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  4. When a plant cell absorbs water, a pressure called pressure develops inside the cell

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Q. When a plant cell absorbs water, a pressure called ____ pressure develops inside the cell

UP CPMTUP CPMT 2015Transport in Plants

Solution:

Positive hydrostatic pressure or turgor pressure is the pressure which develops in the confined part of an osmotic system due to osmotic entry of water into it. Due to turgor pressure the protoplast of a plant cell will press the cell wall to the outside. The cell wall, being elastic, presses the protoplast with an equal and opposite force. The force exerted by the cell wall over the protoplast is called wall pressure $(WP)$. Normally wall pressure is equal and opposite to turgor pressure except when the cell becomes flaccid. The values of these two opposing forces continue to rise till the cell becomes fully swollen or turgid.