photosynthesis

Capturing and Converting sunlight

PHOTOSYNTHESIS

-Photo: means “light”-synthesis: means “putting together”

Photosynthesis-using light to make food

                                                                                 

PHOTOSYNTHESIS

• Takes place in the chloroplasts in green plants (which contain chlorophyll)

• The process can be described in two steps: 1.capturing sunlight and 2.converting sunlight

STEP ONE OF PHOTOSYNTHESIS

• This occurs when energy in the form of sunlight is captured by the chlorophyll in a chloroplast

• This can only happen when the sun is shining

                                                                              

Step two of photosynthesis

• The energy that has been captured is converted into the energy found in food

• Radiant energy of sunlight is converted into chemical energy of food

• The food produced is glucose

Requirements for photosynthesis

• Sunlight• Chlorophyll• Carbon dioxide• Water

Word equation

Carbon dioxide+Water+ Sunlight Glucose+Oxygen

Chemical equation for photosynthesis

6CO2+ 6H2O+sunlight C6H12O6+ 6O2

+

Makesand

RESPIRATIONUsing the

energy in food

Autotrophs

• make their own food (green plants)

Heterotrophs

• eat green plants or other animals that eat green plants

Are you an Autotroph or a Heterotroph?

respiration• Process in which

simple food substances such as glucose are broken down and the energy they contain are released.

• Takes place in the mitochondria

Respiration• Food enters the mitochondria• Food is broken down when it

combines with oxygen• Water and carbon dioxide are

produced as waste products• Energy is stored in a chemical

compound called ATP until needed

Word equation

Glucose+OxygenCarbon Dioxide+Water+AT P

Chemical equation for respiration

C6H12O6+ 6O2 6CO2+ 6H2O+ATP

Chemical equation for photosynthesis

6CO2+ 6H2O C6H12O6+ 6O2

Chemical equation for respiration

C6H12O6+ 6O2 6CO2+ 6H2O+ATP