Our mission is to provide an online platform to help students to share notes in Biology. So light is the main factor, which influences transpiration. However, the rate of transpiration per unit area is more in smaller leaves than in larger leaves due to higher number of stomata in the small leaf. External or Environmental factors (eg. All the above factors are external factors related to the environment. Light affects the rate of transpiration as it is directly involved in the opening and closing of stomata. Factors Affecting the Rate of Transpiration The rate transpiration is affected by a number of environmental (external) and plant (internal) factors. There are different factors that can affect the rate of transpiration as discussed below. The external and internal factors affecting the rate of transpiration are as follows: 8,00,000+ Homework Questions. The cellular factors affecting the rate of transpiration are: The orientation of leaf, The water status of the plant, Structural Peculiarities of the leaf, Total number and distribution of stomata in a leaf. The environmental factors affecting the rate of transpiration are: Light, Humidity, Temperature, Atmospheric pressure, Wind speed or velocity. Atmospheric humidity: Increase in relative humidity decreases the rate of transpiration. This follows the simple law of diffusion. Rate of transpire varies greatly geographically and over time. External Factors These include conditions of the environment which affect the rate of transpiration. When there is water deficiency, the guard cells become flaccid and the stomata closes. 13 min. (With Methods)| Industrial Microbiology, How is Cheese Made Step by Step: Principles, Production and Process, Enzyme Production and Purification: Extraction & Separation Methods | Industrial Microbiology, Fermentation of Olives: Process, Control, Problems, Abnormalities and Developments. It is simply because of this reason that all plants show a daily periodicity of transpiration rate. Watch Factors Affecting Transpiration - External in English from Transpiration and Significance of Transpiration here. These include conditions of the environment which affect the rate of transpiration. Factors Affecting Transpiration in Plants, Factors Affecting Transpiration: 10 Factors, Factors Affecting Opening and Closing of Stomata: 4 Factors. Wind: The increase in the wind velocity increases the rate of transpiration by remouing the water … Which is the most important factor in regulation of transpiration ? The table below explains how factors increase the rate of transpiration: Plants living in different habitats have adaptations to resist extremes of these factors. The rate of transpiration is roughly inversely proportional to atmospheric humidity. Environmental Factors. View Answer. 20,000+ Learning videos. Temperature: The rate of transpiration increases with increase in temperature. Number of stomata per unit area of leaf is called stomatal frequency. Which of the following factors is the most important in the regulation of transpiration? So, the transpiration is high. Watch all CBSE Class 5 to 12 Video Lectures here. Humidity of air; Water is evaporated through the stomata. If there is little water available, the resulting tendency for dehydration of the leaf causes stomatal closure and a consequent fall in transpiration. Transpiration is inversely proportional to the relative humidity in the air. in the cells; compactly arranged mesophyll cells etc. The higher the temperature the greater the rate of transpiration since high temperature provides latent heat of vaporization and lowers the relative humidity of air. The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. The number, size, position and the movement of stomata affect rate of transpiration. Suggested Citation:"External Policies and Factors Affecting Transit Use." External factors 1. The external factors are humidity, wind, atmospheric pressure, temperature, light and water. If the loss of turgor extends to the rest of the leaf and stem, the plant wilts. Atmospheric humidity In a humid atmosphere, (when relative humidity) is high), the rate of transpiration decreases. How the vascular cambium is responsible for secondary growth? 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