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Methuselah Tree  
Illuminating Photosynthesis
Intro | The Cycle | Atomic Shuffle | Three Puzzlers: 1 | 2 | 3

Puzzler 1: No

Well, if you imagined that the "tree" in the question referred to a bonsai tree, then you made the right selection—it certainly couldn't produce enough oxygen to keep a person alive. An average-sized tree, however, could produce enough oxygen to keep from two to four people alive.

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Explore the Methuselah Grove | A Tree's Secret to Living Long
Build a Tree-Ring Timeline | Illuminating Photosynthesis
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