Problem:

Question 1: What factors can regulate transpiration rates?

a. Quantity and quality of light
b. Atmospheric CO2 concentrations
c. Water status of plant
d. Atmospheric O2 concentrations
e. A, B, and C

Question 2: What would happen if you stuck a stem or leaf cutting upside-down into soil substrate for propagation?

a. The roots would form on the top of the cutting instead of in the soil, and the tissues
will eventually die.
b. The xylem transports water in one direction; if inserted upside down, cuttings could
not transport water and tissues will eventually die.
c. The phloem transports water in one direction; if inserted upside down, cuttings could
not transport water and tissues will eventually die.
d. The meristems would be buried in soil and therefore couldn't grow.

Provide the correct answer and justification for your choice.