1. How Do Plants Capture Energy From the Sun and Make Food?
An Introduction to Photosynthesis

2. What are we learning today?
Benchmarks:
Objectives:
I will state the overall equation of photosynthesis.
I will explain how photosynthesis and cellular respiration are part of an interrelated cycle.
I will describe the factors that affect photosynthesis.
SC.912.L.14.7*
SC.912.L.18.7-Identify the reactants, products, and basic functions of photosynthesis.
SC.912.L.18.9*- Explain the interrelated nature of photosynthesis and cellular respiration.  

3. What are autotrophs and heterotrophs?
REVIEW
What are autotrophs and heterotrophs?
Plants, algae, and some bacteria use light energy
from the sun to produce food.
They are called photosynthetic autotrophs.
Animals, fungi, protozoa, and some bacteria obtain energy from the food they consume.
They are called heterotrophs.
Chemosynthetic vs photosynthetic

4. What is photosynthesis?
Take Notes
What is photosynthesis?
Comes from the Greek words:
photo - light
synthesis - putting together
Therefore, it means “using light to put something together”
Photosynthesis occurs in the cells’ chloroplasts found in the leaves.
During photosynthesis in the Chloroplasts, plants use energy from sunlight to convert water (H2O) and carbon dioxide (CO2) into carbohydrates (C6H12O6) and oxygen (O2). The energy is now STORED in the carbohydrate molecule.
YOU MUST KNOW THIS EQUATION!
Explain the equation
Reactants vs products
Needs vs makes
Explain LIMITING FACTORS to preface lab
Take away light source, no photosyn.
6 CO2 + 6 H2O+ light C6H12O6 + 6 O2

5. Reactant or Product?
Oxygen
Reactant or Product?
Sugar
Reactant or Product?
Water

6. What Other Organisms Can Perform Photosynthesis?
Algae (protist)– eukaryotic and autotrophic like a plant BUT… may be unicellular or multicellular, while all plants are multicellular
Algae do not have roots, stems, leaves, flowers, seeds, or cones like plants do– EVERY cell in the algae has to get its own nutrients
3 Groups of Bacteria: Cyanobacteria Chlorobi and Proteobacteria 
(blue-green) (green) (purple) surface waters deep waters most similar to plants use H2S instead of H2O First Oxygen

7. Exit Slip
What do we know?
1. The overall process of photosynthesis can be represented using a chemical equation. Like all chemical equations, the equation for photosynthesis must obey the law of conservation of mass. Which of the following is the correct and balanced equation for photosynthesis? A. CO2 + H2O C6H12O6 + O2 B. 6CO2 + H2O C6H12O6 + O2 C. CO2 + 6H2O C6H12O6 + 6O2 D. 6CO2 + 6H2O C6H12O6 + 6O2 7

8. Exit Slip
What do we know?
2. Which of these statements correctly describes the process of photosynthesis?
A. Photosynthesis is an exothermic process because it releases energy.
B. Photosynthesis is an endothermic process because it releases energy.
C. Photosynthesis is an endothermic process because it requires the absorption of energy.
D. Photosynthesis is an exothermic process because it requires the absorption of energy. 8

9. What do we know? Exit Slip
Scientists are measuring the rate at which carbon dioxide (CO2) and water are converted to glucose and oxygen (O2) per hour in various types of houseplants with the same biomass. The houseplants are all exposed to the same amount of sunlight and to the same conditions. The data they collect is given in the table.
ALOE VERA
COLEUS
POTHOS
SPIDER PLANT
AMOUNT OF CO2 ABSORBED
180 mL
168 mL
164 mL
175 mL
AMOUNT OF O2 RELEASED
150 mL
ANSWER IS C. 9

10. What do we know? Exit Slip
3. What is the most likely reason that the plants absorb different amounts of CO2? A. The plants are different heights. B. The plants have different masses. C. The plants have different size leaves. D. The plants are different shades of green.
ANSWER IS C.
ALOE VERA
COLEUS
POTHOS
SPIDER PLANT
AMOUNT OF CO2 ABSORBED
180 mL
168 mL
164 mL
175 mL
AMOUNT OF O2 RELEASED
150 mL 10

11. What do we know? Exit Slip
4. In which process do these plants absorb CO2, water, and sunlight to produce glucose and O2? A. mitosis B. photosynthesis C. replication D. respiration
ANSWER IS B.
ALOE VERA
COLEUS
POTHOS
SPIDER PLANT
AMOUNT OF CO2 ABSORBED
180 mL
168 mL
164 mL
175 mL
AMOUNT OF O2 RELEASED
150 mL 11