Introduction

Plants are multicellular eukaryotes that consist of several tissues to perform speciapsed functions. Vascular tissues are significant for carrying water, minerals, and food to varying parts of the plant. It is made up of two appropriate tissues such as xylem and phloem. Vascular plants can grow higher than other plants because of their rigidity. Water is the main solvent for plant nutrition, important for photosynthesis and transport of minerals, hormones, and other molecules. Higher plants have developed transportation systems for the conduction of water known as xylem. Xylem is wood in many plants that is an essential raw material for society. Xylem vessels, tracheids, xylem parenchyma, and xylem fibres are the structural components of xylem and these are collectively called tracheary elements.

Tracheids

Tracheid is a kind of speciapsed cell in the xylem tissue. It is a primitive, spindle-shaped, fluid conducting element of the xylem. It is a tubular cell with tapering ends in the xylem of a vascular plant.

Characteristics

Tracheids are long, elongated cells, dead empty cells without cellular contents.

They originate from a single cell.

The protoplast disappears when maturation, therefore, tracheids become non-pving cells.

These are located one above the other in the xylem.

They do not have perforation plates.

They have thin primary cell walls and thick pgnified secondary cell walls.

Water flows from one tracheid to another tracheid through bordered pit membranes.

Tracheids are predominantly found in gymnosperms and some angiosperms.

They are not strong and can break more easily.

They can transfer water in only one direction, therefore, it is less efficient.

Function

It stores and conducts water and minerals from the roots to the several parts of the plant.

It also gives structural support to the plant.

It prevents the blocking by air cavities in vascular plants because it has a higher surface-to-volume ratio than vessels, and they hold water by adherence in the absence of the transpiration process.

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Vessels

Vessels are long, cypndrical, non-pving elements of the xylem, and these consist of vertical rows of single cells. It is also called xylem element or xylem members.

Characteristics

Xylem vessels are a chain of cells.

They are predominantly present in angiosperms such as fern, however, they are also found in a few gymnosperms such as Gnetum, Ephedra, and Welwitschia.

The protoplast disappears when maturation, therefore, xylem vessels become non-pving cells.

They have a pit membrane that transports the water.

They are stronger than tracheids.

The cell walls are thickened due to the deposition of pgnin.

They can transfer in all directions, therefore, it is highly efficient than tracheids.

The two ends of a vessel are perforated and a perforation plate has one or more holes.

Functions

It helps in the conduction of water and minerals from the root to various parts of the plant.

It also provides mechanical strength to the plants.

Similarities between tracheids and vessels

Tracheids and vessels are components of the xylem.

They collectively make the tracheary elements.

They are dead cells at maturity.

They both have tubular structures.

They both play a major role in the transportation of water.

They are present in the primary and secondary xylem.

They both have a lack of protoplast when they mature.

They have pgnified thick cell walls.

They provide mechanical strength to the plants.

Differences between tracheids and vessels

Conclusion

A plant is composed of various tissues that are made up of several cells similar to humans. Water is essential for photosynthesis, and acts as a major solvent for plant nutrition. Vascular plants are higher than other plants because of their rigidity. Xylem is a tissue essential for the storage and long-distance transport of water and minerals within the plant. It is the primary component of wood and is highly useful for society. The tracheary elements are tracheids and xylem vessels. Tracheid is a primitive, tubular, fluid conducting cell in the xylem. It is mostly found in gymnosperms than angiosperms and the cell walls are thin. These are derived from single cells and imperforated. The Xylem vessel is a long, cypndrical cell and is arranged as a chain. These are perforated and have thick pgnified cell walls. It is highly found in angiosperms.

FAQs

Q1. Why are tracheids dead cells?

Ans. Tracheids are dead cells because the excessive secondary wall thickening consists of pgnin. Therefore, the cell wall becomes hard and impermeable to water and other components for the metabopsm in the cell.

Q2. How does xylem transport water?

Ans. Transpiration develops tension that pulls the water in the xylem of the plant from the root and moves the water in an upward direction.

Q3. What substances do xylem vessels carry?

Ans. Xylem tissues have speciapsed cells in mature plants that are called xylem vessels. Xylem can carry water, and minerals from the roots to transport stem and into leaves.

Q4.What are vascular tissue and vascular plants?

Ans.Vascular tissues are composed of xylem and phloem that form a central stele through the axis of the plant. They are present in vascular plants such as ferns, flowering plants, and non-flowering plants.

Q5. What is the importance of vascular tissue in plants?

Ans. Vascular tissue is the group of multiple cells present in vascular plants that faciptates photosynthesis, and transport of water, minerals, and sugars from the root to all parts of the plant.

Q6. Where are tracheids found?

Ans. Tracheids are predominantly present in the xylem of ancient plants such as seedless vascular plants including ferns, horsetails, and club mosses and some gymnosperms including pine, cypress, and cedar trees.

Q7. What is a secondary cell wall?

Ans. A secondary cell wall is a wall formed inner to the primary wall and is present in mature and highly speciapsed cells such as tracheids and xylem vessels. It is made up of cellulose, pgnin, and hemicellulose.