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Xylem fibre is...

Xylem fibre is

A

heart wood

B

wood fibre

C

libriform fibre

D

bast fibre

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Xylem Fibres**: Xylem fibres are specialized cells found in the xylem, which is a type of vascular tissue in plants responsible for the transport of water and nutrients from the roots to the rest of the plant. 2. **Identifying Characteristics**: Xylem fibres are known for their thick cell walls and are lignified, meaning they contain lignin, a complex organic polymer that provides rigidity and strength. This lignification results in the cells being dead at maturity. 3. **Function of Xylem Fibres**: The primary role of xylem fibres is to provide mechanical support to the xylem tissue and, consequently, to the entire plant. This support is crucial for maintaining the structure of the plant, especially in tall trees. 4. **Choosing the Correct Option**: The options provided are: - Hardwood - Wood fibre - Libreform fibre - Bast fibre Among these, "wood fibre" is the most accurate term for xylem fibres, as they are often referred to as wood fibres due to their presence in the woody parts of the plant. 5. **Eliminating Incorrect Options**: - **Hardwood** refers to the dense wood from trees, not specifically to xylem fibres. - **Libreform fibre** is not a standard term associated with xylem fibres. - **Bast fibre** refers to fibres derived from the phloem, which is different from xylem. 6. **Conclusion**: Therefore, the correct answer to the question "Xylem fibre is" is **wood fibre**.
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