MS - LS1.C (B) and PS3.D (B) - Energy Flow in Organisms - FINAL (WND 2/3/2014)

Module: Energy Flow in Organisms

DCI: LS1.C (B) Within individual organisms, food moves through a series of chemical reactions in which it is broken down and rearranged to form new molecules, to support growth, or to release energy.

DCI: PS3.D (B) Cellular respiration in plants and animals involve chemical reactions with oxygen that release stored energy. In these processes, complex molecules containing carbon react with oxygen to produce carbon dioxide and other materials.

PE: MS-LS1-7 Develop a model to describe how food is rearranged through chemical reactions forming new molecules that support growth and/or release energy as this matter moves through an organism.

[Clarification Statement: Emphasis is on describing that molecules are broken apart and put back together and that in this process, energy is released.] [Assessment Boundary: Assessment does not include details of the chemical reactions for photosynthesis or respiration.]

The ideas we see in this standard are: 

- food goes through chemical reactions within individual organisms

- food molecules are broken down to form new molecules

- the new molecules formed are used to support growth or release energy within the organism 

- cellular respiration is the process by which plants and animals use oxygen to release stored energy 

- in cellular respiration, complex molecules (which contain carbon) react with oxygen to produce carbon dioxide and other materials 

The 'model' mentioned in the PE might be a conceptual model of the process of cellular respiration in plants and animals, or might be on the breaking down of food molecules into new molecules, releasing energy.  It is not necessary, for this standard, that the steps of the chemical reactions are known.  

Possible Question Starters: 

"A partial concept map for a process that takes place within the cells of individual organisms is provided.

Food consumed --> ? --> Energy released

Which of the following would best replace the "?" in the concept map?

correct answer- chemical reactions

incorrect answer - water absorbed

"Which of the following best summarizes the process of cellular respiration in plants and animals?"

correct answer - carbon based molecules react with oxygen molecules to produce carbon dioxide and other materials

incorrect answer - water molecules react with carbon dioxide to produce carbon based molecules and other materials