The CSS Zoology Paper 2026 is an optional paper that tests a candidate’s understanding of animal biology from molecular mechanisms to ecosystem-level interactions. The paper reflects a balanced mix of fundamental concepts and applied knowledge, covering areas such as cell biology, genetics, physiology, evolution, taxonomy, and environmental adaptations.
It evaluates not only factual command but also conceptual clarity, diagrammatic explanation, and the ability to relate zoological principles to real-world issues like biodiversity loss, climate change, and disease dynamics. Overall, the paper demands scientific precision, structured answers, and strong analytical thinking to secure high marks.
CSS Zoology Past Paper 2026
Q2. Discuss transcription and translation in eukaryotic cells and explain how they represent the central dogma of molecular biology.
Q3. Elaborate homeostasis in animals with emphasis on kidney function and osmoregulatory mechanisms.
Q4. Describe the major classes of biomolecules and discuss their role in maintaining the structural and functional integrity of animal cells. Also, describe which one of these biomolecules is most important in your opinion.
Q5. What is metamerism in Annelids? Explain its evolutionary and ecological implications.
Q6. Discuss major characteristics of reptiles and explain adaptations that enabled them to become successful terrestrial vertebrates.
Q7. Discuss hormonal coordination in vertebrates, detailing hormone types and mechanisms of hormone action.
Q8. Write short notes on any TWO of the following:
- (a) Amphibians
- (b) Smog – past, present, and challenges
- (c) Parasitic Adaptations in Platyhelminthes
View the CSS Zoology Past Paper 2026
