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• Organisms : Unicellular organism

  1. Once cell

  E.g. ; Bacteria
• Organisms : Multicellular cells

  1. many cells

  E.g. ; worm, mushroom, cat
• multicellular organisms are made up of many different types of cells corking together
• (specialized cells)

  A cell is a basic unit of life. It is specialized to carry out a specific function
• Tissue

  A tissue is made up of a group of similar or different cells that work together to carry out a specific function
• Organ

  An organ is made up of different tissues that work together to carry out a specific function
• System

  A system is made up of several related organs that work together to carry out a specific function
• Organism

  A multicellular organism is made up of organ systems that work together to keep the organism alive
• Cell

  Human :

  human muscle cell

  • Contracts and relaxes rhythmically to pump blood around the body

  Plant :

  Regularly-shaped plant cells

  • Densely packed with chloroplast
  • Found mainly at upper layer of the leaves
• Tissue

  Human :

  Heart muscle tissue

  • Many heart muscle cells come together to form heart muscle tissues
  • contract and relax rythmically at a steady rate

  Plant :

  Tissue in leaf

  • Regularly shaped cells are grouped together in neat rows to form a type of tissue in leaf
  • This leaf tissue makes food through photosynthesis
• Organ

  Human :

  Heart

  • Heart muscle tissues, nerve tissues, and connective tissues collectively form the heart, which pumps oxygen rich in blood to all cells in the body

  Plant :

  Leaf

  • Different types of leaf tissues form a leaf - an organ where food substances are formed through photosunthesis
• Systems

  Human :

  Circulatory system

  • Heart, arteries and veins work together to transport blood to all parts of the body

  Plant :

  Root and shoot systems

  • Root system takes in water and dissolved mineral salts from the soil into the plant
  • Shoot system transports water to leaf where it is required for photosynthesis
• Organism

  Human :

  • Circulatory system works with other organ systems to ensure that human body functions properly

  Plant :

  • Root and shoor systems work together to help plant grow and function properly.
• Division of labor

  Division of labor refers to the breakdown of work into small and specific tasks for maximum efficiency

  • efficiency Various functions can be carried out efficiently and at the same time
  • Occurs within cells and in multicellular organisms
• Division of labor


  (in multicellular organisms) Work is divided among each type of cell, tissue and organ
• Organs in the body

  • Lungs in respiratory system
  • Heart in circulatory system
  • Red blood cells
• Roles of organs

  1. Lungs allow us to take in oxygen needed to release energy from food

  2. Heart pumps blood around the body

  3. Red blood cells transport oxygen to all parts of the body
• Muscle tissue


  • Uses the released energy to contract and relax so that we can move about