Sclerenchyma: Plant Hardness and Stiffness
The permanent plant tissue responsible for making a plant hard and stiff is Sclerenchyma.
Why Sclerenchyma?
- Sclerenchyma tissue consists of cells with highly thickened, lignified secondary walls. Lignin is a complex polymer that makes cell walls rigid and impermeable.
- These strong, rigid cells provide significant mechanical support, contributing to the hardness and stiffness of plant parts like stems, seed coats, and nutshells.
- Mature sclerenchyma cells are often dead, offering structural support without metabolic demands.
Other Tissue Functions:
- Collenchyma provides flexible support, mainly to growing stems and leaves, due to unevenly thickened primary walls.
- Parenchyma is involved in photosynthesis, storage, and secretion, having thin primary walls.
- Aerenchyma is a specialized parenchyma that facilitates aeration in aquatic plants.
Therefore, sclerenchyma is the specific tissue that imparts hardness and stiffness.
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Important Questions from Tissue
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