Photosynthesis an overview 8 2 Investigating Photosynthesis photosynthesis

Photosynthesis (an overview) 8 -2

Investigating Photosynthesis § photosynthesis: the process that uses energy from sunlight to transform carbon dioxide (CO 2) and water (H 2 O) into oxygen (O 2) and carbohydrates (C 6 H 12 O 6)

The Photosynthesis Equation light 6 CO 2 + 6 H 2 O C 6 H 12 O 6 + 6 O 2 light carbon dioxide + water glucose + oxygen

Light and Pigments § Plants have pigments: light absorbing molecules that capture the sun’s energy § If the light is not absorbed, it is reflected…this is the color that we see.

Lights and Pigments § Pigments Include: § chlorophyll a § chlorophyll b § absorbs well in red and blue but poorly in green § plants also have red , yellow and orange pigments that absorb other colors § energy is transferred to electrons in pigments when they absorb sunlight

Copy the following: following Copy the following Inside a chloroplast § Photosynthesis takes place in the chloroplasts of photoautotrophs § Chloroplasts have two components: § thylakoids: saclike membranes found in chloroplasts § arranged in stacks known as grana § contain pigments that capture sunlight § stroma: gel-like matrix surrounding the thylakoids

Photosynthesis takes place in the chloroplast of photoautotrophs

The chloroplast

Reactions of photosynthesis 1. Name the two reactions of photosynthesis. 2. For each reaction: a. Name where it takes place b. List what is needed for the reaction. c. List what is produced d. Explain the importance of the reaction Found on pages 208 -213