DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
Roots of the annual meadow-grass, Poa annua. The pictures shows the roots of grass that has grown in the confined space of a seed tray. Unable to penetrate widely into natural soil, the roots have grown in parallel clusters resembling a cable network. The roots show a striking lack of lateral root formation under these conditions.
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