The Energy CycleThe Energy Cycle

Photosynthesis and RespirationPhotosynthesis and Respiration

77thth Grade Life Science Grade Life Science

PhotosynthesisPhotosynthesis

Materials NeededMaterials Needed SunlightSunlight Carbon dioxide Carbon dioxide

COCO22

Water HWater H22OO

PhotosynthesisPhotosynthesis

Who – What organisms can perform Who – What organisms can perform photosynthesis?photosynthesis? All plantsAll plants Some bacteriaSome bacteria Some protistsSome protists

PhotosynthesisPhotosynthesis

Where – Where in the cell does photosynthesis Where – Where in the cell does photosynthesis happen?happen? ChloroplastChloroplast

PhotosynthesisPhotosynthesis

What – What happens in the chloroplasts?What – What happens in the chloroplasts? Sunlight is absorbed by the green pigment Sunlight is absorbed by the green pigment

chlorophyllchlorophyll along with carbon dioxide and along with carbon dioxide and waterwater

A chemical reaction occurs that produces A chemical reaction occurs that produces glucose Cglucose C66HH12120066 and oxygen 0 and oxygen 022

PhotosynthesisPhotosynthesis

When – When does photosynthesis occur?When – When does photosynthesis occur? In the presence of sunlightIn the presence of sunlight

PhotosynthesisPhotosynthesis

Why – Why is photosynthesis so important?Why – Why is photosynthesis so important? Provides food for living thingsProvides food for living things Provides oxygen for living thingsProvides oxygen for living things Regulates carbon dioxide in the atmosphereRegulates carbon dioxide in the atmosphere

PhotosynthesisPhotosynthesis

How – How does photosynthesis happen?How – How does photosynthesis happen? A Chemical ReactionA Chemical Reaction Formula:Formula:

6CO6CO22 + 6H + 6H22O + light energyO + light energy CC66HH1212OO66 + +

6O6O22

PhotosynthesisPhotosynthesis

ProductsProducts Food (Glucose)Food (Glucose)

Some of which is used by the plant for Some of which is used by the plant for energyenergy

Some of which is stored by plant in the Some of which is stored by plant in the vacuolesvacuoles

OxygenOxygen Released into the atmosphereReleased into the atmosphere

RespirationRespiration

Materials NeededMaterials Needed Oxygen OOxygen O22

Glucose (Food in the form of a type of Glucose (Food in the form of a type of sugar) Csugar) C66HH1212OO66

RespirationRespiration

Who – What organisms can perform Who – What organisms can perform respiration?respiration? All living thingsAll living things

RespirationRespiration

Where – Where in the cell does respiration Where – Where in the cell does respiration happen?happen? MitochondriaMitochondria, the cell’s “power house”, the cell’s “power house”

RespirationRespiration

What – What happens in the What – What happens in the mitochondriamitochondria?? A complex chemical reaction in whichA complex chemical reaction in which

Oxygen and glucose are absorbedOxygen and glucose are absorbed And then converted into energy that the And then converted into energy that the

organism usesorganism uses As well as carbon dioxide and water that As well as carbon dioxide and water that

the organisms releases back into the the organisms releases back into the atmosphereatmosphere

RespirationRespiration

When – When does respiration occur?When – When does respiration occur? ConstantlyConstantly Living things always need energyLiving things always need energy

RespirationRespiration

Why – Why is respiration so important?Why – Why is respiration so important? Gives living things energy to reproduce, Gives living things energy to reproduce,

grow, develop, adapt, and survive.grow, develop, adapt, and survive.

RespirationRespiration

How – How does respiration?How – How does respiration? A Chemical ReactionA Chemical Reaction FormulaFormula

CC66HH1212OO66 + 6O + 6O22 6CO6CO22 + 6H + 6H22O + energyO + energy

RespirationRespiration

Products:Products: EnergyEnergy

Used up by the organismUsed up by the organism Carbon Dioxide and WaterCarbon Dioxide and Water

Released into the atmosphereReleased into the atmosphere

So, What’s the Connection?So, What’s the Connection?

Why are photosynthesis and Why are photosynthesis and respiration called the respiration called the Energy Cycle?Energy Cycle?

Because…The end of one is Because…The end of one is the beginning of the other. the beginning of the other. Each relies on the other to Each relies on the other to continue and all living continue and all living things need this cycle to things need this cycle to exist. The Energy Cycle is exist. The Energy Cycle is what makes Earth unique…what makes Earth unique…the only known living the only known living planet.planet.