Chapter 4.pdf
18 pages
Leaf cross-section.png
Quiz on Friday
Which pigment is made fresh each autumn?
Before Friday
Read chapter 4
Draw the leaf
Quiz myself
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Why do leaves change color?
Chlorophyll breaks down as the days get shorter. The yellows and oranges, carotenoids, were in the leaf all along.
Reds are different. Anthocyanins are made fresh each autumn, from sugars trapped in the leaf.
See the cross-section sketch →
Quiz on Friday
Three pigments: chlorophyll, carotenoids, anthocyanins. Which one is made in autumn?
Draw it out
Map how sunlight, water and CO₂ move through a single leaf.
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Why do leaves change color?
Chlorophyll breaks down as the days get shorter. The yellows were there all along.
PNG or JPEG
Draw it out
Sunlight, water and CO₂ through one leaf.
Quiz on Friday
Which pigment is made in autumn?
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Photosynthesisen.wikipedia.org
Light and colornasa.gov
1:32
Mitosis in 90 seconds
Biology
12 items
Open question
Why do some trees stay green all winter?
Before Friday
Read chapter 4
Draw the leaf
Quiz myself
1 · Outline
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Brief.pdf
4 pages
Slide templatekeynote.app
Stairs, looking up
Brooklyn Bridge
Sea from the cliff
2:14
Light reactions explained
Color palettescoolors.co
Why I keep it
The light in that one photo.
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Why do leaves change color?
Chlorophyll breaks down as the days get shorter. The yellows and oranges, carotenoids, were in the leaf all along.
Three pigments
Reds are different. Anthocyanins are made fresh each autumn, from sugars trapped in the leaf as the veins close off.
A cold, sunny week makes the reds brighter. A warm, wet one dulls them.
Reds are different. Anthocyanins are made fresh each autumn, from sugars trapped in the leaf.
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