Energy Flow- Photosynthesis & Cellular

RespirationFocus Question:

• Where do plants and animals get their energy from?

Energy Flow• Radiant energy is

energy that comes from the Sun

• Light energy is seen by humans; it’s absorbed by plants in the chlorophyll and converted into chemical energy during photosynthesis.

0.023% absorbed by plants

Energy Flow• Chemical energy is

the energy stored in the bonds of compounds and molecules.

0.023% absorbed by plants

Producers and Consumers

• Producers (green plants) create glucose or chemical energy from light energy. They do not need to consume other organisms to get energy.

• Consumers are organisms which need to eat (consume) other organisms to get their energy. They cannot perform photosynthesis.

Photosynthesis• Producers perform photosynthesis to create high-energy

sugars (glucose), which the plant then uses or stores.

Photosynthesis• Write the word equation for photosynthesis.

carbon dioxide + water glucose + oxygen

• Write the chemical equation for photosynthesis.

CO2 + H2O C6H12O6 + O2

sunlight

chlorophyll

sunlight

chlorophyll

Try This• Try holding your breath for as long as you can.

• Why do you feel you need to breathe after a while?

Cellular Respiration• Cellular respiration occurs in the cells of producers and

consumers, releasing energy stored in glucose.

• By breaking the bonds in glucose, the chemical energy that was stored in them is released, making it available to be used.

Cellular Respiration• Write the word equation for cellular respiration.

glucose + oxygen carbon dioxide + water + ENERGY

• Write the chemical equation for cellular respiration.

C6H12O6 + O2 CO2 + H2O + ENERGY

The Reactions

How are the processes related?

How are they related?

Complementary Processes

• Cellular respiration and photosynthesis are complementary processes because the products of one reaction are the reactants of the other reaction.

• ie. CO2 and H2O are produced in cellular respiration and needed for photosynthesis to occur.