NEET Biology question
Heartwood (duramen), the central wood of an old stem, is dark coloured, and living cells are absent here. The tracheary elements are plugged by tyloses and have depositions of tannins, resins, gums, etc. Heartwood is more durable due to its little susceptibility to attack by pathogens and insects. The outer, peripheral portion of the trunk is soft and lighter in colour, performs the function of conduction of water and minerals, and is known as
Answer: (D)
Solution
The outer, soft, lighter-coloured, functional (water- and mineral-conducting) part of the secondary xylem is called sapwood or alburnum,
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