CSS Zoology Past Papers 2016–2026: PDF Download
Zoology carries 100 marks in CSS, including 20 marks for MCQs and 80 for written answers. There’s a lot more to the Zoology syllabus than learning the names of animals. Students have to study the structure and classification of different animal groups, along with cell division, inheritance, reproduction, and ecology. Some questions call for labelled diagrams, while others need a proper explanation of how a biological process works. The CSS Zoology past papers issued by FPSC between 2016 and 2026 are listed below.
CSS Zoology Past Paper Trends
The 2025 paper had a fairly detailed question on the thyroid gland. Students had to explain how thyroid hormones are produced and what happens when the gland becomes overactive or underactive. Hormones were also examined in 2024, particularly the hypothalamus and pineal gland. The 2026 paper approached the subject more broadly through hormonal coordination in vertebrates. Outside these questions, there’s quite a mix. One question in 2024 concerned the effects of ocean acidification on molluscs. Bird migration and navigation came up in 2025, while the 2026 paper included metamerism in annelids and the adaptations that allowed reptiles to live on land.