"Osmotic pressure is the minimum pressure that must be exerted to prevent the passage of pure solvent into the solution when two are separated by a semi-permeable membrane" then in concice biology in pg no. 67 in sugar concentration theory why is it written that when the photosynthesis takes place it increases the osmotic pressure WHICH DRAWS WATER FROM THE ADJOINING CELLS INTO THE GUARD CELLS DUE TO ENDOSMOSIS ? My question is osmotic pressure will prevent endosmosis then why is it written that it will draw water from the adjoining cells into the guard cells

Dear student,

This occurs due to the increased concentration of potassium ion concentration in the guard cells which makes them hypertonic so more water from the adjacent cells is drawn in.The guard cells become turgid and move outwards to open.


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