Two ways organisms get energy from food Photosynthesis Plants ONLY! Cellular Respiration Plant AND animals

Photosynthesis

Photosynthesis Converts the sun’s energy into chemical energy stored in sugar (called glucose) Takes place in specialized structures inside plant cells called chloroplasts Chlorophyll is the pigment that absorbs sunlight.

Photosynthesis Reactants 6CO2 + 6 H2O + light energy → C6H12O6 + 6O2 Reactants Products The food plants make is called glucose (sugar) Reactants

Photosynthesis Video

Photosynthesis Song

Cellular Respiration Cells Breathing

Cellular Respiration Food (such as glucose) is broken down into carbon dioxide (CO2) and water (H2O), and energy is released The energy, ATP, supplies energy that fuels the cell’s activities Takes place in the mitochondria

Cellular Respiration C6H12O6 + 6O2 → ATP + 6CO2 + 6H2O Happens in both plant and animal cells Overall Reaction: C6H12O6 + 6O2 → ATP + 6CO2 + 6H2O Reactants Products

Reactants → Products Chemical Reactions Reactants Products What you need to make something All items to the left of the arrow Products What you make All items to the right of the arrow

Opposite Reactions! Photosynthesis 6CO2 + 6 H2O + light energy → C6H12O6 + 6O2 Cellular Respiration C6H12O6 + 6O2 → ATP + 6CO2 + 6H2O