PHOTOSYNTHESIS

Getting energy to live  Heterotrophs must consume organic molecules for energy.  Cellular respiration.  Autotrophs produce their own food molecules  Photosynthesis  Cellular respiration Autotroph Baby heterotroph!

Capturing the Energy in Light  Photosynthesis is an example of a biochemical pathway.  Captures light energy.  Stores energy in form of chemical bonds.  Chemical bonds are in organic compounds. Pair share: name 2 organic compounds.

Light Absorption in Chloroplasts  Chloroplasts are the structures that capture light.  Photosynthesis Reactions takes place in the chloroplasts.  Chloroplasts were once free living. (Pair share: just like…) Structure of a Chloroplast

Chloroplast structure  Chloroplasts are composed of:  Double membrane.  Thylakoids.  Grana  Stroma Structure of a Chloroplast

Energy For Life Processes  Photosynthesis  Raw materials are water and carbon dioxide.  Products are glucose and oxygen.  Energy source is sunlight. Pair share: What does this chemical reaction remind you of?

A series of biochemical pathways  There are 2 main biochemical pathways  light dependent  Uses electrons “excited” by sunlight for energy  has 2 phases: photosystems 1 & 2  Takes place in thylakoid  light independent (Calvin cycle).  Uses ATP & NADPH for energy to make glucose  Takes place in the stroma Diagram of the phases of photosynthesis

Cyclical processes  Photosynthesis and cellular respiration form a cycle.  Carbon dioxide & water  Oxygen & glucose  Heterotrophs  Autotrophs Photosynthesis - respiration cycle whiteboard: explain why this is a cycle.

White board Review 1.What is the equation for photosynthesis? 2.Where in the cell does photosynthesis take place? 3.What are the 2 main stages of photosynthesis?