1. Photosynthesis, Transpiration & Respiration

2. Warm-Up: 12/17
Read your NEW objective, essential questions, and agenda for today
Copy down your homework
Get out a pen/pencil
Pass up any late work
Answer the following:
What would happen if there were no green plants on Earth?

3. What is Photosynthesis?
The process of photosynthesis is a chemical reaction.
It is the most important chemical reaction on our planet.

4. What is the Equation for the Chemical Reaction of Photosynthesis?

5. EQUATION FOR PHOTOSYNTHESIS
WATER
OXYGEN
6CO2 +
6H2O +
ENERGY
C6H12O6 +
6O2
CARBON DIOXIDE
GLUCOSE

6. Six molecules of carbon dioxide react with six molecules of water to form 1 molecule of glucose and six molecules of oxygen.

7. Describe Photosynthesis

8. Describe Photosynthesis
The process of changing light energy to chemical energy
Energy stored as sugar (glucose)
Occurs in plants and some algae
Plants need light energy, CO2, and H2O
Takes place in the chloroplasts, using chlorophyll, the green pigment in plants

9. Chloroplast
Chlorophyll

10. What happens during photosynthesis?

11. What happens during photosynthesis?
Plants capture light energy and use that energy to make glucose
Sunlight provides the energy needed by chlorophyll to change molecules of carbon dioxide and water into glucose
Oxygen is also released in this reaction

12. What happens during photosynthesis?
Carbon dioxide enters the leaf through holes called stomata
CO2 combines with the stored energy in the chloroplasts through a chemical reaction to make glucose
The sugar is moved through tubes in the leaf to the roots, stems and fruits of the plants
Some of the sugar is used right away by the plant for energy; some is stored as starch; and some is built into plant tissue

13. Why is this important to us?

14. Why is this important to us?
We cannot make our own food (glucose, energy), we must get our food from plants.
Plants are the first step in the food chain.
The oxygen released during photosynthesis is necessary for all living things.
Mr. Parr's Photosynthesis song

15. What is Cellular Respiration?

16. What is Cellular Respiration?
The release of chemical energy for use by cells.

17. What is Cellular Respiration?
Once the energy that was in sunlight is changed into chemical energy by photosynthesis, an organism has to transform the chemical energy into a form that can be used by the organism.
This process is cellular respiration.

18. Describe Cellular Respiration
The breakdown of glucose molecules to release energy
Takes place in all living things
Is a step by step process

19. Cellular Respiration takes place in the Mitochondria

20. What is the chemical equation for cellular respiration?

21. EQUATION FOR RESPIRATION
CARBON DIOXIDE
ATP
GLUCOSE
C6H12O6 +
6O2
6CO2 +
6H2O +
ENERGY
OXYGEN
WATER

22. Cellular Respiration Song and
Mr. Parr
HIGH SCHOOL LEVEL

23. Read more about respiration:

24. Photosynthesis vs. Cellular Respiration
Occurs in the presence of light (and chlorophyll in plant cells)
Occurs at all times in cells
Requires energy (light) to make glucose (sugar)
Releases energy from glucose (sugar)
Carbon dioxide and water are needed.
Carbon dioxide and water are the waste products.
Oxygen is given out
Oxygen is taken in

25. Questions to Consider:
1. Would plants and animals be able to survive if photosynthesis did not occur? Why or Why not.
2. Would plants and animals be able to survive if respiration did not occur? Why or Why not.
3. How do the processes of respiration, photosynthesis, and transpiration allow organisms to survive?

27. TRANSPIRATION
The process by which liquid water changes into water vapor.
Transpiration is essentially evaporation of water from plant leaves.
Studies have revealed that about 10 percent of the moisture found in the atmosphere is released by plants through transpiration.

29. Cool Fact
An acre of corn gives off about 3,000-4,000 gallons (11,400-15,100 liters) of water each day, and a large oak tree can transpire 40,000 gallons (151,000 liters) per year.

30. Process for Transpiration
1. Plants absorb water from the soil.
2. The water moves through the roots to the stems through the xylem vessels to the leaves.
3. Once the water reaches the leaves, some of it evaporates from the leaves through the stoma. Which adds water vapor into the air.

32. Learn more about photosynthesis and transpiration at: