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Anatomy of Flowering Plants — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYAnatomy of Flowering Plants1 Mark
Question
Why the heartwood's colour is dark?
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Answer

The dark colour is due to the accumulation of secondary metabolites like tannins, gums, oils and resins, etc., in the wood tissue.

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