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The dead, elongated cells having lignifi...

The dead, elongated cells having lignified thick cell wall occurring in groups, with tapering ends and serving a me chanical function are called -

A

Fibres

B

Vessels

C

Tracheids

D

Collenchyma

Text Solution

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The correct Answer is:
To solve the question regarding the type of cells described, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Characteristics**: The question describes dead, elongated cells with a lignified (woody) thick cell wall, occurring in groups, having tapering ends, and serving a mechanical function. 2. **Understand the Options**: The options given are fibres, vessels, tracheids, and collenchyma. We need to analyze each option based on the characteristics provided. 3. **Analyze Each Option**: - **Fibres**: These are indeed dead, elongated cells with thick lignified walls. They are grouped together and provide mechanical support to the plant. - **Vessels**: These are also conducting elements but are not primarily for mechanical support. They are typically wider and more specialized for water transport. - **Tracheids**: Similar to vessels, tracheids are involved in water conduction but are also not primarily mechanical support cells. - **Collenchyma**: These cells are living, have unevenly thickened walls, and provide flexible support, but they do not have lignified walls. 4. **Conclusion**: Based on the analysis, the cells that fit all the criteria (dead, elongated, lignified, grouped, tapering ends, and mechanical function) are **fibres**. 5. **Final Answer**: The correct answer is **fibres**.
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