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When tree grows older,what increases rapidly in thickness

$\begin{array}{1 1}(A)\;\text{Its heart wood}\\(B)\;\text{Sap wood}\\(C)\;\text{Cortex}\\(D)\;\text{Phloem}\end{array} $

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Its heart wood.
Hence (A) is the correct answer.
answered May 7, 2014 by sreemathi.v
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