Photosynthesis and Respiration

Biology I

Mr. Beaty

Thomasville HS

Bellringer How do autotrophs and

heterotrophs obtain energy? How is photosynthesis different

from respiration? Can animals that do not use the

sun live without it? Explain.

PhotosynthesisPhotosynthesis

Cellular RespirationCellular Respiration

AutotrophsAutotrophs Autotrophs and Heterotrophs

Autotrophs and Heterotrophs

LightEnergyLight

Energy

Organic Compounds + Oxygen

Carbon Dioxide + Water

What is ATP? ATP is a compound that stores energy. The energy is stored in the bonds that

hold the phosphates together. ADP plus phosphate = ATP ADP can be recycled. How are ADP and ATP similar to

batteries?

Photosynthesis What is the overall formula for photosynthesis?

6CO2 + 6H20 C6H12O6 + 6O2

How does this formula compare to the overall formula for aerobic respiration?

It is the complete opposite!

C6H12O6 + 6O2 6CO2 + 6H20 + E

L

Photosynthesis Plants and some other organisms are

autotrophs. Like Bacteria, Protista Autotrophs make their own food by

converting sunlight energy into chemical energy that is stored in chemical bonds.

The process is know as photosynthesis.

Photosynthesis Plants use specialized structures called

chloroplasts. The chloroplast has two membranes,

an inner and outer membrane. Inside the inner membrane are flattened sacs called thylakoids.

Each stack of thylakoids are known as granum.

Photosynthesis Surrounding the thylakoids is a

solution called stroma. Located in the thylakoid membrane

are pigments that absorb light energy. The most famous pigment is called

chlorophyll.

Bellringer Where does photosynthesis occur? Why do plants carry it out? What are the parts of the chloroplast? What is the main pigment found in

chloroplasts? What is the ADP – ATP Cycle? What colors of light do pigments best

absorb?

Draw a picture of the chloroplast and label its parts. Quiz your partner until both of you

can identify the major components of the chloroplast.

Where does the light reaction occur? Where does the dark reaction occur?

Light Reaction

Sun

Photosystem II Photosystem I

Sun

ETC ETC

ATP

NADP+

NADPH

Water is split into H and O2

Water is split into H and O2

Pairs Using the models, take turn explaining

the steps of photosynthesis to your partner.

What reactants are used in the light reaction? What products come out?

Assignment- Start today, finish next week. Complete 6-1 study guide and active

reading assignment.

Bellringer

PhotosynthesisPhotosynthesis

Cellular RespirationCellular Respiration

AutotrophsAutotrophs Autotrophs and Heterotrophs

Autotrophs and Heterotrophs

LightEnergyLight

Energy

Organic Compounds + Oxygen

Carbon Dioxide + Water

Light Reaction Videos http://www.sumanasinc.com/webcontent/a

nisamples/majorsbiology/harvestinglight.swf

http://highered.mcgraw-hill.com/sites/0072437316/student_view0/chapter10/animations.html

Photosynthesis Once the light reaction creates

NADPH and ATP, these products are used to power the Calvin cycle.

The Calvin cycle converts CO2 into organic compounds. It takes many turns of the cycle to produce a single molecule of glucose.

Calvin Cycle

NADPH ATP

CO2

Organic Compounds

Pairs Using the models, take turn explaining

the steps of photosynthesis to your partner.

What reactants are used in the light reaction? What products come out?

What reactants are used in the Calvin Cycle? What products come out?

Balance Sheet for Photosynthesis1. Water is split in the light reaction that produces ATP and NADPH. 2. NADPH and ATP are used to power the Calvin Cycle which fixes molecules of CO2 into organic compounds. 3. One turn of the Calvin Cycle fixes one molecule of CO2.

4. A variety of organic compounds are formed, including amino acids, lipids, and carbohydrates.

• Most typically the carbohydrate glucose (C6H12O6) is used in the formula. CO2 + H20 => C6H12O6 + O2

Other pathways The Calvin cycle fixes carbon into 3

carbon compounds. C4 pathway fixes carbon into 4 carbon

compounds. CAM pathway – Adaptation made for

plants that grow in hot dry climates. Exchange gases at night and the Calvin cycle occurs during the day.

Pairs How are CAM and C4 pathways different

than normal photosynthesis? Make a chart that compare the three

different pathways. What type of plants benefit from the CAM

pathway? What is one downfall of the CAM cycle?

The rate of photosynthesis Environmental factors can affect the

rate of photosynthesis. Analyze the graphs with your partner

and discuss how temperature and light affect the rate of photosynthesis. (pg 124)

Homework Complete Ch 6 Reading Guide and Active

Reading 6.2.

Summary What is the overall formula for

photosynthesis? Why do we need plants in order to

survive? Describe what happens in the light and

dark reaction(Calvin Cycle) of photosynthesis.