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Get Answers to all your Questions
- #Structural Organisation in Animals and Plants
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Heartwood is
Option: 1
Durable wood
Option: 2
Used for making furniture
Option: 3
Efficient in conducting the sap
Option: 4
Only a and b
Answers (1)
- When a transverse section of a woody trunk is taken, two regions are distinctly visible.
- In the centre, there is dark coloured wood called heartwood.
- Heartwood is made up of dead and non-functional components of wood.
- Heartwood is also called duramen.
- The lumen of vessels in the heartwood has been blocked by tyloses.
- Tyloses are balloon-like structures formed due to protrusion of xylem parenchyma cells into the lumen of vessels.
- These parenchyma cells become lignified and dead, thereby making the vessels non-functional.
- In the tracheids of gymnosperms, the tylosoids are present.
- The heartwood is durable and resistant to parasitic and microbial attack.
- It gives mechanical support to the tree trunk.
Heartwood does not perform the conduction of water and minerals.
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