Science - 2018-19

LS.3 - Cells & Cellular Organization

The student will investigate and understand that living things show patterns of cellular organization. Key concepts include

a) cells, tissues, organs, and systems; and

b) patterns of cellular organization and their relationship to life processes in living things. 

Bloom's Levels:  Analyze; Understand

Adopted: 2010


  • The cell, the basic unit of life, contains smaller organelles that assist in life processes that are similar in function to the larger organism.

  • I can explain why when one organ stops working, such as the kidney, the whole system shuts down.


  • Cells that have the same function group together to form tissues. Tissues that have the same function group together to form organs. Organs with similar functions group to work together in an organ system.
  • Unicellular organisms are made of only one cell. Multicellular organisms are made of many cells.
  • Multicellular organisms exhibit a hierarchy of cellular organization. They are complex in that there is a division of labor among the levels of this hierarchy for carrying out necessary life processes.
  • Cells perform numerous functions and processes including cellular respiration, waste breakdown and removal, growth and division, and cellular transport.
  • Osmosis is the passive transport of water molecules across a cell membrane. Diffusion is the passive transport of substances other than water across a cell membrane. Cell membranes are selectively permeable to various substances. (A discussion of facilitated diffusion, tonicity, and active transport should be reserved for high school Biology.)
  • Living things carry out life processes including ingestion, digestion and removal of waste, stimulus response, growth and repair, gas exchange, and reproduction.
  • Numerous factors can strongly influence the life processes of organisms.


In order to meet this standard, it is expected that students will

a)  explain the relationship among cells, tissue, organs, and organ systems.

differentiate between unicellular organisms and multicellular organisms and name common examples of each.

compare and contrast how unicellular and multicellular organisms perform various life functions. This includes the application of knowledge about systems in organisms.

b)  explain the role that each life function serves for an organism: ingestion, digestion and removal of waste, stimulus response, growth and repair, gas exchange, and reproduction.

explain that there is a specific range or continuum of conditions that will meet the needs of organisms.

a, b)  model how materials move into and out of cells in the processes of osmosis, diffusion, and selective permeability. This includes creating and interpreting three-dimensional models and/or illustrations demonstrating the processes involved. Students should be able to analyze the components of these models and diagrams and communicate their observations and conclusions.

create plausible hypotheses about the effects that changes in available materials might have on particular life processes in plants and in animals.

conduct basic investigations related to understanding cellular organization, with emphasis on observations of cells and tissue. 


unicellular organism, multicellular organism, waste removal, irritability, reproduction, diffusion, osmosis, passive transport, active transport, photosynthesis, cellular respiration, cells, tissues, organs, organ system, organism, homeostasis, stimulus, response, sexual reproduction, asexual reproduction

Updated: Jun 29, 2018