BotanyIn older trees, the greater part of secondary xylem is dark brown due to the deposition of a. tannins and resinsb. oil and gumsc. aromatic substances and essential oil

In older trees, the greater part of secondary xylem is dark brown due to the deposition of 

a. tannins and resins

b. oil and gums

c. aromatic substances and essential oil

  1. A

    a only

  2. B

    a, b and c

  3. C

    a and c

  4. D

    c only

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    Solution:

    The greater part of secondary xylem is dark brown due to deposition of organic compounds like tannins, resins, oils, gums, aromatic substances and essential oils in the central or innermost layers of annual rings in old trees.

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