordata and chordata:

  • Classification should be done thoroughly as it’s given in Barnes’ textbook
  • Pay attention to general essays rather than type studies
  • Always correlate things from evolutionary viewpoint -Draw as many diagrams and flow charts as possible
  • Students should cover all theories.
  • In chordate description, compare the phyla phylogenetically and anatomically.
  • Comparative anatomy diagrams should be coloured.

Economic zoology:

  • The most scoring parts are Economic Zoology, Bio Stats and Bio Instrumentation.
  • Students need to focus on topics related to developments in India in Economic Zoology.

Tips for Zoology Paper II

Section A:

  • To prepare Cell Biology and Genetics, students need to follow the same advice as provided for these two topics in Botany. However, you need to correlate cellular processes with human physiology and human disease conditions.
  • In Genetics, student should also mention the possible human welfare applications.
  • Peripheral questions are generally not asked.

Section B:

Biochemistry and Physiology

  • Practical Bio-chemical pathway with structural formula of molecules are important.
  • Prepare from medical bio-chemistry and physiology books.
  • Represent most information through flow charts.
  • Always draw relevant anatomical diagrams.

Development Biology

  • If physiology and biochemistry are prepared thoroughly, then this part can be prepared only for short notes.
  • Colored drawings are a must. Students need to practice them properly.

Previous Year Question Papers:


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