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

2. Photosynthesis
Section 8.2

3. 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.

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

5. Wavelengths
There are different wavelengths for each type of light.

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

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

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

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

10. We can only see Visible Light.
From 400 – 700 nm
ROYGBV
Red has the longest wavelengths
Violet has the shortest

11. Pigments What are they? Chlorophyll (A and B) Carotenoids Xanthophylls
Carotene

12. 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

13. 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?

14. 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?

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

16. 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?

17. Carotenoids Accessory Pigment that absorbs blue and green light
Reflects: _________
Usually hidden by chlorophyll.

18. 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?

19. Do Now 1. What colors does this pigment absorb?
2. What colors does it reflect?
3. What color does it appear to us?
4. What pigment do
you think it is?