Question

Duramen is?
A) Sapwood
B) Heartwood
C) Bark
D) Periderm

Answer 1

Hint: The word derives purely from the tree's location. This term shows that a tree with an absolutely decayed heart will survive.

Complete Answer:
First we should know about Duramen to answer this question.
- Secondary xylem’s central axis becomes inert, losing water and storing food content. It gets filled with complex metabolism by-products. This area becomes hard in nature and dark in colour, and is named as duramen. This zone is losing nutrient conduction function.
- Duramen is wood that has become more resistant to decay as a result of naturally produced chemical transformation. Duramen formation is a spontaneous, genetically programmed process.

Now, let us find the solution from the options-
1) The sapwood or laburnum is considered as the outer or peripheral light coloured functional secondary wood or xylem formed in dicotyledonous during secondary growth.
2) The inner or central dark coloured, non-functional secondary xylem developed in dicotyledonous stems during the secondary growth is named Heartwood or Duramen.
3) Bark is the name of tissues that exist outside the vascular cambium.
4) Cork cambium, cork, and secondary xylem are named as Periderm.

Thus, the correct answer is option (B) Heartwood.

Note: Students may confuse between sapwood and heartwood. So, students should know the central difference between sapwood and heartwood is that sapwood occurs in the wood's peripheral region while heartwood occurs in the wood's inner region.