Question

What is true about heart wood
A. It does not help in water conduction.
B. It is also called alurnum.
C. It is dark in colour but very soft.
D. It has tracheary elements which are filled with tannin, resin etc.

• A. B, C and D
• B. A and D
• C. B and D
• D. A, B and C

Answer 1

Answer: (B)

A and D

With advance in age, the central axis of secondary xylem becomes inactive, losing water and stored food material. It becomes infiltrated with various organic chemicals like oil and ergastic substances (byproducts of metabolism). This region becomes hard in texture and dark in colour and is called as heart wood or duramen. This zone loses the function of conduction of nutrients. Tracheary elements have deposition of tannin, resin, etc.

Thus, the correct answer is option B.