Class 12 CBSE Biology — Important MCQs with Answers

Practise Class 12 Biology chapter by chapter, all in one place. Every question follows the latest NCERT syllabus and the chapters your school teaches, in the same order. There are 117 timed quizzes made from 1,172 practice questions across 13 chapters. Easy builds confidence, Medium makes it stick, and Hard stretches you toward competitive-exam level in Class 11 and 12.

To score well in Class 12 Biology, focus on diagrams, key terms and knowing NCERT line by line. Each chapter on XamBaaz has timed Easy, Medium and Hard quizzes, several of each and never the same set twice. Marking is exam-style: +4 for a right answer, −1 for a wrong one, 0 for a skip, the same negative marking as NEET UG. Every question has a one-line explanation, so you learn why an answer is right, not just which option.

Start with any chapter. Popular picks include Sexual Reproduction in Flowering Plants, Human Reproduction, Reproductive Health, right through to Biodiversity and Conservation. Go chapter by chapter and watch your accuracy rise. Attempt every chapter and the Class 12 Biology Subject Mastery Test unlocks — a 30-question, 60-minute mock on the whole syllabus, set like a board paper.

Practice is free to try, with no credit card and no app to install. Sign in with Google and your progress, streaks and XP save on every device. Revise Class 12 Biology on your phone between classes and pick up where you left off.

Each chapter opens with free Key Concepts revision notes — a quick overview, the core concepts defined and key formulas — so you can revise Class 12 Biology before you practise. Open any chapter below to read its notes and try sample questions.