Energy Cycle Review Handout
Biology Review Sheet
Cell Energy: The Great Cycle
Photosynthesis & Cellular Respiration: Two sides of the same coin
Name:
Date: Period:
The Golden Rule: What one process makes (products), the other process uses (reactants). Matter is recycled over and over!
1. The Connected Cycle (How They Work Together)
Photosynthesis
Organelle: Chloroplast
Found in: Plants & Algae
Traps Sunlight to make food (Glucose)
Glucose + O₂ ━━━━▶
◀━━━━ CO₂ + H₂O
Cellular Respiration
Organelle: Mitochondria
Found in: ALL Living Things (Plants & Animals)
Breaks down Glucose to make ATP (Energy)
2. Chemical Formulas Decoded
Photosynthesis Equation (Stores Light Energy in Sugar)
Carbon Dioxide + Water + Sunlight ━━▶ Glucose (Sugar) + Oxygen
6CO₂ + 6H₂O + Light ➔ C₆H₁₂O₆ + 6O₂
Reactants (Inputs - What goes in) Products (Outputs - What comes out)
Cellular Respiration Equation (Releases Usable ATP Energy)
Glucose (Sugar) + Oxygen ━━▶ Carbon Dioxide + Water + ATP
C₆H₁₂O₆ + 6O₂ ➔ 6CO₂ + 6H₂O + ATP
Reactants (Inputs - What goes in) Products (Outputs - What comes out)
| Feature | Photosynthesis | Cellular Respiration |
|---|
| Main Purpose | To MAKE food (glucose sugar) | To BREAK DOWN food into cell energy (ATP) |
| Organelle (Where?) | Chloroplast | Mitochondria (Powerhouse) |
| Who Does It? | Plants, algae, autotrophs | ALL living things (plants AND animals!) |
| Energy Form | Takes in Light Energy | Produces Chemical Energy (ATP) |
| Gases Involved | Takes in CO₂, releases O₂ | Takes in O₂, releases CO₂ |
Page 1: Concept Reference Turn Over for Practice ➔
Check Your Knowledge
Energy Practice & Review
Use Page 1 to help you complete each section!
Part A: Complete the Cycle Diagram
Fill in the blank boxes using the Word Bank
Word Bank
Sunlight Chloroplast Mitochondria Glucose + Oxygen (O₂) CO₂ + Water (H₂O) ATP Energy
Organelle 1 (Plants)
Energy Input:
Top Flow (━━▶)
Bottom Flow (◀━━)
Organelle 2 (All Cells)
Energy Output:
Part B: Identify the Process
Write P for Photosynthesis or R for Respiration
1. Occurs inside the chloroplast.
2. Occurs inside the mitochondria.
3. Releases oxygen (O₂) into the air.
4. Done by both plant and animal cells.
5. Creates ATP energy for cell work.
6. Uses sunlight to make glucose.
Part C: Inputs (Reactants) & Outputs (Products)
Write the chemical formula in the correct box
Water = H₂O
Carbon Dioxide = CO₂
Oxygen = O₂
Glucose = C₆H₁₂O₆
| Process | Reactants (What Goes IN) | Products (What Comes OUT) |
|---|
| Photosynthesis | | |
| Cellular Respiration | | |
Part D: Explain the Connection (Big Idea)
Complete the sentences below to explain how plants and animals help each other survive:
1. Plants produce and during photosynthesis.
2. Animals and humans need these products so their cells can perform .
3. In return, cellular respiration releases , which plants need to start the cycle again!
Page 2: Review & Self-Check Score: _______ / 20
