CBSE Class 12 Biology Practical Exam 2026 — Viva Questions, Experiments, File

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🔬 Practical Exam Structure (30 Marks)

Component	Marks
Experiment / Practical Work	15
Viva Voce (Oral Questions)	5
Practical File / Record	5
Project Work	5

🗣️ Common Viva Questions

Explain the principle behind your experiment
What are the sources of error in this experiment?
Why do we use this specific apparatus?
What are the precautions to take?
How would you improve the accuracy of this experiment?

💡 Pro Tip: Even if your experiment doesn't give the expected result, explain WHY in your viva. Examiners value understanding over perfect results. Practice explaining each step of your experiment out loud.

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