TOS4. The increasing light intensity raises the temperature of leaf cells and thus increases the rate at which liquid water is transformed into vapors. Washington, DC: The National Academies Press. 7. Explain its significance. Name the types of nitrogenous bases present in the RNA. × External factors affecting transpiration - Light, atmospheric moisture, wind velocity, air temperature, solar radiation and soil environment. Factors affecting rate of transpiration. Suggested Citation:"External Policies and Factors Affecting Transit Use." (a) External Factors: Light: Photosynthesis takes place in presence of light and as a result stoma opens. This immediately reduces the rate of transpiration (as well as of photosynthesis). Plants regulate the rate of transpiration by opening and closing of stomata (Figure 5.14). The rate of transpiration is always greater in light than in darkness. Both these factors increase the vapour gradient between sub-stomatal cavity and external atmosphere. It is simply because of this reason that all plants show a daily periodicity of transpiration rate. What are antibiotics? Affecting factors of transpiration are of two types; External and Internal. There are different factors that can affect the rate of transpiration as discussed below. Humidity:Humidity refers to the amount of water vapour present in the atmosphere. External Factors These include conditions of the environment which affect the rate of transpiration. 1. If placed perpendicularly they transpire at slower rate. Affecting factors of transpiration are of two types; External and Internal. 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. All the above factors are external factors related to the environment. Which organelle is known as “power house” of the cell? Share Your Word File Disclaimer Copyright, Share Your Knowledge The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. The environmental factors affecting the rate of transpiration are: Light, Humidity, Temperature, Atmospheric pressure, Wind speed or velocity. There is a close inter-relationship between transpiration and leaf structure. But even internal factors affect the rate of transpiration. help in reducing the rate of transpiration. ‘Ibis diffusion can take place only if the water vapor content of the outer atmosphere is less than that of the inter-cellular spaces of the leaf. When there is water deficiency, the guard cells become flaccid and the stomata closes. The external factors are humidity, wind, atmospheric pressure, temperature, light and water. Whereas the desert plants with thick cuticle and sunken stomata have low rate of transpiration. (A) Internal factors : Leaf area : Larger the surface area of the leaves, more is the 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. Temperature: In general increase in temperatures cause the plant cells which control the openings (stoma) where water is released to the atmosphere to open but at higher temperature (40°C or above) … If there is more moisture in the air the less amount of water will evaporates from the plant surface. Transpiration is inversely proportional to the relative humidity in the air. The table below explains how factors increase the rate of transpiration: Plants living in different habitats have adaptations to resist extremes of these factors. Many environmental factors, such as intensity of light, temperature, atmospheric humidity, wind, availability of soil water, etc., greatly affect the rate of transpiration. 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 at which transpiration occurs refers to the amount of water lost by plants over a given time period. External or Environmental factors: 1. Answer Now and help others. Related Questions to study. This is a question and answer forum for students, teachers and general visitors for exchanging articles, answers and notes. In xerophytes the leaves are reduced in size or may even fall to check transpiration. If humidity is high, rate of evaporation is low and so the rate of transpiration is slow. There is a close inter-relationship between transpiration and leaf structure. Leaf area: The plants with broad leaves have high rate of transpiration. Factors affecting transpiration. Making Transit Work: Insight from Western Europe, Canada, and the United States -- Special Report 257. 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. The external factors are humidity, wind, atmospheric pressure, temperature, light and water. There are, however, a number of external factors that affect the rate of transpiration, namely: temperature, light intensity, humidity, and wind. This is because the surface area is high allowing for larger escape of water molecules from the surface. The osmotic potential increases and the guard cells get turgid. If the loss of turgor extends to the rest of the leaf and stem, the plant wilts. This is the ratio of the surface of root system to that of shoot system. Stomatal number: The number of stomata directly affect the rate of transpiration. Humidity of air; Water is evaporated through the stomata. Number of stomata per unit area of leaf is called stomatal frequency. The velocity of wind greatly affects the rate of transpiration. This leads to decrease in transpiration. The process of transpiration is influenced by a number of factors which may be broadly classified as External factors and Internal factors. There are, however, a number of external factors that affect the rate of transpiration, namely: temperature, light intensity, humidity, and wind. Atmospheric Humidity: The rate of transpiration is roughly inversely proportional to atmospheric humidity. If there is little water available, the resulting tendency for dehydration of the leaf causes stomatal closure and a consequent fall in transpiration. ‘Ibis diffusion can take place only if the water vapor content of the outer atmosphere is … These include conditions of the environment which affect the rate of transpiration. Light affects the rate of transpiration as it is directly involved in the opening and closing of stomata. Internal or Structural or Plant Factors: The best answers are voted up and rise to the top. All the above factors are external factors related to the environment. So light indirectly induces transpiration. What type of asexual reproduction is found in Plasmodium? Following factors affect the rate of transpiration: (a) External factors. Watch all CBSE Class 5 to 12 Video Lectures here. The rate of transpiration is roughly proportional to the intensity of light. Content Guidelines 2. External Factors Affecting The Rate of Transpiration Light. Light: The presence of light favours the opening of stomata and transpiration takes place through them. Bright light is the chief stimulus which causes stomata to open. Many environmental factors, such as intensity of light, temperature, atmospheric humidity, wind, availability of soil water, etc., greatly affect the rate of transpiration. 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