Air bubbles that form in the xylem under high tensions are known as _____________.

Describe the driving forces for water movement for each of the following steps in the SPAC: from the bulk soil to the roots, through the xylem, and from the leaf to the atmosphere (6 points). How does xylem anatomy impact this movement? (4 points)

Pores that allow gas exchange in leaves are known as__________________. 

_________________ is an enzyme that has an affinity only for CO2. 

What body region is labeled 11?  

What body region is labeled 3?  

When carrying the microscope, which of the following numbers should be used?  Check all that apply.     

In what organ is transitional epithelial tissue found?  

Which number represents an objective lens?  

What body plane is illustrated below?