1. Section 2 Cell Energy
Chapter 4
Bellringer
Make a list of all the different types of cells that you can think of and the jobs they do. Then make a list of all the reasons that a cell needs energy.

2. Chapter 4 Objectives Describe photosynthesis and cellular respiration.
Section 2 Cell Energy
Chapter 4
Objectives
Describe photosynthesis and cellular respiration.
Compare cellular respiration with fermentation.

3. Chapter 4 Vocabulary photosynthesis chlorophyll cellular respiration
Section 2 Cell Energy
Chapter 4
Vocabulary
photosynthesis
chlorophyll
cellular respiration
fermentation

4. Chapter 4 From Sun to Cell
Section 2 Cell Energy
Chapter 4
From Sun to Cell
Photosynthesis is the process by which plants, algae, and some bacteria use sunlight, carbon dioxide, and water to make food.
Chlorophyll Plant cells have molecules that absorb light energy. These molecules are called pigments. Chlorophyll, the main pigment used in photosynthesis, gives plants their green color.

5. Section 2 Cell Energy
Chapter 4

6. Getting Energy from Food
Section 2 Cell Energy
Chapter 4
Getting Energy from Food
Most complex organisms, such as plants and animals, obtain energy through cellular respiration, which uses oxygen to break down food.
During cellular respiration, food (such as glucose) is broken down into carbon dioxide and water, and energy is released.
Most of the process of cellular respiration takes place in the cell membrane of prokaryotic cells. But in the cells of eukaryotes, cellular respiration takes place mostly in the mito-chondria.

7. Section 2 Cell Energy
Chapter 4

8. Getting Energy from Food, continued
Section 2 Cell Energy
Chapter 4
Getting Energy from Food, continued
Connection Between Photosynthesis and Respiration During photosynthesis, cells take in carbon dioxide and release oxygen. During cellular respiration, cells use oxygen to break down glucose and release energy and carbon dioxide.
Fermentation When muscles can’t get the oxygen for cellular respiration, they use fermentation to get energy. Fermentation is the breakdown of food without the use of oxygen.

9. Section 2 Cell Energy
Chapter 4

10. Chapter 4 Section Summary
Section 2 Cell Energy
Chapter 4
Section Summary
Most of the energy that fuels life processes comes from the sun.
The sun’s energy is converted into food by the process of photosynthesis.
Cellular respiration breaks down glucose into water, carbon dioxide, and energy.
Fermentation is a way that cells get energy from their food without