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Question

Alburnum is otherwise known as
  1. periderm
  2. sapwood
  3. heartwood
  4. bark


Solution

The correct option is B sapwood
The wood of the older stems gets differentiated into two zones, the outer light coloured and functional sapwood or alburnum which is involved in the conduction of water and minerals from root to leaf and the inner darker and nonfunctional heartwood or duramen. The heartwood is stronger and more durable than the sapwood and provides resistance to the attacks of micro-organisms and insects.

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