we started off with taking some notes and learning a
little bit about pigments and light and
photosynthesis.
Light and pigments
-light travels in waves
-different colors have different wavelengths
-white light is a mixture of all colors in the visible spectrum
-a red wavelength is the longest and least energy
-purple wavelength is the shortest and most energy
-plant pigments absorb sunlight
-chlorophyll is the green pigment neede
d for photosynthesis
Photosynthesis
-the reactants are CO2, H2O, light energy
-the products are O2, C6H12O6(glucose)
-TWO reactions:
-Light reaction
-Calvin Cycle(light independent reaction)
Chloroplast structure
-Thylakoid- sacs contain chlorophyll
-Granum- stacks of thylakoids
-light reaction
-Stroma- open space
-Calvin cycle
Next in class we did a lab on UP pages 69-72 about pigments in plants. We rubbed the pigments from two different leaves of plants(spinach and red leaf) onto a piece of filter paper and let it sit in a beaker with 70% isopropyl alcohol for about 15 minutes. After the 15 minutes we observed the paper and the d
ifferent colors that showed up on the paper represented the pigments in the leaves. Here is the key for the types of pigments:
COLOR PIGMENT
Red anthocyanin
Faint Yellow carotenes
Bright Yellow xanthophyll
Yellow green chlorophyll b
Green chlorophyll a
The data my group collected was the spinach leaf had chlorophyll b, chlorophyll a, carotenes, xanthophyll in it, and the red leaf had all of those and also anthocyanin. Here are some pictures of the lab we did.
The homework for thursday night was read 8.2 and 8.3 and do either UP pages 81-85 or a reading strategy of your choice, and also finish the pigment lab and research for your national park(march 23). The homework for the weekend is to read 643 and 664-666. There is no reading strategy but we will need to know this because Ms. Stein will not be lecturing on this. I hope everyone had a great weekend!! :)
The next scribe will be.. Neal!
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