Levels of Biological Organization Quiz

Levels of Biological Organization

• Biological organization is a hierarchy from simplest (atoms) to most complex (biosphere).
• Atoms are the fundamental units of matter.
• Molecules are combinations of atoms (ionic or covalent bonds).
• Organelles are structures inside cells.
• Cells are the basic units of life.
• Tissues are groups of cells with the same function.
• Organs are groups of tissues performing specific functions.
• Organ systems are two or more organs working together for a common function.
• Organisms are composed of different body systems; they are self-contained individuals.
• Populations are organisms of the same species in a given area.
• Communities are different populations in an area.
• Ecosystems are communities plus the abiotic (non-living) parts.
• Biomes are characterized by common plants, animals, and abiotic factors due to their environments.
• The biosphere is the zone of life on Earth, encompassing all ecosystems.

Formative Activity Answers

• What is the most complex level of organization? Organism
• Organs that work together to perform a related function are called ___? Organ system
• The human body is composed of organ systems. Which list represents a system from the least to most complex? Muscle cell --> muscle tissue --> biceps muscle --> muscular system
• Which of the following best describes a tissue? Group of cells working together to perform a specific function.
• What is a multicellular organism? An organism with two or more cells.
• Mitzi has learned that the brain, spinal cord, and peripheral nerves work together. What do they combine to form? Organ system
• An organism such as a worm may only have 100 cells. It should be classified as being ____. Multicellular organism.
• Which of the following examples is correctly matched with its level of organization? The skin is an organ.
• Cells are..... Structural and functional units of all living things.
• Which of the following displays the levels of organization INCORRECTLY from smallest to largest? Community, Ecosystem, Biome, Biosphere (should be Biosphere, Biome, Ecosystem, Community)