Sclerenchyma
Dead, thick-walled, lignified cells providing mechanical support and protection, includes fibres and sclereids.
What is Sclerenchyma?
The process by which cell walls become thickened and hardened due to the deposition of lignin, a complex polymer.
Key points
- Identify the structural characteristics of sclerenchyma cells.
- Differentiate between fibres and sclereids.
- Explain the function of sclerenchyma in plants.
- Locate sclerenchyma in different plant organs.
Common exam trap
Confusing sclerenchyma with collenchyma (which has living cells and unevenly thickened walls).
Definitions
- Term
Lignification
- Meaning
The process by which cell walls become thickened and hardened due to the deposition of lignin, a complex polymer.
- Term
Sclereids
- Meaning
A type of sclerenchyma cell that is variable in shape, often isodiametric, and found in specific regions like seed coats and fruit pulp.
- Term
Fibres
- Meaning
A type of sclerenchyma cell that is elongated, slender, and typically has pointed ends, often occurring in bundles.
Learning objectives
Identify the structural characteristics of sclerenchyma cells.
Differentiate between fibres and sclereids.
Explain the function of sclerenchyma in plants.
Locate sclerenchyma in different plant organs.
Prerequisites
Basic plant cell structure (cell wall, cytoplasm, lumen).
Understanding of plant tissues (permanent tissues, simple tissues).
Common mistakes
Confusing sclerenchyma with collenchyma (which has living cells and unevenly thickened walls).
Forgetting that sclerenchyma cells are dead at maturity.
Not distinguishing between fibres and sclereids.
Keywords
Sclerenchyma
Plant Tissue
Mechanical Support
Lignified Walls
Dead Cells
Fibres
Sclereids
Plant Anatomy
Practice preview
Consider the following statements regarding sclerenchyma: (A) Sclerenchyma cells have protoplasm at maturity. (B) Sclerenchyma provides mechanical support. (C) Sclerenchyma cell walls are lignified. (D) Sclerenchyma is a…
hard
Which of the following is a characteristic feature of sclerenchyma tissue?…
easy
Sclereids, a type of sclerenchyma, are characterized by:…
medium