Plant Organismal Biology
Name(s):___________________
Biology 206, Quiz 2
Multiple-multiple choice questions…
1. (1 pt) Which concentration gradient(s) drive bulk flow H2O transport in plants?
_____ S in mesophyll cells,
_____ cv xylem cells,
_____ p in root hairs,
_____ cv in and around the leaf.
2. (1 pt) Fick’s Law…
_____ …suggests that the rate of bulk flow is proportional to the radius of the tube,
_____ …suggests that the rate of bulk flow is proportional to the concentration gradient,
_____ …suggests that the rate of diffusion is proportional to the concentration gradient,
_____ …suggests that cows don’t make passes at bulls that wear glasses.
3. (1 pt) If the water potential (
(S ) is –0.6 MPa…
–0.2 MPa, and the solute potential
_____ …the pressure potential (P) is +0.6 MPa,
_____ …the pressure potential (P) is -0.8 MPa,
_____ …the cell is turgid,
_____ …the cell is plasmolyzed.
4. (1 pt) Roots…
_____ …may be sugar sources,
_____ …may be sugar sinks,
_____ …may have low phloem pressure potential (P),
_____ …may have high phloem pressure potential (P).