1. Tardigrade
  2. Question
  3. Biology
  4. Fill in the blanks: In older trees, the greater part of (a) is dark brown due to deposition of tannins, resins, oil, guns, aromatic substances and essential oil in the central layers of the stem. These substances make it hard durable and resistant to the attacks of microorganisms and insects. This region is called (b)

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Q. Fill in the blanks:
In older trees, the greater part of (a)______ is dark brown due to deposition of tannins, resins, oil, guns, aromatic substances and essential oil in the central layers of the stem. These substances make it hard durable and resistant to the attacks of microorganisms and insects. This region is called (b)______

Anatomy of Flowering Plants

Solution:

In older trees, the greater part of secondary xylem is dark brown due to deposition of tannins, resins, oil, guns, aromatic substances and essential oil in the central layers of the stem. These substances make it hard durable and resistant to the attacks of microorganisms and insects. This region is called heartwood.