Sun. Sep 26th, 2021

1.1 Characteristics

Characteristics of Living Organisms: Basics

  • Movement: an action by an organism causing a change of position or place
  • Respiration: the chemical reactions that break down nutrient molecules in living cells to release energy
  • Sensitivity: the ability to detect and respond to changes in the environment
  • Growth: a permanent increase in size
  • Reproduction: the processes that make more of the same kind of organism
  • Excretion: the removal from organisms of toxic materials and substances in excess of requirements
  • Nutrition: the taking in of materials for energy, growth and development

Exam Tip

Use this mnemonic to help you remember these processes:

MRS. H. GREN

Movement
Respiration
Sensitivity
Homeostasis
Growth and development
Reproduction
Excretion
Nutrition

Extended Only

Characteristics of Living Organisms

  • Movement: an action by an organism or part of an organism causing a change of position or place
  • Respiration: the chemical reactions that break down nutrient molecules in living cells to release energy for metabolism
  • Sensitivity: the ability to detect or sense stimuli in the internal or external environment and to make appropriate responses
  • Growth: a permanent increase in size and dry mass by an increase in cell number or cell size or both
  • Reproduction: the processes that make more of the same kind of organism
  • Excretion: the removal from organisms of toxic materials, the waste products of metabolism (chemical reactions in cells including respiration) and substances in excess of requirements
  • Nutrition: the taking in of materials for energy, growth and development; plants require light, carbon dioxide, water and ions; animals need organic compounds, ions and usually need water

By Merito

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