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Understanding Transpiration: Factors Affecting Rate

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Nima K

11/07/2022

Biology

Biology Paper 2- Rate of Transpiration

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Biology

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Organisation

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Plant organisation

Understanding Transpiration: Factors Affecting Rate

Factors Affecting Rate of Transpiration in Plants: A comprehensive guide exploring how environmental conditions influence plant water movement and transpiration rates.

• Light intensity directly impacts rate of transpiration through photosynthesis regulation and stomatal opening
• Temperature affects water particle energy and evaporation rates
• Humidity levels influence the water vapor concentration gradient
• Air movement impacts the dispersal of water molecules and concentration gradients
• All factors work together to control overall transpiration efficiency

...

11/07/2022

770

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Subjects

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Organisation

Plant organisation

 

Biology

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770

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11 Jul 2022

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Understanding Transpiration: Factors Affecting Rate

user profile picture

Nima K

@nspidka480

Factors Affecting Rate of Transpiration in Plants: A comprehensive guide exploring how environmental conditions influence plant water movement and transpiration rates.

• Light intensity directly impacts rate of transpiration through photosynthesis regulation and stomatal opening
• Temperature affects water... Show more

<h3 id="lightintensity">Light Intensity</h3> <p>According to the Biology Edexcel specification, the rate of transpiration is affected by li

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Page 1: Environmental Factors Affecting Transpiration

This page details the four main environmental factors that affect the rate of transpiration in plants: light intensity, temperature, humidity, and air flow. Each factor is explained in detail with its specific impact on the transpiration process.

Definition: Transpiration is the process of water movement through plants and its evaporation from aerial parts, especially leaves.

Light Intensity:

  • Brighter light conditions increase photosynthesis rates, leading to more open stomata
  • More open stomata allow greater water evaporation, increasing transpiration
  • During darkness, stomata close and transpiration reduces significantly

Highlight: The relationship between light intensity and transpiration is directly proportional - more light typically means higher transpiration rates.

Temperature:

  • Higher temperatures increase water particle energy
  • Enhanced particle energy leads to more rapid evaporation and diffusion through stomata

Example: Just as warm air helps clothes dry faster on a clothesline, warmer temperatures accelerate water evaporation from leaves.

Humidity:

  • Higher humidity decreases transpiration rates due to reduced concentration gradients
  • Lower humidity promotes faster transpiration through steeper concentration gradients

Vocabulary: Concentration gradient refers to the difference in water vapor concentration between the inside and outside of the leaf.

Air Flow:

  • Wind removes water vapor from leaf surfaces
  • Increased air movement maintains steep concentration gradients
  • Higher wind speeds generally result in increased transpiration rates

Quote: "Water molecules that leave the leaf are quickly blown away" in windy conditions, maintaining a high concentration gradient.

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