Water and gas exchange in plants occurs primarily through tiny pores called stomata.
Name the specialized cells that control the opening and closing of the stomata.
Water moves through a plant in the transpiration stream, whereas sugars are transported via translocation. Describe two differences between the transpiration stream and translocation.
Which of the following environmental conditions would result in the lowest rate of transpiration in a plant?
- Cold with low humidity
- Cold with high humidity
- Warm with low humidity
- Warm with high humidity
Figure 1 shows the changes in the mean stomatal aperture of a plant species over a 24-hour period under two soil moisture conditions: well-watered soil and water-stressed (drought) conditions.
Explain how the stomatal behavior under well-watered conditions is an advantage to the plant.
Describe how the stomatal behavior under water-stressed conditions differs from well-watered conditions, and explain how this difference helps the plant survive a dry spell.