Please enable JavaScript.
Coggle requires JavaScript to display documents.
Transpiration in plants, image, image, image, By: Tomás Romero - Coggle…
Transpiration in plants
Definition
Transpiration is the process in which the excess water that the plant absorbs and doesn't use is released as water vapor through aerial parts of the plant, usually the stomata in the leaves.
Types
Cuticular
The leaves apart from having stomata that release water vapor also have a waxy cuticle located on its surface, which like stomata also releases water vapor. Keep in mind this will release less water than the stomata except when they are closed.
-
Lenticular
Lenticels which are small openings can be located in some plants' bark, these lenticels carry out transpiration but this is the type in which the plant loses the lowest amount of water.
-
Stomatal
Even though stomata only make up for 3% of a leaf's surface, it is the thing that mostly releases water, as they open to let carbon dioxide in for photosynthesis they also release water vapor which comes from the mesophyll.
-
How does it work?
In transpiration, water vapor is released from the inside to the outside of the plant. This helps the plant regulate its temperature, and to absorb water against gravity as it results in a suction force called the transpiration pull to move water through the xylem.
-
Factors that affect it
Temperature
Another factor that affects this process is temperature as a higher temperature will mean a faster evaporation rate which will increase the transpiration rate of the water molecules inside the leaf.
Wind strength
If the wind is still over time the water vapor released builds up around the leaves' surroundings which increases the moisture of the air which then leads to the humidity increasing slowing the transpiration rate, but if the air is moving it blows away the moisture around the leaf increasing its transpiration rate. But keep in mind if the wind is too strong it can lead to the stomata closing.
Humidity
Spaces inside the leaves normally contain water vapor, their transpiration rate is limited by many factors one of them being humidity because if the air is humid the water vapor will slow the transpiration rate as evaporation is limited, whereas if the air is dry it will increase the transpiration rate.
Light
Light affects the stomatal opening on the leaves, in a sunny day the opening will be wide but if there is a low level of light the opening will be much smaller then affecting its transpiration rate.
-
-
-
-
-
