Why do plant cells have cell walls?

Question

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Answer 1

Plant cells are actively involved in water transportation, and thus plant cell wall ensures that the cell does not burst due to over expansion as water flows in (internal turgor pressure). It helps to maintain the shape and osmolarity of thecells and acts as defense against pressure due to inflow of water.

Besides this cell walls also provides structural and mechanical support, protection against pathogens and dehydration.

 

Answer 2

The cell walls serve as the supportive skeletons hard boundary for plant cells. As water flows into these cells the cell expands like air moving into the a balloon. A constantly inflating balloon would eventually burst.. destroying the balloon. Imagine putting the balloon into a hard encasing cardboard box. Its prevented from bursting. That's how the cellulose containing cell wall acts a a box to prevents a plant cell from bursting and remaining rigid and strong like a well inflated balloon. Collectively all a plants rigid cells proved support like a hydrostatic skeleton for plants.