Question

The mechanical support to stem is provided by which wood

Answer 1

Answer:

I think it should be from forest wood

Answer 2

Answer:

The mechanical support to stem is provided by Heart wood.

Explanation:

• When the tree becomes old,then major of secondary xylem  gets brown.
• It is due to the deposition of  organic compound like resins,tannins,gums,oils,essential oil in theinnermost layer and aromatic substances.
• These substances make it firm,hard,tough long durable and provide resistant from attack of the moicroorganism and insects.
• This region is known as heartwood which compromises dead elements and highly lignified walls.
• So,heartwood provides mechanical support to plants.
• Sapwood conducts water for the plant and minerals from root to leaf.