Question

In which of the following, there is no differentiation of heart wood and sap wood?

• A. Neem
• B. Ashok
• C. Mango
• D. Palm

Answer 1

The correct option is D Palm

Heart wood and sap wood are the result of sufficient activity of vascular cambium. Heart wood is the central region of old trees, that is formed earlier during secondary growth, with tannins, resin and other substances imparting it the black color. It serves to provide mechanical support. Sap wood in outer region of recently formed wood which is lighter in color. Vascular cambium is a lateral cambium which is produced by primary permanent tissues and divides to produce secondary tissues during secondary growth which in turn increase the girth of the plants. Monocots do not produce lateral cambium and hence lack secondary growth which means that heart wood and sap wood are not produced. Among the given options, palm is a monocot which does not produce secondary wood and rest three plants are dicots that exhibit secondary growth to produce secondary tissues.
Therefore, the correct answer is option D.