Question

Define the structure of tracheids.
Mention 5 points.​

Answer 1

• Tracheid, in botany, primitive element of xylem , consisting of a single elongated cell with pointed ends and a secondary, cellulosic wall thickened with lignin containing numerous pits .
• At functional maturity, the cell is dead and empty; its former protoplast is represented, if at all, by a warty layer on the wall.
• Tracheids serve for support and for upward conduction of water and dissolved minerals in all vascular plants and are the only such elements in conifers and ferns.
• Tracheid cells are tube-like with tapering ends. The average length is 5 to 6 mm.
• In general, each of the pits has a complimentary pit on the neighboring tracheid cell.

Answer 2

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✦ Here is a brief introduction first of all.

The tracheids are one of the essential conducting, most prominently water conducting pipe like structure and are part of xylem. The complex permanent tissue are made up of two or more cells, which work as unit. The complex permanent tissues are xylem and phloem and these are also known as Conducting or Vascular tissues.

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The complex tissue that is meant for the conduction of sap i.e. water and minerals throughout the plant and they also provides mechanical support. The xylem is also known as wood. They works unidirectional. It means from roots to all other parts. They consists of mainly 4 different types of cells:

• Trachieds
• Vessels
• Xylem parenchyma
• Xylem Fibres.

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The trachieds are one of elements or transporting tissue of xylem. The structure and anatomy of tracheids:

♠️ Refer to the attachment....

• They are elongated, tubular, dead cells and narrow pipe like structure with blunt ends.
• They are having hard signifies walls and they have a wide lumen.
• Some of the unthickened areas called pits are there which are present for the movement of sap from one cell to another.
• The tracheids are the chief conducting in non flowering plants because vessels are not present in flowering plants.
• As they are plant cells, they have cell walls. This provides mechanical support to the plant.

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