Photosynthesis and Cellular Respiration

Photosynthesis and Cellular respiration

• Both pathways have to do with the gathering and storing of energy to sustain life in living things.

• 6CO2+ 6H2O + energy → C6H12O6+ 6O2

• C6H12O6 + 6O2 → 6CO2 + 6H2O + energy

ATP Adenosine Triphosphate

• One of the principal chemical compound that cells use to store and release energy is ATP (chemical energy)Energy stored in cells: ADP ATPEnergy released in cells: ATP ADP

• Cells generate ATP/ADP as needed by using energy in foods like glucose

ATPATP is like a charged up battery

ADP ATP

Energy

EnergyAdenosine diphosphate (ADP) + Phosphate Adenosine triphosphate (ATP)

Partiallychargedbattery

Fullychargedbattery

PHOTOSYNTHESIS

• In photosynthesis, energy is captured from sunlight by chloroplasts and is stored through the synthesis of sugar from carbon dioxide

CO2 + H2O Sugars + O2Chloroplast

Light Energy

YOUR TURN

• Copy the following equation and write it in words

• 6CO2+ 6H2O + energy → C6H12O6+ 6O2

YOUR TURN

• 6CO2+ 6H2O + energy → C6H12O6+ 6O2

• ____________ uses the energy of ____________ to convert ____________ and ____________ into high energy ____________ and ____________.

Light and Dark Reaction

• Light reaction: water molecule is split and oxygen is released

• Dark reaction (or Calvin cycle): H (from H2O) combine with CO2 to from glucose

Photosynthesis: 2 parts

• Light reaction: – happens inside the

thylakoids– Traps light energy

(with pigments) and converts it into chemical energy (ATP)

– Pigments are light absorbing molecules; main one is chlorophyll

• Dark reaction– Happens in the stroma– Uses ATP from light

reaction to produce high energy sugars

Absorption of Light byChlorophyll a and Chlorophyll b

V B G Y O R

Chlorophyll b

Chlorophyll a

Chlorophyll and light

• Chlorophyll absorbs blue and red. That is why plants are green

NOTES

• In photosynthesis, energy is captured from sunlight by chloroplasts and is stored through the synthesis of sugar from carbon dioxide

• 6CO2+ 6H2O + energy → C6H12O6+ 6O2

From Photosynthesis to Cellular Respiration

• After plants have made glucose (P/S), glucose is broken down in the mitochondria (cellular respiration) so the cell can use the energy

YOUR TURN

• What type of cells use cellular respiration?

Two Types of cellular respiration

• Aerobic (with oxygen) 36 ATP

• Anaerobic (without oxygen/”fermentation”) 2 ATP

Aerobic Respiration can broken into 3 parts

• Glycolysis- occurs in cytoplasm ,

• Krebs Cycle – occurs in mitochondria,

• Electron Transport occurs in mitochondria, produces 34 ATP’s