Wood Anatomy: Sapwood and Heartwood · NCERT Biology

Which substance is commonly deposited in heartwood, giving it a dark color?

  1. Cellulose and lignin
  2. Chlorophyll and carotene
  3. Tannins and resins
  4. Starch and proteins
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Correct answer: Tannins and resins

Heartwood accumulates tannins, resins, oils, and gums. These substances impart a darker color and increase durability.

Difficulty: Medium Question 5 of 20

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