Comparing Photosynthesis and Cellular Respiration

 Comparing Photosynthesis and Cellular Respiration

Compare photosynthesis and aerobic cellular respiration by completing the table and writing ‘yes’ or ‘no’ in the correct column.  Justify your responses in the ‘explanation row’ that follows each question - Comparing Photosynthesis and Cellular Respiration introduction. The first item is completed for you.

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More Essay Examples on Comparison Rubric

Concept
Photosynthesis
Cellular Respiration
1.Oxygen required to complete reaction
no
yes
Oxygen serves as the final electron acceptor in cellular respiration.

2. Produces molecules of oxygen
yes
no
The electrons that chloroplasts lost during the first stage of photosynthesis are recovered through a process called photolysis which requires water molecules and produces oxygen molecules.

3. Produces molecules of carbon dioxide
no
yes
CO2 is produced during the citric acid cycle of cellular respiration when acetyl-CoA is oxidized.

4. Requires the energy of sunlight to initiate
yes
no
Energy from light is used to excite electrons from chloroplasts allowing the start of the flow of electrons in the electron transport chain.

5. Glucose or other food molecules required to initiate
no
yes
The first stage of cellular respiration, called glycolysis, involves the breaking of the six-carbon glucose molecule into two three-carbon pyruvic acid.

6. Represents an endergonic reaction
yes
no
Photosynthesis requires an external source of light energy to complete the process whereas cellular respiration does not need an external source of energy.

7. Produces ATP energy from chemical energy in food
no
yes
The main function of cellular respiration is to generate and store energy in the form of ATP.

8. Heterotrophic organisms undergo this process
no
yes
Heterotrophic organisms are incapable of producing their own energy source and have to rely to other organisms to obtain glucose necessary for cellular respiration to generate and store energy.

9. Autotrophic organisms undergo this process
yes
yes
More particularly photosynthetic autotrophs are capable of producing organic substances with the use of light energy. Autotrophs also perform cellular respiration to perform its other functions.

10. Requires water molecules to initiate
yes
no
Water molecules are necessary to replace the lost electron during the first stage of photosynthesis.

11. Produces molecules of glucose
yes
no
Carbon fixation occurs during the dark reaction stage of photosynthesis which produces three-carbon sugars which are then converted into carbohydrates including glucose.

12. Does not require ATP
no
no
Both photosynthesis and cellular respiration uses ATP at some point during the processes.

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