Factors affecting rate of transpiration

• The rate of transpiration varies from plant to plant and day to day.
• Environmental factors affect the rate of transpiration for example wind, heat, dry air and light all speed up the transpiration process.
• Plants that have many large leaves will lose more water than plants with fewer and smaller leaves.
• This is because water loss in plants increases where the surface area is larger.
• There are microscopic holes on the surface of plant leaves.
• These are called stomata.
• Leaves with a higher number of stomata per square centimeter (that is a higher stomata density) lose more water than leaves with fewer stomata.
• Transpiration occurs at a higher rate in plants that have not adapted to drier conditions.

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