The stoma opens and transpiration occurs. help in reducing the rate of transpiration. Type # A. of epidermal cells in same unit area. External Factors Affecting The Rate of Transpiration Light. E = No. Factors Affecting Transpiration in Plants, Factors Affecting Transpiration: 10 Factors, Factors Affecting Opening and Closing of Stomata: 4 Factors. Light: By know it is known that transpiration takes place from the stomata which is present on the leaf which is only open during day. The velocity of wind greatly affects the rate of transpiration. These include conditions of the environment which affect the rate of transpiration. 8,00,000+ Homework Questions. 8. Watch Factors Affecting Transpiration - External in English from Transpiration and Significance of Transpiration here. SignUp for free. Many environmental factors, such as intensity of light, temperature, atmospheric humidity, wind, availability of soil water, etc., greatly affect the rate of transpiration. This follows the simple law of diffusion. Many environmental factors, such as intensity of light, temperature, atmospheric humidity, wind, availability of soil water, etc., greatly affect the rate of transpiration. Bright light is the chief stimulus which causes stomata to open. View Answer. Following factors affect the rate of transpiration: (a) External factors. According to Parker (1949) the rate of transpiration is directly proportional to the root-shoot ratio. Transpiration in high under View Answer. This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. 7. 13 min. External Factors Affecting The Rate of Transpiration Atmospheric humidity: Increase in relative humidity decreases the rate of transpiration. External factors 1. External or Environmental factors: 1. The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. The table below explains how factors increase the rate of transpiration: Plants living in different habitats have adaptations to resist extremes of these factors. in the cells; compactly arranged mesophyll cells etc. TOS4. Factors Affecting the Rate of Transpiration The rate transpiration is affected by a number of environmental (external) and plant (internal) factors. Stomata open in light and close in darkness. (a) External Factors: Light: Photosynthesis takes place in presence of light and as a result stoma opens. Disclaimer Copyright, Share Your Knowledge Transpiration is the loss of water from the plant surface into the atmosphere. Factors Affecting Transpiration External Factors:-i) Relative Humidity:- Relative humidity is the percentage of water vapours in the air at a given time and temperature. The rate of transpiration is roughly proportional to the intensity of light. Share Your PPT File. The rate of transpiration is always affected by a group of environmental factors like light, temperature, wind, atmospheric humidity, atmospheric pressure, availability of soil water, anti-transpirants. Watch all CBSE Class 5 to 12 Video Lectures here. The external factors are humidity, wind, atmospheric pressure, temperature, light and water. When there is water deficiency, the guard cells become flaccid and the stomata closes. Availability of soil water greatly affects the rate of transpiration. Transpiration, the loss of water vapor from plants, is a physical process that is under control of both external physical and physiological factors. There are, however, a number of external factors that affect the rate of transpiration, namely: temperature, light intensity, humidity, and wind. When there is water deficiency, the guard cells become flaccid and the stomata closes. Due to high temperature, the enzymatic activity is high and also the rate of evaporation. Explain its significance. Suggested Citation:"External Policies and Factors Affecting Transit Use." Environmental Factors. External factors affecting transpiration - Light, atmospheric moisture, wind velocity, air temperature, solar radiation and soil environment. Factors affecting transpiration: External factors: Light: Transpiration is indirectly affected by light. In CAM plants, stomata open during dark and remain closed during day. The BBC is not responsible for the content of external sites. Answer Now and help others. The rate of transpiration will be high in dry air and less in moist air. 2001. The mode of action of light is both direct and indirect. Which of the following factors is the most important in the regulation of transpiration? As the outward diffusion of water vapors through stomata is in accordance with the law of simple diffusion, the rate of transpiration is greatly reduced when the atmosphere is very humid. External or Environmental factors: Type # B. The number, size, position and the movement of stomata affect rate of transpiration. Whereas the desert plants with thick cuticle and sunken stomata have low rate of transpiration. The following article highlights the two types of factors that affect the rate of transpiration. Share Your Word File 1. External Factors . There are, however, a number of external factors that affect the rate of transpiration, namely: temperature, light intensity, humidity, and wind. What are antibiotics? If humidity is high, rate of evaporation is low and so the rate of transpiration is slow. View Answer. Wind: The increase in the wind velocity increases the rate of transpiration by remouing the water … Root shoot ratio: Transpiration increases with root shoot ratio. Temperature: It increases the rate of transpiration as it hastens transformation of water into water … The factors affecting the rate of transpiration can be categorized into two groups: (A) External or Environmental Factors and (B) Internal or Structural or Plant Factors. Humidity of air; Water is evaporated through the stomata. Factors Affecting the Rate of Transpiration. The factors affecting rate of transpiration can be categorized under two groups:. The rate of transpiration is influenced by certain factors; these factors may be classified as the (i) External factors or the environmental factors (ii) Internal factors or plants factor. Privacy Policy3. Factors Affecting the Rate of Transpiration in Plants. 20,000+ Learning videos. Following factors affect the rate of transpiration: (a) External factors. This is not only because evaporation occurs quickly in warmer air but also because warm air is capable of holding more water vapors than the cold air. 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