8.2 – Photosynthesis: An Overview

8.2 ? Photosynthesis: An Overview

Guided Reading

Chlorophyll and Chloroplasts

Light How does the energy from the sun

travel? As light

What is "white" light actually made up of? Mixture of different wavelengths that we see as different colors

Pigments How do photosynthetic organisms

capture light? With pigments

What are pigments? Molecules that absorb light

What is the primary (principle) pigment in plants? Chlorophyll

What colors of light does chlorophyll absorb? Red and blue-violet

 Why do plants look green? They reflect green light, while absorbing all other colors

What is carotene? A pigment that reflects red/orange light

What causes the different colored leaves in the fall? In the decreased temps, chlorophyll breaks down before the other pigments do, leaving the carotene to give off red/orange light

Chloroplasts Where does photosynthesis take place? On

chloroplasts

What are thylakoids? Saclike photosynthetic membranes

What are grana made up of? Interconnected stacks of thylakoids

Where is chlorophyll found in the chloroplasts? In the membrane of the thylakoids

The fluid portion of the chlorplasts is called the stroma

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