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
Bees and Plants
Pathway for synthesis of polyunsaturated fatty acids (PUFAs) in plants and animals