IB Biology SL (Standard Level) is part of the International Baccalaureate (IB) Diploma Programme. Spanning two years, this course is ideal for students interested in life sciences but who may not wish to specialize in biology at a higher level. It provides a strong foundation in key biological concepts, scientific investigation, and global environmental awareness.

What Is IB Biology SL?

IB Biology SL introduces students to essential topics in biological science through a mix of theoretical study and hands-on experimentation. It emphasizes scientific inquiry, data analysis, and understanding of biological systems and processes. The course also encourages international-mindedness by addressing global issues like climate change and public health.

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IB Biology SL Course Structure

The core curriculum includes six major topics:

1. Cell Biology

• Cell structure and function
• Membrane transport
• Cell division

2. Molecular Biology

• Metabolism and enzymes
• DNA structure and replication
• Transcription and translation

3. Genetics

• Mendelian inheritance
• Gene linkage and mutations
• Genetic engineering and biotechnology

4. Ecology

• Species, communities, and ecosystems
• Energy flow in food chains
• Carbon cycling and sustainability

5. Evolution and Biodiversity

• Natural selection and speciation
• Phylogenetic classification
• Conservation of biodiversity

6. Human Physiology

• Digestive and circulatory systems
• Immune response
• Respiratory system

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Assessment Structure

IB Biology SL students are evaluated through internal and external assessments:

Internal Assessment (IA) – 20% of Final Grade

Students design and conduct an independent experiment and submit a written report (6–12 pages). This assesses their ability to apply the scientific method, analyze data, and communicate findings effectively.

External Assessments – 80% of Final Grade

• Paper 1 (20%) – 30 multiple-choice questions (45 minutes)
• Paper 2 (32%) – Data-based questions, short-answer, and extended-response (1 hour 15 minutes)
• Paper 3 (28%) – Experimental skills and one optional topic (1 hour)

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Key Features of the Course

• ✅ Inquiry-Based Learning: Focus on designing experiments and understanding the scientific method
• ✅ Real-World Relevance: Exploration of global biological issues such as climate change and disease
• ✅ Interdisciplinary Links: Integration with chemistry, physics, and mathematics
• ✅ Technology Integration: Use of scientific tools such as microscopes and data loggers

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Who Should Take IB Biology SL?

This course is ideal for students who:

• Want a solid foundation in biology without specializing
• Plan to keep their university and career options open
• Have a general interest in life sciences but prefer a less intensive study than HL

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IB Biology SL vs HL: What’s the Difference?

Feature	SL	HL
Teaching Hours	150 hours	240 hours
Depth of Content	Standard	In-depth
Optional Topics	1 topic	2 topics
Exam Difficulty	Lower	Higher

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Final Thoughts

IB Biology SL is a well-rounded and accessible course that helps students develop scientific literacy, critical thinking, and an appreciation for the biological world. Whether you’re preparing for university studies in health, environmental science, or simply want to explore life sciences, this course offers valuable knowledge and transferable skills.

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Note: Course details may vary. Please refer to the official IB website for the most updated syllabus: www.ibo.org

First draft generated by AI. Edited by Professor Chan Kwok Wai. Chief Editor: Kong Yi Leung.