Question

As the secondary growth takes place (proceeds) in a tree, thickness of

• A. Heart wood increases
• B. Sap-wood increases
• C. Both increase
• D. Both remain the same

Answer 1

The correct option is A Heart wood increases

In old dicotyledonous stems, during secondary growth, secondary xylem is differentiated into an outer light coloured functional secondary xylem called as sapwood or alburnum and inner or central dark coloured non-functional wood called as heartwood or duramen. Every sap wood gradually converted into heart wood. Due to this, the thickness of heart wood increases.

So, the correct option is ‘Heartwood increases’.