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BotanyNEET 2022Anatomy of dicot and monocot root, stem, leaf

Anatomy of Flowering Plants

In old trees the greater part of secondary xylem is dark brown and resistant to insect attack due to:

(a) secretion of secondary metabolites and their deposition in the lumen of vessels

(b) deposition of organic compounds like tannins and resins in the central layers of the stem

(c) deposition of suberin and aromatic substances in the outer layer of the stem

(d) deposition of tannins, gum, resin and aromatic substances in the peripheral layers of the stem

(e) presence of parenchyma cells, functionally active xylem elements and essential oils

Choose the correct answer from the options given below:

  1. A.(b) and (d) only
  2. B.(a) and (b) only✓
  3. C.(c) and (d) only
  4. D.(d) and (e) only

You have the answer. The worked solution — and why the other three were written — is part of a paid pack.

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From Botany › Anatomy of Flowering Plants › Anatomy of dicot and monocot root, stem, leaf — lectures, notes and every past question on it.

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