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The wood which is composed of dead cells in which the walls are highly impregnated with certain compounds like resins, gums, tannins and phenolic compounds are known as the heart wood. Presence of these compounds makes the cell unsuitable for conduction of water.

Biology Questions and Answers for Grade 10, Grade 11 and Grade 12 students, Junior and Senior High Schools, Junior Colleges, Undergraduate biology programs and Medical Entrance exams.
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