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  • IGCSE Edexcel
  • Biology
  • 1. The Nature & Variety of Living Organisms

Biology

  • IGCSE Edexcel
  • Revision Notes

1. The Nature & Variety of Living Organisms


1.1 Characteristics of Living Organisms>

2. Structure & Function in Living Organisms

2.1 Level of Organization >2.2 Cell Structure >2.3 Biological Molecules >2.4 Movement of Substances Into and Out of Cells >2.5 Nutrition (in Plants) >2.6 Nutrition (in Human) >2.7 Respiration >2.8 Gas Exchange (in Plants) >2.9 Gas Exchange (in Human) >2.10 Transport (in Plants) >2.11 Transport (in Human) >2.12 Excretion (in Plants) >2.13 Excretion (in Human) >2.14 Coordination and Response (in Plants) >2.15 Coordination and Response (in Human) >

3. Reproduction & Inheritance

3.1 Reproduction (in Plants) >3.2 Reproduction (in Human) >3.3 Inheritance >

4. Ecology & The Environment

4.1 The Organism in the Environment >4.2 Feeding Relationships >4.3 Cycles within Ecosystems >4.4 Human Influences on the Environment >

5. Use of Biological Resources

5.1 Food Production >5.2 Selective Breeding >5.3 Genetic Modification (Genetic Engineering) >5.4 Cloning >

1.1 Characteristics of Living Organisms

1.1.1 Understand how living organisms share the following characteristics:

  • They require nutrition
  • They respire
  • They excrete their waste
  • They respond to their surroundings
  • They move
  • They control their internal conditions
  • They reproduce
  • They grow and develop.

Characteristics of living organisms

  • All living organisms share the same characteristics
  • Acronym: MRS H GREN
Movement A change in position or place
Respiration Chemical reactions that break down glucose to release energy needed for cellular activities
Sensitivity Ability to detect and respond to stimuli in the surroundings
Homeostasis Control of internal environment in order to keep conditions within required limits
Growth Permanent increase in size
Reproduction Production of more of the same kind of organism
Excretion Removal of toxic materials and wastes from organisms
Nutrition Taking of food to provide energy
Previous7.5 Appendix 5: Notation
Next2.1 Level of Organization

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