Photosynthesis and Cellular Respiration Chapter 5 Biology

Energy in Living Systems Where does the energy in food come from?

Energy Directly or indirectly, all energy needed for the metabolism in living systems comes from the sun!

Food chains/webs

Food chains/webs

Autotrophs Autotroph = “self-feeding;” organisms that use energy from sunlight to create food Example = plants

Heterotrophs Heterotrophs = “other-feeding;” organisms that must get energy from food Examples Herbivores Carnivores Omnivores Decomposers

ATP ATP = Adenosine Triphosphate High-energy molecule; major source of energy for all cells!

Reactions Exergonic = energy is released in the reaction Endergonic = energy is absorbed

Review from yesterday… Where does all energy ultimately come from? Explain. What is the difference between ATP and ADP. Explain in writing or with a picture. Differentiate between exergonic and endergonic reactions.

Photosynthesis Photosynthesis = process by which light energy is converted to chemical energy (autotrophs/producers) 6CO2 + 6H2O  C6H12O6 + 6O2 Carbon dioxide + Water YEILDS Glucose + oxygen

Photosynthesis Pigments = light-absorbing substances Pigment molecules are found in the membrane of thylakoids.

Creative Writing Story Ideas Write a short story or dramatization. Include plot lines that follow scientific principles Include key vocabulary terms Be prepared to present your story as a group tomorrow in class.