Assertion :The heart wood is more durable and resistant to the attack of the micro organisms and insects as compared to the sap wood. Reason: The heart wood contains organic compounds like oils, aromatic substance, gums, resin, tannins and phenol etc.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Heartwood, also called as duramen, dead, central wood of trees. Its cells usually contain tannins or other substances that make it dark in colour and sometimes aromatic. Heartwood is mechanically strong, resistant to decay, and less easily penetrated by wood preservative chemicals than other types of wood. One or more layers of living and functional sapwood cells are periodically converted to heartwood. So, heart wood is more durable and resistant to the attack of the micro organisms and insects as compared to the sap wood. This is because heart wood contains organic compounds like oils, aromatic substance, gums, resin, tannins and phenol etc.
Therefore, the correct answer is option A.

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Q. Assertion :The heart wood is more durable and resistant to the attack of the microorganisms and insects as compared to the sap wood. Reason: The heart wood contains organic compounds, like oils, aromatic substances, gums, resin, tannins and phenol etc.

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