DO NOW Why do we need light?

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Presentation transcript:

DO NOW Why do we need light? How does light effect our ability to live? What would happen if the sun burned out?

Photosynthesis Section 8.2

Today’s Objectives To understand the different types of light and their wavelengths. To be able to explain how pigments enable us to see different colors. To determine the role of light and pigments in photosynthesis.

What is light? WAVES Energy!!! Travels in The distance between 2 crests is a wavelength. WAVES

Wavelengths There are different wavelengths for each type of light.

Visible Light The light we see is called visible light. ROYGBIV…

Which color has… The shortest wavelength? The longest wavelength? What is wavelength measured in?

Why do we see COLORS? The color you see is the color being reflected. *All other colors are being absorbed.

Soooo… Why do plants appear to be green? Why is the sky blue?

Pigments Chemical compound that gives a substance it’s color They can absorb certain wavelengths Pigments are everywhere (clothes, flowers, etc.) Ex: Chlorophyll, Carotenoids. Why do you think pigments are necessary for photosynthesis?

Chlorophyll Green pigment that aids in photosynthesis. Found in leaves and appears green. Allows plant to capture light.

Think- Pair- Share Use the absorption spectrum for chlorophyll… What colors does chlorophyll absorb? What colors does it reflect? What color does it appear to us?

Carotenoids Orange pigment found in most leaves. Usually hidden by chlorophyll.

Review! What type of light do we see? What is a pigment? What are the names of the pigments in leaves? Why are pigments important in photosynthesis?

Photosynthesis Video http://video.google.com/videoplay?docid=- 3537053342610184162&ei=PehmS6uzD5mY qwLjn929CA&q=light+and+pigment+in+pho tosynthesis&hl=en&view=3#docid=- 7377788683046188633

Do Now What does a plant need to live? How do plants help US live?