characteristics of living things

• Metabolism is the sum of all

  the chemical reactions in an

  organism.
• Continuity of Life means that

  all living things arise from other

  living things of the same type.
• Life is defined as the possession of all of the

  following characteristics: organised require

  nutrition and excretion, capable of responding

  and reproducing.
• Organisation means that

  all living things are

  composed of cells.
• while others are

  multicellular e.g. humans.
• Some organism are

  single-celled, e.g. bacteria
• Nutrition is the

  way that

  organisms obtain

  and use food
• Autotrophic

  Organisms can make their own

  food

  Example: Plants make their own

  food through photosynthesis
• Heterotrophic

  Organisms cannot make their own

  food.

  Example: Human cannot make

  their own food, we need to eat food

  from other sources
• Excretion is the removal of waste

  products of metabolism from an
• Plants

  Plants excrete waste gases (

  oxygen, water vapour)

  through openings called

  stomata on the underside of

  leaves.
• Animals

  Human excrete waste

  products in from three

  structures, the skin, the lungs

  and the urinary system.
• Response is the way in which all living

  things react to changes in their

  environment.
• Plants respond to light, gravity,

  touch and water.
• Animals respond to things such as

  light, sound, temperature, smell,

  pressure and movement.
• Reproduction

  is the

  production of

  new individuals
• Asexual Reproduction

  Axsexual reproduction involves

  only one parent.

  Examples: bacterial cells diving in

  two, strawberry runners.
• Sexual Reproduction

  Sexual reproduction involves two

  parents.

  It involves the union of a male and

  female gamete to produce a

  zygote.