Active transport in plant root cells requires that those cells have access to O2. Normally there is enough O2 available
in air pockets in the soil, but flooded soil has very little O2. Thus, unless they have special adaptations, plants in flooded
soil effectively have no active transport in their roots. Which of the following should you expect to occur for trees without
special adaptations to flooding after several days in flooded soil?
a. excess uptake of water and minerals in the xylem only
b. wilting of their leaves
c. bursting of leaf cells due to excess water flow
d. excess water pushed out at the margins of their leaves only
e. excess uptake of water and minerals in the xylem, and excess water pushed out at the margins of their leaves
ANSWER: b
You might also like to view...
A stem that cannot increase in diameter is lacking what type of tissue?
A. xylem B. ground meristem C. procambium D. protoderm E. vascular cambium
Which tissue, A, B, C, or D, represents cartilage tissue?
1.A
2.B
3.C
4.D
A concentration gradient ceases to exist when
a. all the molecules have moved from high concentration to low. b. the membrane pores close. c. the temperature drops. d. there is no net movement. e. bulk flow intervenes.
Why is the phospholipid bilayer considered semipermeable?
A. The hydrophobic tails act as a barrier to nonpolar molecules. B. The bilayer is a barrier to some, but not all, substances on either side of it. C. Large molecules can only pass through the layer of hydrophilic phospholipids. D. The bilayer is completely nonpolar, which prevents some molecules from passing. E. Small, nonpolar molecules do not pass through the phospholipid bilayer.