Question

In an old tree trunk the major part of wood is filled with tannins, resins, gums etc. This region is known as

• A. early wood
• B. late wood
• C. heartwood
• D. sapwood

Answer 1

The correct option is C heartwood

Heart wood is dark brown due to deposition of organic compounds like tannins, resins, oils, gums, aromatic substances and essential oils. These make it hard, durable and resistant to the attacks of insects. This region comprises of dead elements with lignified walls.
The peripheral region of the tree trunk is lighter in colour and is known as sapwood. This region is involved in the conduciton of water and minerals from root to leaves.