NEET Biology question
Not in NEET syllabus
The osmotic potential and pressure potential of three cells (A, B, C) located in different parts of an actively transpiring plant are given below. Identify these three cells as root hair, root cortical and leaf mesophyll cells respectively.
| Cell | Osmotic Potential (MPa) | Pressure Potential (MPa) | |------|------|------| | A | −0.87 | 0.44 | | B | −0.92 | 0.34 | | C | −0.68 | 0.27 |
Solution
Water potential Ψw = Ψs + Ψp: A = −0.87+0.44 = −0.43 MPa; B = −0.92+0.34 = −0.58 MPa; C = −0.68+0.27 = −0.41 MPa. In an actively transpiring plant, water flows from soil → root hair → root cortex → xylem → leaf mesophyll → atmosphere, so water potential
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