botany help??

[Lindsey]

I know it looks like a lot, but all I really only need the letter of the answer so I can further research and explain for myself;

answering any of these questions would be a great help

1What process is the source of the CO2 that root hairs release into the soil?
a. photosynthesis
b. cellular respiration
c. photolysis
e. mycorrhizae

2Which is the following is not a function of the plasma membrane proton pump?
a. hydrolyzes ATP
b. produces a proton gradient
c. generates a membrane potential
d. equalizes the charge on each side of a membrane

3Which of the following would likely not contribute to the surface area available for water absorption from the soil by a plant root system?
a. root hairs
b. endodermis
c. mycorrhizae
e. fibrous arrangement of the roots

4Guard cells do which of the following?
a. protect the endodermis
c. contain chloroplasts that import K+ directly into cells
d. guard against mineral olss through stomata
e. help balance the photosyntesis-transpiration compromise