What factors effect the rate of transpiration?

Answer 1

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.

Answer 2

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

Answer 3

factors affecting transpiration are given below..

temperature:

light:

humidity

air circulation (wind)

soil moisture( water)

carbon dioxide concentration

Answer 4

Factors that affect the rate of transpiration include humidity (higher humidity decreases transpiration), temperature (higher temperatures increase transpiration), wind (increases transpiration by removing water vapor around the leaf), light intensity (increases transpiration by stimulating the opening of stomata), and plant surface area (larger surface area increases transpiration).

Answer 5

Light, temperature, humidity, wind, soil water

Answer 6

Light, temperature, humidity, wind, soil's water volume

Answer 7

temperature, humidity, wind speed, light intensity, and water supply