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Question
When tree grows older, which of the following increase rapidly in thickness?
When tree grows older, which of the following increase rapidly in thickness?
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Solution
The correct option is A Heart wood
Heartwood is also called duramen. It is 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, when tree grows older, heartwood increases rapidly than sapwood, cortex or phloem. Thus, option A is the correct answer.
Heartwood is also called duramen. It is 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, when tree grows older, heartwood increases rapidly than sapwood, cortex or phloem. Thus, option A is the correct answer.
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