In plant cells, the turgidity and rigidity is provided by

In plant cells, turgidity and rigidity are primarily provided by vacuoles filled with cell sap. Plant cells typically contain a large central vacuole that stores water, mineral salts, sugars, and amino acids [1]. This fluid, known as cell sap, exerts hydrostatic pressure—referred to as turgor pressure—against the cell membrane and the rigid cell wall [3]. This internal pressure pushes the plasma membrane against the wall, maintaining the cell's shape and providing structural integrity to the plant tissues [3]. While other organelles like ribosomes are responsible for protein synthesis, mitochondria for cellular respiration, and the Golgi apparatus for packaging and transport [4], it is the osmotic potential and resulting turgor within the vacuole that keeps the plant upright and prevents wilting.

Sources

1. [1] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 2: The Invisible Living World: Beyond Our Naked Eye > A step further > p. 13
2. [3] https://pmc.ncbi.nlm.nih.gov/articles/PMC4204789/
3. [4] https://www.ncbi.nlm.nih.gov/books/NBK9838/