CBSE 2026 Class 12 Biology Must Do Topics for Exam Day

Students appearing for the CBSE Class 12 Examination 2026 can check the CBSE 2026 Class 12 Biology Must Do Topics for Exam Day available here.

Mohith Kumar

Updated on - Jan 18, 2026 | 8:50:00 AM

Check CBSE 2026 Class 12 Biology Must Do Topics for Exam Day Here.

CBSE 2026 Class 12 Biology Must-Do Topics for Exam Day: The CBSE Class 12 board examinations for 2026 are scheduled to be held from February 17 to April 10, 2026. Likewise, the CBSE Class 12 Biology Examination 2026 will be held on March 27, 2026. The CBSE Class 12 Biology Exam Pattern for 2026 is a 100-mark exam (70 Theory + 30 Practical), focusing heavily on competency-based questions (around 30%), with a 3-hour offline paper featuring MCQs, case-based, short, and long answer types. Students appearing for the CBSE Class 12 Examination 2026 can check the CBSE 2026 Class 12 Biology Must Do Topics for Exam Day available here.

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CBSE 2026 Class 12 Biology Must-Do Topics for Exam Day

Check the CBSE Class 12 Biology Must-Do Topics for Exam Day 2026 below.

Genetics & Evolution (20 Marks):
- Molecular Basis of Inheritance: DNA replication, transcription, translation, and the Lac Operon model.
- Principles of Inheritance: Mendel’s laws, monohybrid/dihybrid crosses (Punnett squares), and chromosomal disorders like Down's syndrome.
Reproduction (16 Marks):
- Sexual Reproduction in Flowering Plants: Double fertilization, pollen-pistil interaction, and post-fertilization events.
- Human Reproduction: Gametogenesis (spermatogenesis/oogenesis), the menstrual cycle, and embryo development up to the blastocyst stage.
Biology in Human Welfare (12 Marks):
- Human Health and Diseases: Life cycle of Plasmodium (malaria), immunity (innate vs. acquired), and AIDS/Cancer.
Biotechnology (12 Marks):
- Principles and Applications: PCR (Polymerase Chain Reaction), recombinant DNA technology, and applications like Bt crops and Human Insulin.
Ecology (10 Marks):
- Ecosystem & Biodiversity: Ecological pyramids, population interactions (mutualism, parasitism), and conservation strategies.

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