Problem 11
When guard cells swell, a. transpiration ceases c. stomata open b. sugars enter phloem d. root cells die
Problem 12
Stomata open in response to light when a. ions flow into guard cell cytoplasm b. ions flow out of guard cell cytoplasm c. water evaporates out of guard cells
Problem 13
In phloem, organic compounds flow through a. collenchyma cells c. vessels b. sieve elements d. tracheids
Problem 14
Sugar transport from leaves to roots occurs by a. a pressure gradient inside sieve tubes b. different solutes at source and sink regions c. the pumping force of xylem vessels d. transpiration, tension, and cohesion of water
