Humidity - increased humidity decreases transpiration, as the air is already saturated with water, and so the water potential gradient is smaller, and so less water is lost by transpiration.
Temperature - increased temperature increases transpiration as the water has a greater kinetic energy and so there is more evaporation of water.
Wind/air movement - in still air, a shell of highly saturated air surrounds the air, decreasing the water potential gradient and decreasing transpiration rate, but wind destroys this shell of saturated air so there is a bigger water potential gradient, amd more transpiration.
Light intensity - light is needed for the stomata to open - they do not open at night time (unless the plants are xeromorphically adapted desert plants or plants living in other harsh environments such as salt marshes).
Internal factors that affect transpiration are the number of stomata, leaf area, the cuticle (thick waxy cuticles prevent water loss, whilst thinner and less waxy cuticles allow more water to be lost. Distribution of stomata also affects transpiration - most plants have most of the stomata on the lower surface of the leaf where the stomata are less exposed to environmental conditions.
Transpiration rate has been shown to be affected by a range of external factors: Light, Temperature, Humidity, Wind and Soil Water. Stomata usually open in the light and close in the dark, which means light is necessary as open stomata are necessary for gas exchange and result in the escape of water vapour from the plant.
An increase in temperature increases the rate of transpiration which causes the guard cells to become straighter. If this happens, CO2 supply is restricted to what is produced by respiration and therefore there is no growth.
A humidity increase causes a decrease in transpiration and this is due to a decreased diffusion gradient between the intercellular spaces and the atmosphere, which reduces evaporation.
Wind increases transpiration by the removal of water vapour around the stomatal pore and if the supply of soil water is reduced, uptake decreases and the transpiration rate falls as a result
factors affecting transpiration are given below..
temperature:
light:
humidity
air circulation (wind)
soil moisture( water)
carbon dioxide concentration
Light, temperature, humidity, wind, soil water
Light, temperature, humidity, wind, soil's water volume
temperature, humidity, wind speed, light intensity, and water supply
*stomata -open-increased transpiration -closed-decreased transpiration *consequence of gas exchange -tradeoff of more gas exchange resulting in more transpiration *environmental factors -humidity -air movement -evaporative cooling -wind stress -intense light/heat
They increase surface area . They create a covering with air. It reduces transpiration rate
How does humidity affect the rate of transpiration
The rate of transpiration depends on some environmental factors such asTemperature and windWhen the temperature is high rate of evaporation increases as warm air can hold more water vapours than the cold air. Windy condition also increase the rate of transpiration as wind remove water vapours from around the leaf. HumidityWhen there is more humidity in air, transpiration would be considerably low as the air is already saturated with water vapours and it will be unable to absorb more water so little water will diffuse out of the leaves. LightLight greatly influences the opening and closing of stomata. During day light the stomata remain open and allow water vapours from the leaves to diffuse into the atmosphere. Atmospheric pressureReduction in the atmospheric pressure enhances the rate of transpiration.
The stomata on the underside of the leaf regulate transpiration. The leaf surface area helps to estimate the number of stomata, which could speed up or slow the rate of transpiration.
*stomata -open-increased transpiration -closed-decreased transpiration *consequence of gas exchange -tradeoff of more gas exchange resulting in more transpiration *environmental factors -humidity -air movement -evaporative cooling -wind stress -intense light/heat
Increase in temperature also increases the rate of evaporation of water, hence temperature will effect transpiration
Heat and wind.
By transpiration. Water molecules pass out of the leaf by diffusion following the concentration gradient from higher concentration to lower concentration. The rate of transpiration varies. Factors that affect the rate of transpiration includes wind speed, light intensity, temperature and humidity
The rate of transpiration is the position of air bubble
Because there is no consistancy in the rate of transpiration
Hard to answer because transpiration rate is affected by many factors.This is from wikipediaThe rate of transpiration is directly related to the degree of stomatal opening, and to the evaporative demand of the atmosphere surrounding the leaf. The amount of water lost by a plant depends on its size, along with the surrounding light intensity, temperature, humidity, and wind speed (all of which influence evaporative demand). Soil water supply and soil temperature can influence stomatal opening, and thus transpiration rate.Maybe you mean what is a definition of transpiration rate?Transpiration rate i.e. the rate at which water is lost by a plant. Water can be lost from various parts of plants especially leaves but also stems, flowers and roots.
High humidity reduces the rate of transpiration.
Compare the rate of transpiration from two surfaces of leaf and give reasons?"
Transpiration it the biological process of the movement of water from roots to stoma through plants. it is not made of metal as it is not a physical entity in itself. Acid rain would probably eat away at things made of metal, and it affects transpiration because it increases the hydrogen ions in the xylem, which increases the cohesion and the rate of transpiration.
Phillip Unterschuetz has written: 'The effect of internal and external moisture stress on the transpiration rate of Douglas-fir seedlings (Pseudotsuga menziesii (Mirb.) Franco)' -- subject(s): Plants, Douglas fir, Transpiration
Bigger the SA:V ratio , transpiration sucks.