The correct option is A Mechanical strength onlyA. Mechanical strength only #160;Reason: In perennial woody tress, the central portion is dark, hard and toug ...

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Standard XII

Biology

Heartwood and Sapwood

Heart wood pr...

Question

Heart wood provides?

Mechanical strength only

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Facilities for storage of food materials

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Pathway for ascent of sap

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Buoyancy

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Solution

The correct option is A Mechanical strength only
A. Mechanical strength only
Reason: In perennial woody tress, the central portion is dark, hard and tough due to deposition of resins, tannins, gums and formation of tyloses. This region consists of dead elements and do not conduct water but provides mechanical support. This central region is called heartwood (duramen).

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(B) Sclerenchyma-	Mechanical strength
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(D) Phloem -	Conduction of water and minerals

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