Practise 498 real Federal Board Biology questions from 2023 to 2026. See an answer and explanation as soon as you answer.
FSC Biology is examined by the Federal Board of Intermediate and Secondary Education (FBISE) in the annual examinations, for 11th and 12th class. Tayyari Karo has real questions from 2023 to 2026, covering topics such as Variety of Life, Genetics, Coordination and Control, Reproduction and Chromosomes and DNA. Working through real papers is the fastest way to learn the paper pattern and the way questions are worded.
170 of the questions are multiple choice and marked instantly; the rest are short and long questions with a model answer. The answers are prepared by Tayyari Karo, since we could not find an official marking scheme.
These are real past-paper questions. Think of your answer first, then open the explanation.
The bicuspid and tricuspid valves of the heart close during:
Answer: B. Ventricular Systole
As the ventricles contract (ventricular systole), rising ventricular pressure forces the AV (bicuspid/tricuspid) valves shut to stop backflow into the atria.
The component of second line of defense in the following is:
Answer: A. Natural killer cell
Natural killer cells are part of innate (second-line) defense; cytotoxic T, helper T and B lymphocytes belong to the third line (specific/adaptive) defense.
Which of the following acts as cell identity markers or name tags just like the sign board of shops?
Answer: D. Glycolipids
Glycolipids on the outer surface of the plasma membrane act as cell-identity markers, allowing cells to recognise one another.
Stereoisomers are isomers that differ in their H and OH group orientation. (a) What are enantiomers? (b) Draw the structure of D- and L-glucoses.
(a) Enantiomers are pairs of stereoisomers that are non-superimposable mirror images of each other, differing in the spatial arrangement of –H and –OH around one particular carbon (the reference carbon).
(b) D-glucose: the –OH on the reference (second-last) carbon points to the right in the Fischer projection. L-glucose: the –OH on that carbon points to the left — its mirror image. (CHO–H–C–OH…CH₂OH chain, with OH on the right for D-form and on the left for L-form at C5.)
Number of questions available for each exam session.
| Session | 11th class | 12th class |
|---|---|---|
| 2026 Annual | 51 | 53 |
| 2025 1st Annual | 53 | 53 |
| 2025 2nd Annual | 53 | 53 |
| 2024 Annual | 49 | 53 |
| 2023 Annual | 40 | 40 |
Yes. Every question comes from a Federal Board (FBISE) Biology paper from 2023 to 2026, and each one shows the session it came from.
No. We could not find an official FBISE marking scheme for these papers, so the answers and explanations are written by Tayyari Karo for practice. Check anything important with your teacher or textbook.
You can start free with no signup. A small set of papers per subject is free, and Premium unlocks the full question bank.
11th and 12th class. The table below shows how many questions we have for each exam session.
