DO NOW • Why do we need light? • How does light effect our ability to live? • What would happen if the sun burned out?
Jan 02, 2016
DO NOW
• Why do we need light?
• How does light effect our ability to live?
• What would happen if the sun burned out?
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.
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.
We can only see Visible Light.
• From 400 – 700 nm• ROYGBV• Red has the longest wavelengths• Violet has the shortest
Chromatography
• What is it? – A process that is able to separate out
components. A mobile phase( Gas or a liquid) moves through the stationary phase (paper)
*Video https://www.youtube.com/watch?v=ZCzgQXGz9Tg
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?
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?
Chlorophyll
• Green pigment that aids in photosynthesis.
• Found in leaves and appears green.
• Allows plant to capture light.
Think – Pair - Share
Using the absorption spectrum of carotenoids…– What colors does
carotenoid absorb?
– What colors does it reflect?
– What color does it appear to us?
Carotenoids
• Accessory Pigment that absorbs blue and green light
• Reflects: _________
• 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?