1. Photosynthesis
Biology
Fall 2017

2. In the photosynthesis equation, what does the arrow represent? 
Question
In the photosynthesis equation, what does the arrow represent? 

3. Photosynthesis
Nearly all living things obtain energy either directly or indirectly.
The energy comes from sunlight.
The energy from sunlight is captured during photosynthesis.

4. Photosynthesis
Photosynthesis is a process by which a cell captures energy in sunlight
The energy is used to make food.
Plants (such as grass) use energy from the sun to make its own food.
Therefore it is called an autotroph.

5. Photosynthesis The caterpillar obtains energy from eating grass.
The bird obtains energy by feeding on the caterpillar. 
These organisms which cannot make their own food are called heterotrophs.

6. Photosynthesis
During photosynthesis, autotrophs use the sun’s energy to convert carbon dioxide (CO2) and water (H2O)
6CO2 + 6H2O
Into (or yields) 
Oxygen (O2) and sugars (C6H12O6)
O2 + C6H12O6

7. Photosynthesis Two stages of photosynthesis
Stage 1: Capturing the sun’s energy
Process occurs mostly in leaves
Chloroplasts in plant cells capture energy using a photosynthetic pigment called chlorophyll.
This energy powers stage 2

8. Photosynthesis Stage 2: Using the sun’s energy to make food
Cells need H2O and CO2 for this stage.
CO2 enters the leaves through stomata.
H2O enters through the roots.

9. Photosynthesis
CO2 and H2O undergo chemical reactions in chloroplasts to produce sugars (C6H12O6) and oxygen (O2).
Sugar and oxygen leave through the stomata.

10. In the photosynthesis equation, what does the arrow represent?
Question
In the photosynthesis equation, what does the arrow represent? 
“Yields”
“Goes to make”
“Forms”

11. Do you like the Magic School Bus?
Photosynthesis
Do you like the Magic School Bus?