botany questions?

[Lindsey]

could anyone help me find the correct answer
and possibly a brief explanation of why;
if not, just the answer would suffice
answering any of the questions would be a great help.

1. Ignoring all other factors, what kind of day would result in the fastest delivery of water/minerals to tree leaves?
a. cool, dry day
b. warm, dry
c. warm, humid
e. very hot, windy, dry

2. If the guard cells and surrounding epidermal cells in a plant are deficient in potassium ions, all of the following would occur except
a. photosynthesis would decrease
c. phloem transport rates would decrease
d. leaf temperatures would decrease
e. stomata would be closed

3. In the pressure flow hypothesis of translocation, what causes pressure?
a. root pressure
b. osmotic uptake of water by sieve tubes at source
d. osmotic uptake of water by sieve tubes at sink
e. hydrostatic pressure in xylem vessels