the science of life

• seven typical characteristics of life, nutrition, repsiration, excretion, sensitivity, movement, growth and reproduction
• Nutrition: Organisms need food for energy and nutritents to carry out the vital fuctions of life. Animals eat plants or other animals while plants make their own food by photosynthesis
• Respiration: Organisims use food molecules to make energy available for body activites
• Excretion: organisims remove waste produced by chemical reactions occuring in their bodies. Animals ub the form of exhaled gas, sweat and urine. Plant shed leaves excrete as resin
• sensitivity: organisms have the ability to detect and respond changes in their environment. Animals have sensory organs and muscular systems to detect and respond to stimuli. Plants detect and grow towards light
• Movement: Animals move around to search for food, to find mates and to escape from danger. Plants detect and grow towards light and water
• Growth: Increase n body size and complexity
• Reproduction: Organisms produce offspring to ensure the continuity of life
• Scientific method

  1. Make observation
  2. Ask questions
  3. purpose a hypothesis
  4. Design and conduct experiements
  5. Anakyse data and draw conclusion
• • Independent variable is the factor under investigation
  • Dependent variable is the factor that changes according to the independent variable
  • Control variable are factors that are kept constant to ensure the investigation is a fair test