PEQ_2 - Ψ p = 0.9 MPa in all cases Note that oak has a...

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Biology 152: Practice exam problem on plant water relations Spring 2009 Early in the morning (i.e., just before dawn), stomates are closed, relative humidity is high, and leaves are not transpiring. Thus, the water potential ( Ψ ) of plant foliage is generally assumed to be in equilibrium with that of the soil at this time of day. Based on the soil data below, what would the water potential ( Ψ ) and osmotic (or solute) potential (( Ψ s ) of leaf mesophyll cells be in each species (given that mesophyll
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Unformatted text preview: Ψ p = 0.9 MPa in all cases). Note that oak has a taproot that accesses the water table at a depth exceeding 100 cm . In which of these situations is the assumed equilibrium between leaf and soil water potential least likely? Why? Corn on Potato on Oak on glacial till, Loamy soil: outwash sand: 0-100 cm depth: Ψ p = -0.5 MPa Ψ p = -1.8 MPa Ψ p = -1.1 MPa Ψ s = -0.3 MPa Ψ s = -0.1 MPa Ψ s = -0.2 MPa >100 cm depth: Ψ p = -0.3 MPa Ψ s = -0.1 MPa...
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