Discussion
Which one of the following is not a gross physical feature of wood ?
Answer: D
The key's answer is hardness.
The gross (general) features of wood used for identification are those seen or sensed without magnification: colour, odour, lustre, texture, grain, figure and weight. They are judged by eye, nose and hand on a freshly cut surface.
Hardness, the resistance of wood to indentation, is a mechanical property measured by testing (for example the Janka test), so it is the one not counted among the gross physical features.
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