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Fill in the blanks: In older trees , t...

Fill in the blanks:
In older trees , the greater part of …a…. Is dark brown due to deposition of tannins, resins, oil, guns, aromatic substanceces 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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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 ...

Statement-1 : The heart wood is more durable and resistant to the attack of the micro organisms and insects as compared to the sap wood. Statement-2: The heart wood contain organic compounds like oils , aromatic substance , gums, resin, tannins and phenols etc.