CSS Zoology Syllabus 2026 & 2027

CSS Zoology Syllabus is a 100-mark optional paper under Group V of the CSS optional subjects — Natural Sciences and Literature — sitting alongside Botany, Agriculture and Forestry, Environmental Sciences, Urdu Literature, English Literature, and Gender Studies. FPSC sets the CSS Zoology syllabus to cover animal diversity in invertebrates and chordates, principles of animal life, and animal form and function — the full undergraduate scope compressed into one paper. CSS aspirants with a zoology degree select this subject for its alignment with their academic background, though scoring well requires strong command across the entire topic range FPSC tests. Review the CSS optional subjects syllabus for combination rules and group requirements before confirming Zoology as your optional subject choice.

ZOOLOGY CSS Syllabus (100 MARKS)

I. Animal Diversity-Invertebrates  Architectural pattern of an animal, Taxonomy and phylogeny, Major subdivisions of animal kingdom.  Animal-Like Protists: The Protozoa: evolutionary perspective, locomotion and reproduction, Protozoa of veterinary and medical importance.  Porifera: Body wall, skeleton and water currents system. Coelenterates: Reproduction plan and alteration of generation (Polymorphism), Coral reefs.  Platyhelminthes and Nematodes: Parasitic adaptations and medical importance. Annelids: Metamerism and ecological importance.  Molluscs: Modification of foot, Feeding and their role in the shell fishery.  Arthropods: Modification in their mouth parts, Role of arthropods as vectors in the transmission in microbial infection. Arthropods and their ecological importance.  Echinoderms: Characteristics, Evolutionary perspective, Relationships to other animals; echinoderm characteristics.

II. Animal Diversity-Chordata  Hemichordates and Invertebrate Chordates: Evolutionary Perspective: Phylogenetic Relationships and considerations.  Fishes: Structural and functional adaptations of fishes.  Amphibians: Movement onto land and early evolution of terrestrial vertebrates.  Reptiles: Characteristics of reptiles, adaptations in reptilians.  Birds: Migration and navigation, adaptations.  Mammals: Structural and functional adaptations of mammals.

III. Principles of Animal Life  The chemical basis of animal life: Brief introduction to bio-molecules; carbohydrates, lipids, proteins and nucleic acids.  Cell concept and cell theory, Organization of cellular organelle (their structure and functions), Central dogma of cell biology (Transcription and Translation), Meiosis and Mitosis  Protozoa: Reproduction pattern in protozoan, Parasitism in protozoan  Mesozoza and Parazoa: Porifera: Cells types, body wall and skeleton and water currents system, Coelenterata: Reproduction plan and alteration of generation (Polymorphism)  Tissues Types: epithelial, connective, muscle and nervous tissues; organs and organ systems.  Enzymes function and factors affecting their activity, cofactors and coenzymes. Energy Harvesting: Aerobic and anaerobic respiration the major source of ATP.

IV. Animal Form and Function  Protection, support and movement: Integumentary system of invertebrates and vertebrates, animal muscles; non-muscular movement, the hydrostatic skeleton, skeletal systems of vertebrates.  Communication I: Nerves. Neurons: Functional unit of the nervous system. Reflex arc. Functional organization of the human nervous system.  Communication II: Sense organs. General properties of sensory receptors. General organization of mammalian nervous system. Autonomic nervous system.  Nutrition and Digestion: Modes of nutrition in animals. Diversity in invertebrate and vertebrate digestive systems.  Temperature and body fluid regulation: Homeostasis, temperature regulation in animals, osmoregulation, excretion and osmoregulation in different animals.  Reproduction and Development: A generalized life cycle of animals, gamete production, fertilization and development.  Chemical coordination: Endocrine system of vertebrates.

V. Animal Behavior  Behavioral Ecology: Introduction to the behavior, orientation, biological rhythms, behavioral ecology.  Ethology: Fixed action pattern, sign stimuli, instinct and learning, imprinting, habituation, conditioning, communication and social organization in animals.

VI. Evolution  Theories of organic evolution including Lamarckism, Darwinism and modern synthesis.  Hardy-Weinberg theorem and factors affecting gene frequency.  Macro-evolution including speciation, allopatric and sympatric speciation, adaptive radiation, convergent and divergent evolution.

VII. Zoogeography and Paleontology  Zoogeographic regions of the world.  Distribution of animals in the past (fossil records), geological time scale, origin of vertebrates.

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