PhotosynthesisHarnessing the power of LIGHT to CREATE food!

By the end of this unit, you will be able to… Explain why plants are green. Identify where photosynthesis takes

place. Identify the structures of a chloroplast. Write the chemical equation of

photosynthesis. Explain how glucose is made. Compare and contrast the light

dependent and independent reactions

Essential Question: What is the process of photosynthesis and

where does it take place?

Objective: I can identify where photosynthesis takes place, write the chemical equation for photosynthesis, and explain why plants are green.

Let’s start this off with some MUSIC!

https://www.youtube.com/watch?v=8u_hwwztRqI

Photosynthesis- LIGHT White light from the sun is a blend of

many different wavelengths (colors) of light.

An object is a certain color because it RELFECTS a certain portion of the light and absorbs the rest.

• A leaf is green because it reflects green light.

Photosynthesis- ProducersProducers are organisms that make their own

energy. They do not eat.

Producers are autotrophs, meaning they make their own food.

Photosynthesis is a process that producers use to store light energy as chemical energy (usually in the form of sugars)

Chemical Equations Chemical equations have reactants (things that

chemically react) and products (that which is produced)

Reactants ---------------> Products

CAREFUL! Products are always on the end of the arrow

Products <------------------- Reactants

Pancake Recipe1 cup flour + 1 cup milk + 2 TBSP baking powder + 1 egg + 1 TSP salt

(REACTANTS) (heat)

-----------------------> 12 Pancakes(PRODUCTS)

Photosynthesis Equation light energy

6 CO2 + 6 H2O ------------> C6H12O6 + 6 O2

How to read that: Carbon dioxide + water + light YIELDS Glucose + oxygen

Reactants Products

absorbed by chlorophyll

Glucose provides the energy and carbon needed to make other plant materials like wax and proteins.

Where? Photosynthesis occurs in the Chloroplast

Stroma- fluid part of chloroplast (like cytoplasm) Grana- stack of thylakoids, contains chlorophyll Thylakoids- looks like stack of coins

Draw that! ----->

Here’s another picture of a chloroplast

And another…

Here’s what they look like, for real

What absorbs the light? Chlorophyll- green pigment in plants

that absorbs the energy from sun and converts it to chemical energy

Carotenoids- Yellow, orange & red pigments that absorb light energy and pass onto chlorophyll

Quiz Yo Self!! Using the white boards, write your

answer to the following questions.

USE YOUR NOTES!!

What is the light absorbing green pigment in chloroplasts called? A. CarotenoidsB. GreenC. ChlorophyllD. Water

What is the light absorbing green pigment in chloroplasts called? A. CarotenoidsB. GreenC. ChlorophyllD. Water

Light energy is converted to chemical energy through the process of….A. GlycolysisB. PhotosynthesisC. Cellular RespirationD. Fermentation

Light energy is converted to chemical energy through the process of….A. GlycolysisB. PhotosynthesisC. Cellular RespirationD. Fermentation

Plants appear green because…..A. They absorb green wavelengths of lightB. They reflect green wavelengths of lightC. They absorb blue and yellow wavelengths,

which makes greenD. It’s an optical illusion and we’re all seeing

different colors.

Plants appear green because…..A. They absorb green wavelengths of lightB. They reflect green wavelengths of lightC. They absorb blue and yellow wavelengths,

which makes greenD. It’s an optical illusion and we’re all seeing

different colors.

Which of the following is an example of an autotroph?A. DogB. CatC. ElephantD. Tree

Which of the following is an example of an autotroph?A. DogB. CatC. ElephantD. Tree

The TWO parts of a chemical equation are…A. Reactants and ProductsB. Oxygen and Carbon dioxideC. Mitochondria and chloroplastsD. Peanut butter and jelly

A. Reactants and ProductsB. Oxygen and Carbon dioxideC. Mitochondria and chloroplastsD. Peanut butter and jelly

The TWO parts of a chemical equation are…

Write out the CORRECT chemical equation for photosynthesis

Check Yo Self…

6 CO2 + 6 H2O ------------> C6H12O6 + 6 O2

In which organelle does photosynthesis take place?

A. MitochondriaB. Golgi bodyC. NucleusD. Chloroplast

In which organelle does photosynthesis take place?

A. MitochondriaB. Golgi bodyC. NucleusD. Chloroplast

Label the chloroplast!

Word Bank Stroma Grana Thylakoid Cell membrane

Label the chloroplast!Stroma

Grana

Thylakoid

Cell Membrane

Now you can…. Identify where photosynthesis takes

place Write the chemical equation for

photosynthesis Explain why plants are green!

Pat yourself on the back!

Essential Question What is the difference between the Light

Reaction and Calvin Cycle during photosynthesis?

Objective: I can explain how glucose is made.

Let’s Review! Using the notecards at your table,

rearrange them into the correct chemical equation for photosynthesis.

Does it look like this?

6 CO2 + 6 H2O ------------> C6H12O6 + 6 O2

2 CyclesThere are two cycles that work

together to create glucose (C6H12O6) Light Reactions (require light) Calvin Cycle (doesn’t require light or

dark)

Photolysis- when a chemical (like water) is broken down by photons

Light Reaction- Needs LightOccurs in the grana

of chloroplastsAdds a phosphate to

ADP to become ATP Splits water (H2O) to

release O2 (oxygen) and H+ (hydrogen) Sends H+ over to

Calvin CycleThat’s what we breathe!!

Remember Diffusion? After the Light

Reaction, oxygen (O2) diffuses out of the cell that we then breathe!

That pore is called a stomata

Calvin Cycle- Doesn’t need light! Occurs in the stroma of chloroplasts

Takes in CO2 (Carbon Dioxide) Uses the ATP (energy) and H+ from Light

Reaction Synthesizes (makes) GLUCOSE (C6H12O6)

This can happen day or night