Neco Model Questions Vol1 2018 Biology Question 20
Practice objective / multiple choice question 20 from the 2018 Neco Model Questions Vol1 Biology examination.
In a plant the water potential in the leaf (\(\Psi_{\text{leaf}}\)) is -0.85 MPa and in the root (\(\Psi_{\text{root}}\)) is -0.15 MPa. The plant transpires water at a rate of \(5 \times 10^{-6}\ \text{m}^{3}\,\text{s}^{-1}\). The hydraulic conductivity of the xylem (\(L\)) is \(1.2 \times 10^{-7}\ \text{m}^{3}\,\text{s}^{-1}\,\text{MPa}^{-1}\). (i) Calculate the pressure gradient \(\Delta\Psi = \Psi_{\text{root}} - \Psi_{\text{leaf}}\) required to sustain the observed transpiration rate. (ii) State whether the given conductivity is sufficient to provide this gradient (yes/no). Provide the required gradient in MPa (to one decimal place) and the adequacy answer.
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This is Neco Model Questions Vol1 2018 Biology Question 20. It is one of the objective questions from the 2018 Neco Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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