1. Cellular Respiration and Photosynthesis - An Introduction
Earth’s energy budget
Cellular energy (ATP)
Mitochondria
Solar energy
Chloroplasts
Chlorophyll
Photosynthesis vs. Cellular Respiration
Photosynthesis and life

2. 30% Reflected by Clouds or Earth’s Surface
19% Absorbed by Atmosphere and Clouds
0.023% absorbed by plants

3. Cell Currency (Payment)
Currency = Energy = ATP
We use currency (money) everyday in order to do things like buy food
Cells use currency (ATP) to perform 1000’s of chemical reactions every second to keep them alive

4. ATP (Energy/Currency for the Cell)
In order to keep the cell alive, it must perform 1000’s of reactions EVERY SECOND. Every reaction needs energy (ATP)
ATP is created during cellular respiration inside the Mitochondria

5. Cellular Respiration
The process where sugar (glucose) is converted into carbon dioxide, water and energy (ATP)
The organism uses this energy to do everything
Occurs in the mitochondria

6. Mitochondria "Powerhouse of the cell”
Cells that use a lot of energy have more mitochondria (i.e. muscle cells, brain cells)

7. Photosynthesis

8. Solar Energy
Solar cells convert light energy directly into electrical energy to work your TV, fan, etc.
Plants do something similar. They convert light energy into chemical energy (sugar) which the organism can use to move, talk, run, etc.

9. Chloroplasts Chloroplasts are located inside plants
They contain chlorophyll which gives plants their green color and also allows them to absorb light energy and convert it to chemical energy in the form of sugar
This process is called Photosynthesis

10. Carbon Dioxide + Water + Light Energy  Glucose (Sugar) + Oxygen
Photosynthesis
Performed in the Chloroplasts of plant cells
Carbon Dioxide + Water + Light Energy  Glucose (Sugar) + Oxygen
6CO2 + 6H2O  C6H12O6 + 6O2

11. Photosynthesis
+ Sugar (Glucose)

12. Chlorophyll is a Pigment
Chlorophyll is the most important pigment (color) present in plants.
Other pigments are also present in the leaf.
Carotenoids
(orange / red)
Xanthophylls
(yellow / brown)

13. Why are plants green?

14. Light Light we see comes in a spectrum from purple to red
Different substances absorb different colors depending on their structure
Colors that the substance doesn’t absorb, it reflects. We see that reflection as the objects color

15. Chlorophyll
Is a pigment that absorbs blue and red light but reflects green. The light is reflected into our eyes giving plants a green colour
High absorption
Low absorption/High reflection

16. How do plants use light?
Chlorophyll pigments absorb blue and red regions of the spectrum. They reflect the green regions
*Note* - reflecting green light also helps keep the plant cool

17. Carotenoids (other accessory pigments)
Other accessory pigments (called carotenoids) also absorb light energy. They absorb green and reflect yellow-to-red light. This gives them a yellow-red colour

18. Photosynthesis and Cellular Respiration
Notice Anything?
Cellular Respiration

19. Photosynthesis and Cellular Respiration
What is created in one reaction is used up in the other reaction!

20. Photosynthesis and Cellular Respiration are Connected
Photosynthesis vs. Respiration video

21. To Photosynthesize, or not to Photosynthesize, that is the question
Many organisms cannot photosynthesize (done by plants) they are called consumers
Consumers – an organism that obtains its energy from consuming other organisms
To obtain usable energy from food, consumers undergo cellular respiration.
THEREFORE…..

22. Photosynthesis and Life
We completely rely on the Sun!
No Sun = No Photosynthesis = No Food for plants = No Food for animals = No food for larger animals
No Sun = No life on Earth
This is the basis behind the dinosaur extinction

23. Thinking Map
Create a Venn diagram to compare and contrast Cellular Respiration with Photosynthesis.