IGCSEBiologyEdexcelBiology (Modular)Unit 1Revision Notes

Edexcel IGCSE Biology (Modular): Unit 1
Revision Notes

Exam code: 4XBI1

Concise resources for the Edexcel IGCSE Biology (Modular): Unit 1 course.

1. The Nature & Variety of Living Organisms

Characteristics of Living Organisms

Common Features: Eukaryotic Organisms

Common Features: Prokaryotic Organisms

2. Structure & Functions in Living Organisms: Part 1

Levels of Organisation

Cell Structures

Animal & Plant Cells: Similarities & Differences

Importance of Cell Differentiation

Stem Cells in Medicine: Advantages & Disadvantages

Structure of Biological Molecules

Practical: Food Tests

Role of Enzymes

Temperature & Enzyme Function

Practical: Investigating Temperature & Enzyme Activity

pH & Enzyme Function

Practical: Investigating pH & Enzyme Activity

Diffusion, Osmosis & Active Transport

Factors Affecting the Rate of Movement of Substances

Practical: Investigating Diffusion & Osmosis

The Process of Photosynthesis

Factors Affecting the Rate of Photosynthesis

Leaf: Structure & Adaptations

Plants & Mineral Ions

Practical: Investigating Photosynthesis

Human Alimentary Canal: Structure & Function

Role of Digestive Enzymes

Small Intestine: Structure & Adaptations

Practical: Energy Content of a Food Sample

Process of Respiration

Aerobic & Anaerobic Respiration

Practical: Investigating Respiration

Gas Exchange in Plants

Leaf Adaptations for Gas Exchange

Gas Exchange: Night vs Day

Practical: The Effect of Light on Gas Exchange in Plants

Structure of the Breathing System

Role of the Intercostal Muscles & Diaphragm

Alveoli: Adaptations for Gas Exchange

Smoking & the Gas Exchange System

Practical: The Effect of Exercise on Breathing

Exam boards

Study tools

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