CBSE Class 12 Biology Weightage 2025

The theory and practical segments of CBSE Class 12 Biology exams are evaluated separately, with respective weights of 70 and 30 marks.

The theory portion of the exam consists of 5 units, covering a wide range of topics from reproduction to biotechnology.

This unit examines sexual reproduction in flowering plants, human reproduction and reproductive health. It aims to provide a comprehensive understanding of these essential biological processes.

This unit delves into the principles of inheritance, variation, molecular basis of inheritance and the theory of evolution. These concepts form the foundation of modern genetics.

This unit focuses on human health and diseases caused by various pathogens and parasites, and also explores how microbes contribute to human welfare. It highlights the importance of preventive measures.

This unit encompasses the principles of biotechnology, its various applications including genetic engineering and its impact on agriculture, medicine and industry.

This unit examines the complex relationships within ecosystems, focusing on the dynamics of populations, interactions between species, and environmental issues like biodiversity and conservation.

The practical section assesses students on their ability to perform experimental procedures, analyze data and comprehend biological concepts through hands-on activities.

The practical assessment for Class 12 Biology in 2025 involves a variety of activities, including experiments, slide preparation, spotting, practical record and project work.

The practical component of the Class 12 Biology exam in 2025 is worth 30 marks, with a balanced distribution across different practical activities.

Visually impaired students will have a tailored practical assessment for Class 12 Biology in 2025. They will be assessed on their familiarity with the apparatus used, their knowledge of practicals through a written test, practical records, and a viva voce.

This assessment includes tasks like identifying apparatus, performing experiments virtually or with alternative methods, and demonstrating knowledge through a written test, practical records, and verbal communication.

The CBSE provides a comprehensive breakdown of the weightage for each subject in Class 12. This information allows students and educators to understand the importance of each topic and allocate study time effectively.