Lesson Plan Revised
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Transcript of Lesson Plan Revised
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Photosynthesis: Converting sunlight into chemical energy
Students who demonstrate understanding can:HS-LS1-5: Use a model to illustrate how photosynthesis transforms light energy into stored chemical energy.
+✔ For Understanding
To understand the process of photosynthesis we need to build off what we already know about:
Topic Examples
Molecules Water (H2O), Oxygen (O2 ), Carbon Dioxide (CO2)
Carbohydrates Sugar (glucose)
Organelles of Plant Cells Nucleus, Cell Wall, Chloroplast, Mitochondria
Energy Source for Cells ATP
Role of Coenzymes in Chemical Reactions
NADH
+In this lesson we learn: Sources of Oxygen
Where photosynthesis happens
Structure of chloroplasts
Two reactions of Photosynthesis
Steps of Photosynthesis
Locations, Reactants and Products of the two process of photosynthesis
Photosynthetic Equation
Driving Question: How does photosynthesis happen?
Try this: Lets all take a deep breath in and then slowly exhale out. Ready go!
Think-Pair-Share: Where do you think the oxygen (O2) we breathe comes from?
O2 is produced by different kinds of bacteria, algae, and plants (including trees) during photosynthesis.
About 25% of O2 comes from land plants.
So where does the other 75% come from? Well...
Most of Earth’s O2 comes from the ocean. Released from tiny ocean
plants called, phytoplankton.
+✔ For Understanding
Class Discuss: Where does most of the O2 we breathe come from? Did the answer surprise you?
Think-Pair-Share: How do you think photosynthesis happens?
Excellent! Now lets learn about WHERE and HOW photosynthesis happens!
+Class Discuss: What organelles are unique to plant cells? Where does photosynthesis take place in the cell?
+Chloroplast Anatomy: Notice this organelle has a double membrane (inner and outer) and has special structures inside. Inside the chloroplast are the sites of the two processes of photosynthesis. We will talk more about those sites in a couple slides!
First, lets learn more about chloroplast structure and functions!
Structure Functions
Chlorophyll (pigment)Allows plants to absorb energy from lightGives leaves their green color
Membrane EnvelopeProtects and keep chloroplast structures enclosed
Thylakoid membrane Flattened sac-like membrane structures called thylakoids Thylakoids serve as the sites of conversion of light energy to chemical energy.
GranumDense layered stacks of thylakoidsSites of conversion of light energy to chemical energy.
Stroma Dense fluid within the chloroplast Lies inside the envelope but outside the thylakoid membraneSite of conversion of carbon dioxide to carbohydrates
Class Discuss: Why are plants green?
+Now lets look at HOW photosynthesis happens:The processes of photosynthesis is categorized into two different reactions. These two reactions are called, light dependent reactions and light independent reactions. Light independent reactions are also referred to as Calvin Cycle.
Steps of Photosynthesis
1. The pigment, chlorophyll, in the chloroplasts absorbs light energy provided by the sun.
2. Chloroplasts use the light energy to split water molecules into oxygen which gets released into the atmosphere for us to breathe. The light energy also starts the two reactions of photosynthesis.
3. Light Reactions: Capture light energy and uses electrons from the splitting of water to make ATP and NADPH
4. Light Independent Reactions: Use CO2, ATP, and NADPH to make glucose.
https://www.youtube.com/watch?v=g78utcLQrJ4
Summary and Location of Reactions
Class Discuss: What are the two reactions of photosynthesis? What absorbs light energy?
Think-Pair-Share: Do you think light independent reactions use light energy?
Light Dependent Reactions Light Independent Reactions
Location Thylakoid Membrane
Reactants1. Sunlight 2. Water (H2O)
End Products1. ATP2. NADPH3. Oxygen (O2)
Location Stroma
Reactants1. ATP2. NADPH3. Carbon
Dioxide (CO2)
End Products 1. Sugar (glucose)
This entire process can be summarized into a single chemical equation:
Driving Question: How does photosynthesis happen? Light energy gets converted into
chemical energy.
Chemical energy is stored in the form of glucose (sugar).
Carbon dioxide, water, and sunlight are used to produce carbohydrates and oxygen.
Occurs in two stages: Light Dependent Reactions Light Independent Reactions
Think-Pair-Share: Why is photosynthesis essential to life on Earth? https://www.youtube.com/watch?v=eo5Xnd
Jaz-Y