In old trees the greater part of secondary xylem is dark brown and resistant to insect attack due to : A. secretion of secondary metabolities and their deposition in the lumen of vessels. B. depositi…

Question

In old trees the greater part of secondary xylem is dark brown and resistant to insect attack due to :
A. secretion of secondary metabolities and their deposition in the lumen of vessels.
B. deposition of organic compounds like tannins and resins in the central layers of stem.
C. deposition of suberin and aromatic substances in the outer layer of stem.
D. deposition of tannins, gum, resin and aromatic substances in the peripheral layers of stem.
E. presence of parenchyma cells, functionally active xylem elements and essential oils.
Choose the correct answer from the options given below:

Accepted Answer

Correct answer: B. (b) In old trees, 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 the stem. These substances make it hard, durable and resistant to the attacks of microorganisms and insects.

Solution

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