Glossopteris is a genus of extinct seed ferns found in the fossil record of the late Paleozoic and early Mesozoic eras. It is most famously associated with the Raniganj Formation, which is part of the Gondwana group of deposits.
Group I | Group II |
P. Dissepiment | 1. Echinodermata |
Q. Delthyrium | 2. Trilobita |
R. Pygidium | 3. Brachiopoda |
S. Ambulacrum | 4. Anthozoa |
The figure illustrates the soil zinc tolerance of the grass species Anthoxanthum along a transect from inside a mine to the middle of a pasture outside the mine.
\includegraphics[width=0.5\linewidth]{62a.png}
Which one or more of the following processes explain(s) the observed pattern of zinc tolerance in this grass species?