I. It is resistant to microorganismsII. It co | vedclass

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(B) The correct answer is $IV$.Heartwood is the central,innermost part of the secondary xylem in old trees. It is dark brown due to the deposition of

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Only $IV$

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(B) The correct answer is $IV$.Heartwood is the central,innermost part of the secondary xylem in old trees. It is dark brown due to the deposition of organic compounds like tannins,resins,oils,gums,aromatic substances,and essential oils. These substances make it hard,durable,and resistant to the attacks of microorganisms and insects. It consists of dead elements with highly lignified cell walls. In contrast,the peripheral part of the secondary xylem is known as sapwood,which is lighter in color and involved in the conduction of water and minerals. Therefore,statement $IV$ (It is the peripheral part) does not describe heartwood.

$I.$ It is resistant to microorganisms
$II.$ It comprises dead elements
$III.$ It comprises highly lignified cell wall
$IV.$ It is the peripheral part
$V.$ It is dark and tough
Which of the above property does not belong to heartwood?

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$I.$ It is resistant to microorganisms$II.$ It comprises dead elements$III.$ It comprises highly lignified cell wall$IV.$ It is the peripheral part$V.$ It is dark and toughWhich of the above property does not belong to heartwood?