2.40: Understand that Respiration Continues during the Day and Night, but that the Net Exchange of Carbon Dioxide and Oxygen Depends on the Intensity of Light

PLANTS

• Plants Respire during the day and night, But they can Only conduct Photosynthesis during the Day when Light is Present

PROCESS	DAY	NIGHT
RESPIRATION	✓	✓
PHOTOSYNTHESIS	✓	✗

PLANTS AND GAS EXCHANGE

• Using the Table Above, the Reactants and Products of Aerobic Respiration and Photosynthesis will Reverse Each Other

PROCESS	CARBON DIOXIDE	OXYGEN
RESPIRATION	Out	In
PHOTOSYNTHESIS	In	Out

NET GAS EXCHANGE

DURING THE DAY

Net Exchange of Gases During the Day

Respiration takes Place All the Time so Carbon Dioxide will be Taken in by Respiring Cells, and Carbon Dioxide will be Produced as a Waste Product In Daytime, Light is Present which Allows Photosynthesis to Occur, So Carbon Dioxide will be Taken In by Photosynthesizing Cells in Plants and Oxygen will be Produced as a Waste Product Oxygen is Being Both Used and Produced, and Carbon Dioxide is Being Both Used and produced, Causing the Net Exchange of Gases to be Balanced During the Day

DURING THE NIGHT

Net Exchange of Gases During the Night

Respiration takes Place All the Time so Carbon Dioxide will be Taken in by Respiring Cells, and Carbon Dioxide will be Produced as a Waste Product At Night, Light is Not Present so Photosynthesis will Not Occur, So Carbon Dioxide will Not be Taken In by Photosynthesizing Cells in Plants and Oxygen will Not be Produced as a Waste Product Oxygen Will be Used by Respiration, Carbon Dioxide will be Produced by Respiration So Net Exchange of Oxygen will have an Increased Input and Net Exchange of Carbon Dioxide will have an Increased Output