Question 1
Which two of the following forms of soil potassium equilibrate most rapidly?
◦ nonexchangeable and solution potassium
◦ nonexchangeable and exchangeable potassium
◦ exchangeable and solution potassium
◦ exchangeable and mineral potassium
Question 2
Why do plants suffering from drought stress exhibit a larger potassium requirement?
◦ Because drought stress decreases formation of reactive oxygen species.
◦ Because increased potassium supply maintains photosynthesis.
◦ Because stomatal closure increases
fixation.
◦ Because increased potassium supply would help absorb and retain moisture in soil.
Plants
Plants
Plants
Plants
reproduction in plants
The stress response involves several pathways, which begin with a signaling stimulus