What does the term 'rhizoplane' refer to?

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Soil zone extending up to 5 cm from the root surfaceThe outer surface of a plant rootThe internal region inside the root structureAll of the aboveNone of the above

Explanation

The rhizoplane specifically refers to the outer surface of a plant root where microbes and soil particles often interact. It is not the soil area surrounding the root nor the internal part of the root.