Simple Permanent Tissues Lignified Walls
The question asks to identify the simple permanent tissue characterized by lignified cell walls. Lignification is the process where secondary cell walls become hardened due to the deposition of lignin, a complex polymer.
Sclerenchyma Tissue Characteristics
- Sclerenchyma is a type of simple permanent tissue in plants.
- Its cells typically have thick, rigid, and lignified secondary walls.
- These thickened walls provide mechanical strength and support to the plant.
- Sclerenchyma cells are often dead at maturity.
- Examples include fibers and sclereids.
Analysis of Other Options
- Parenchyma cells have thin, living primary walls and are involved in storage and photosynthesis. Their walls are not lignified.
- Collenchyma cells have unevenly thickened primary walls and provide flexible support. Their walls are generally not lignified, although they may thicken.
- Phloem is a complex permanent tissue responsible for transporting sugars. While it contains phloem fibers (which are lignified sclerenchyma cells), phloem itself is not a simple tissue, and not all its constituent cells have lignified walls.
Therefore, sclerenchyma is the simple permanent tissue known for its lignified cell walls.
Important Questions from Botany
One advantage of sexual reproduction over asexual reproduction is that it helps species to survive over long evolutionary time. This is because sexual reproduction produces :
During a laboratory experiment, a student immerses epidermal leaf peel in a hypertonic solution. After some time, the student examined the cells under a microscope and observed that:
The breakdown of glucose in cytoplasm results in the formation of
After fertilization, the fruit and the seed are produced by
- Which one of the following groups is called 'amphibians of plant kingdom'?
