Photosynthesis & Cellular

Respiration

http://mrescience.com/i

mages/life/chap1_2/Ph

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Photosynthesis

Photosynthesis is a chemical

reaction.

Plants use light to make their

own food.

Where does photosynthesis

occur?• Photosynthesis occurs in the

leaves of a plant.

Photosynthesis takes place in the cell

part known as the CHLOROPLAST

What is needed for

photosynthesis to

occur?

• Light is needed for photosynthesis to

occur.

• The plant’s chloroplasts use the light

to make a sugar called glucose.

Why do plants need

glucose?

• Glucose is the food for the plant. It

gives the plant energy to grow.

• Plants make enough glucose to be

used during the night and on

cloudy days when they don’t get

sunlight.

• The extra glucose is stored in the

plant’s leaves and other parts as

starch.

What happens during

photosynthesis?

Six molecules of carbon dioxide react with

six molecules of water to form 1 molecule

of glucose and six molecules of oxygen.

Photosynthesis is a chemical

reaction.

Chemical reactions can be

shown in the form of a chemical

equation.

EQUATION FOR

PHOTOSYNTHESIS

6CO2 + ENERGY C6H12O6 + 6O2

CARBON

DIOXIDE

WATER

GLUCOSE

OXYGEN

6H2O +

Name the process performed by the

elodea plant..

Identify the gas being produced by

the elodea plant.__________

Predict what would happen to the

amount of gas produced if the light

was moved further AWAY from the

plant.

Explain your prediction.

Describe Photosynthesis

• Changes light to food.

• Glucose is sugar.

• Plants need light, carbon

dioxide and water.

Photosynthesis

• The green pigment chlorophyll,

which is in the chloroplasts

captures light energy.

• The light provides energy

needed to change molecules of

carbon dioxide & water into the

sugar glucose.

Why is this important to

us?

How does photosynthesis

help us?

• During the process of

photosynthesis, oxygen is

produced. The oxygen released is

necessary for all living things.

Why is this important to us?

• We cannot make our own food

• Glucose= energy, we must get our

food from plants.

• Plants are the first step in the food

chain.

What is Cellular Respiration?

What is Cellular Respiration?

The chemical breakdown of

glucose molecules to release

stored chemical energy.

Takes place in the

mitochondria of all living

things.

• Release of energy from glucose using

oxygen.

• Takes place in the mitochondria.

AEROBIC RESPIRATION

What is the chemical equation

for cellular respiration?

EQUATION FOR

RESPIRATION

C6H12O6 +

GLUCOSE +

6O2

OXYGEN

6CO2 +

CARBON

DIOXIDE

6H2O +

USABLE

ENERGY

+ WATER +

ATP

Photosynthesis & Cellular

Respiration

Photosynthesis and Respiration are opposite equations.

Light + CO2 + H2O

C6H12O6 + O2

C6H12O6 + O2

ATP + CO2 +

H2O

Photosynthesis

• Turns _______ energy into _________

energy

Respiration

• Turns _________ energy into _______ energy

Light Chemical

Chemical usable

ENERGY PROCESSES

PHOTOSYNTHESIS CELLULAR

RESPIRATION

FERMENTATION

ENERGY

SOURCE

LIGHT GLUCOSE GLUCOSE

CELL PART CHLOROPLAST MITOCHONDRIA CYTOPLASM

REACTANTS WATER,

CARBON

DIOXIDE

GLUCOSE,

OXYGEN

GLUCOSE

PRODUCTS GLUCOSE,

OXYGEN

WATER,

CARBON

DIOXIDE,

ATP

LACTIC ACID,

ALCOHOL,

CARBON

DIOXIDE,

ENERGY

How do cells produce

energy without oxygen?

Anaerobic Respiration

YeastSome Bacteria

Tired muscle cells

Releases energy without the

use of oxygen

Anaerobic Respiration

• Tired muscle cells

•Produce lactic acid

•Which cause muscle

cramps

Anaerobic Respiration

(Fermentation)

Yeast Some Bacteria

Produce the wastes

Carbon dioxide and

Alcohol

And the useful product

ATP ( energy)

FERMENTATION

Overview of photosynthesis and respiration

PHOTOSYNTHESIS CELLACTIVITIES

RESPIRATION

SUN

RADIANT

ENERGY

GLUCOSE ATP(ENERGY)

Learn more about

photosynthesis at:

http://www.ftexploring.com/me/photosyn1.html

Read how photosynthesis &

respiration are related:

http://www.usoe.k12.ut.us/curr/science/scib

er00/8th/energy/sciber/photosyn.htm