Photosynthesis in Higher Plants
Put a plant in a dark cupboard for a week and its leaves turn pale. Put it back in the light and the green returns, and the plant grows. In this chapter you find out how a leaf turns light, water and carbon dioxide into sugar and oxygen. You meet the chloroplast and its pigments, follow the electrons through the light reactions, count the turns of the Calvin cycle, and see why maize and wheat do the job differently. Python counts atoms, electrons and carbon for you.
Part of Biology · High School (11–12) (chapter 9)
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What Photosynthesis Is and Where It Happens
How did people find out that plants make their own food? Here you follow the early experiments, learn the overall reaction, and look inside the chloroplast. Then you separate the pigments of a leaf and read the absorption and action spectra.
The Light Reactions
Light is caught by two photosystems, water is split, and electrons run down a chain in a zig-zag called the Z scheme. Here you see how that run builds a proton gradient, and how the gradient makes ATP while NADPH is formed.