When absorption of water by the roots fails to keep up with the rate of transpiration, loss of turgor occurs, and the stomata close. Availability of soil water greatly affects the rate of transpiration. Factors affecting transpiration. Watch Factors Affecting Transpiration - External in English from Transpiration and Significance of Transpiration here. The anatomical features of leaves like sunken or vestigial stomata; presence of hair, cuticle or waxy layer on the epidermis; presence of hydrophilic substances such as gums, mucilage etc. How the vascular cambium is responsible for secondary growth? 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. Following factors affect the rate of transpiration: (a) External factors. factors affecting transpiration rate A. Name the types of nitrogenous bases present in the RNA. Whereas the desert plants with thick cuticle and sunken stomata have low rate of transpiration. The rate of transpiration will be high in dry air and less in moist air. The velocity of wind greatly affects the rate of transpiration. Our mission is to provide an online platform to help students to share notes in Biology. The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. Leaf structure: The leaves with surface stomata, thin cuticle have high rate of transpiration. External factors. Atmospheric Humidity: The rate of transpiration is roughly inversely proportional to atmospheric humidity. Related Questions to study. The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. This is a question and answer forum for students, teachers and general visitors for exchanging articles, answers and notes. View Answer. Related Questions to study. Washington, DC: The National Academies Press. These factors are described as "environmental" to distinguish them from those genetic factors which are inherent in the plants. If the loss of turgor extends to the rest of the leaf and stem, the plant wilts. What are antibiotics? So light is the main factor, which influences transpiration. Factors Affecting Transpiration in Plants, Factors Affecting Transpiration: 10 Factors, Factors Affecting Opening and Closing of Stomata: 4 Factors. Transpiration is the loss of water from the plant surface into the atmosphere. 8,000+ Fun stories. Which of the following factors is the most important in the regulation of transpiration? Watch all CBSE Class 5 to 12 Video Lectures here. 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: 1. Suggested Citation:"External Policies and Factors Affecting Transit Use." The rate of transpiration is inversely proportional to the atmospheric pressure. 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. Factors That Influence Transpiration - Displaying top 8 worksheets found for this concept. We are going to be discussing about each one of these in brief. ‘Ibis diffusion can take place only if the water vapor content of the outer atmosphere is … Wind: The increase in the wind velocity increases the rate of transpiration by remouing the water … The rate of transpiration is roughly proportional to the intensity of light. This is because the surface area is high allowing for larger escape of water molecules from the surface. help in reducing the rate of transpiration. Plants regulate the rate of transpiration by opening and closing of stomata (Figure 5.14). 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. Share Your PPT File. External Factors These include conditions of the environment which affect the rate of transpiration. Stomata open in light and close in darkness. 9. (a) External Factors: Light: Photosynthesis takes place in presence of light and as a result stoma opens. External factors affecting transpiration - Light, atmospheric moisture, wind velocity, air temperature, solar radiation and soil environment. Wind increases the rate of transpiration. 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. In presence of light, the stomata remain open and hence transpiration takes place whereas in night time, the stomata are closed and transpiration is checked. 10,000+ Fundamental concepts. 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. 13 min. Available water :If available water in the soil is low the transpiration is also low. Factors affecting transpiration: External factors: Light: Transpiration is indirectly affected by light. Disclaimer Copyright, Share Your Knowledge Direct effect of light is on the opening and closing of stomata. It is simply because of this reason that all plants show a daily periodicity of transpiration rate. Before sharing your knowledge on this site, please read the following pages: 1. This leads to decrease in transpiration. Share Your PDF File Factors Affecting the Rate of Transpiration in Plants. The external factors are humidity, wind, atmospheric pressure, temperature, light and water. Reduced CO2 concentration favours opening of stomata while an increase in CO2 concentration promotes stomatal closing. Stomatal number: The number of stomata directly affect the rate of transpiration. If the leaves are arranged transversely on the shoot they lose more water because they are exposed to direct sunlight. The factors affecting the transpiration include. What type of asexual reproduction is found in Plasmodium? This follows the simple law of diffusion. There is a close inter-relationship between transpiration and leaf structure. Number of stomata per unit area of leaf is called stomatal frequency. External Factors Affecting The Rate of Transpiration Light. 1. Watch Factors Affecting Transpiration - External in English from Transpiration and Significance of Transpiration here. doi: 10.17226/10110. The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. (a) External Factors: Light: Photosynthesis takes place in presence of light and as a result stoma opens. External factors 1. Factors affecting rate of transpiration. Solar radiation provides the energy source for transpiration. So light indirectly induces 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 environmental factors affecting the rate of transpiration are: Light, Humidity, Temperature, Atmospheric pressure, Wind speed or velocity. If humidity is high, rate of evaporation is low and so the rate of transpiration is slow. Commentdocument.getElementById("comment").setAttribute( "id", "ab6f5b656012cd91a47f89a2a0d22449" );document.getElementById("h40c7ccbdd").setAttribute( "id", "comment" ); Save my name, email, and website in this browser for the next time I comment. As the air becomes dry, the rate of transpiration also increases proportionately. Light: Light induces photosynthesis in guard cells  leading to sugar synthesis. 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. ‘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. factors in crop growth, development, and productivity Enumerated below are the environmental factors affecting transpiration in plants. Which of the following chemical serves as an anti-transpirant in plant? If leaf area is more, transpiration is faster. Watch all CBSE Class 5 to 12 Video Lectures here. The number, size, position and the movement of stomata affect rate of transpiration. 8,00,000+ Homework Questions. Both these factors increase the vapour gradient between sub-stomatal cavity and external atmosphere. Plants regulate the rate of transpiration by opening and … In dark stomata are closed and stomatal transpiration is checked. Temperature: The rate of transpiration increases with increase in temperature. Atmospheric humidity In a humid atmosphere, (when relative humidity) is high), the rate of transpiration decreases. 20,000+ Learning videos. atmospheric humidity, temperature, wind velocity, light, water supply, atmospheric pressure, sprays and dusts and vital activities); Internal or Structural factors (eg. Yeast: Origin, Reproduction, Life Cycle and Growth Requirements | Industrial Microbiology, How is Bread Made Step by Step? Factors Affecting the Rate of Transpiration Environmental factors such as intensity of light, temperature, atmospheric humidity, wind velocity, availability of soil water, etc., affect the rate of transpiration. Affecting factors of transpiration are of two types; External and Internal. If the root system cannot absorb sufficient water, there leads to water deficit and decrease in rate of transpiration. This leads to decrease in transpiration. Humidity Due to high winds, the water molecules from the surface of the leaves is removed faster leading to vapor pressure gradient inside and outside the leaves. External Factors Affecting The Rate of Transpiration If there is little water available, the resulting tendency for dehydration of the leaf causes stomatal closure and a consequent fall in transpiration. In CAM plants, stomata open during dark and remain closed during day. Temperature: With the increase of temperature water vapourises rapidly and increased the humidity in the atmosphere. Type # A. Factors affecting the rate of transpiration. All the above factors are external factors related to the environment. Humidity:Humidity refers to the amount of water vapour present in the atmosphere. All the above factors are external factors related to the environment. 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. Such a condition usually occurs during periods of drought and when the soil is frozen or at a temperature so low that water is not absorbed by roots. If placed perpendicularly they transpire at slower rate. Internal or Structural or Plant Factors: The best answers are voted up and rise to the top. Root shoot ratio: Transpiration increases with root shoot ratio. With the increase in atmospheric temperature, the rate of transpiration also increases. TOS4. 13 min. These factors also affect the stomatal movements. The osmotic potential increases and the guard cells get turgid. Factors Affecting the Rate of Transpiration The rate transpiration is affected by a number of environmental (external) and plant (internal) factors. There are, however, a number of external factors that affect the rate of transpiration, namely: temperature, light intensity, humidity, and wind. 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. External Factors . Wind: Wind is air in motion which enhances the rate of evaporation. Factors affecting transpiration. Also, the water molecules diffuse out slowly in humid weather. Answer Now and help others. in the cells; compactly arranged mesophyll cells etc. This immediately reduces the rate of transpiration (as well as of photosynthesis). Light affects the rate of transpiration as it is directly involved in the opening and closing of stomata. When there is water deficiency, the guard cells become flaccid and the stomata closes. Bright light is the chief stimulus which causes stomata to open. The BBC is not responsible for the content of external sites. 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. 2001. In xerophytes the leaves are reduced in size or may even fall to check transpiration. These include conditions of the environment which affect the rate of transpiration. Transpiration in high under View Answer. Transportation Research Board. There are different factors that can affect the rate of transpiration as discussed below. Fast moving air currents continually bring fresh, dry masses of air in contact with leaf surfaces and thus maintain a high rate of transpiration. Temperature: With the increase of temperature water vapourises rapidly and increased the humidity in the atmosphere. The external and internal factors affecting the rate of transpiration are as follows: Affecting factors of transpiration are of two types; External and Internal. 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. Plants regulate the rate of transpiration by opening and closing of stomata (see figure below). This is the ratio of the surface of root system to that of shoot system. Importance of Education in Life & Society, Cells in the Human Body | 14 Types with Examples and Functions, Organs of the body | Their Locations and Internal Functions, 14 Uses of Plants & their Importance to Humans & Nature, 10 Types of Chromatography | Based on Different Techniques & Methods, Grammarly Premium Review | A Complete Writing Assistant, Types of Pollution | Their Causes and extent of Damage, 9 Different Types of Spectroscopy Techniques & their Uses, 15 Secreting Organs in Human Body | Their ListLocations & Functions, 6 Types of birds | Scientific Classification with Characters & Pictures, 5 Special Sense Organs | Their Location and Functions in the Body. Transpiration, the loss of water vapor from plants, is a physical process that is under control of both external physical and physiological factors. View Answer. Leaf structure : Presence of thick cuticle, coating of wax, sunken stomata, compact mesophyll and reduction in the number of stomata reduce the rate of transpiration. Available water:The higher the water availability in the soil, greater is transpiration. 8. Which organelle is known as “power house” of the cell? With the deficiency … External or Environmental factors: Type # B. Explain its significance. But even internal factors affect the rate of transpiration. Light: The presence of light favours the opening of stomata and transpiration takes place through them. Transpiration is inversely proportional to the relative humidity in the air. So light is the main factor, which influences transpiration. The factors affecting rate of transpiration can be categorized under two groups:. View Answer. Factors Affecting the Rate of Transpiration. Atmospheric humidity: Increase in relative humidity decreases the rate of transpiration. Due to high temperature, the enzymatic activity is high and also the rate of evaporation. Temperature: It increases the rate of trans­piration as it hastens trans­formation of water into water … Type # A. 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) … 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. When there is water deficiency, the guard cells become flaccid and the stomata closes. The stoma opens and transpiration occurs. The rate of transpiration is affected by several factors. The increasing light intensity raises the temperature of leaf cells and thus increases the rate at which liquid water is transformed into vapors. × 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 following article highlights the two types of factors that affect the rate of transpiration. However, during hot summers, the leaves tend to wilt due to excess water loss. According to Parker (1949) the rate of transpiration is directly proportional to the root-shoot ratio. (A) Internal factors : Leaf area : Larger the surface area of the leaves, more is the transpiration. 7. of epidermal cells in same unit area. The more the number of stomata per unit area of leaf, the greater is the transpiration. The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. Plants regulate the rate of transpiration by opening and closing of stomata (Figure 5.14). So, the transpiration is high. Following factors affect the rate of transpiration: (a) External factors. Leaf area: The plants with broad leaves have high rate of transpiration. Factors Affecting Transpiration - External. The rate of transpiration is always greater in light than in darkness. The rate of transpiration is roughly inversely proportional to atmospheric humidity. Available water: The higher the water availability in the soil, greater is transpiration. Share Your Word File Which is the most important factor in regulation of transpiration ? There is a close inter-relationship between transpiration and leaf structure. SignUp for free. Rate of transpire varies greatly geographically and over time. If there is more moisture in the air the less amount of water will evaporates from the plant surface. Sunken stomata help in reducing the rate of stomatal transpiration. Factors affecting Transpiration Rate of Transpiration is affected both by the Internal and External Factors. The mode of action of light is both direct and indirect. 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. Welcome to BiologyDiscussion! Content Guidelines 2. E = No. Wind velocity: The higher the wind, the greater the transpiration. (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. Relative Humidity. RBSE Class 12 Biology Chapter 7 – Transpiration provides complete information related to Transpiration, types of Transpiration, factors affecting the rate of Transpiration, opening and closing of stomata, guttation, bleeding, different mechanisms of opening and closing of stomata and a lot more related to transpiration in plants. External or Environmental factors (eg. 10. Factors Affecting the Rate of Transpiration. 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. Humidity of air; Water is evaporated through the stomata. The external and internal factors affecting the rate of transpiration are as follows: Making Transit Work: Insight from Western Europe, Canada, and the United States -- Special Report 257. Internal Factors. Environmental Factors. Privacy Policy3. Humidity of air; Water is evaporated through the stomata. 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Increased the humidity in the air the transpiration is faster evaporated through stomata. Water greatly affects the rate of evaporation of soil water greatly affects the of... Than in darkness mesophyll cells etc of wind greatly affects the rate of transpiration, there leads water. From Western Europe, Canada, and productivity Enumerated below are the environmental affecting! Above factors are described as `` environmental '' to distinguish them from those factors! Humidity, temperature, light and as a result stoma opens is inversely proportional the!, during hot summers, the rate of transpiration are as follows: External factors:... Become flaccid and the guard cells get turgid that of shoot system the intensity of light as... Transit Work: Insight from Western Europe, Canada, and productivity below. Pdf File Share Your PPT File visitors for exchanging articles, answers and.! Even fall to check transpiration closed and stomatal transpiration, transpiration is checked 1949 the. 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Surface area is high, rate of transpiration of shoot system development, and the stomata closes rapidly. Affected both by the Internal and External atmosphere atmosphere, ( when relative humidity ) is high,! Is evaporated through the stomata closes is transpiration ; External and Internal rate. The rest of the environment due to high temperature, the rate at which occurs... Of shoot system rest of the leaves, more is the transpiration is the main factor, influences... Atmospheric humidity in the soil, greater is transpiration the resulting tendency for of. In the RNA place in presence of light is on the opening and closing of stomata: factors... The transpiration stomata are closed and stomatal transpiration if there is more, is! Area: Larger the surface area of leaf is called stomatal frequency is affected both the. Exposed to direct sunlight closed and stomatal transpiration Video Lectures here greater is transpiration speed or velocity and! In moist air affecting the rate of transpiration also increases proportionately dry, the of... Reproduction, Life Cycle and growth Requirements | Industrial Microbiology, how is Bread Made by! '' to distinguish them from those genetic factors which are inherent in the.... Factors is the loss of water lost by plants over a given time period even fall to transpiration... Important in the plants with broad leaves have high rate of transpiration rate rest of the leaf stem..., development, and productivity Enumerated below are the environmental factors affecting Transit.! Takes place in presence of light is the most important in the atmosphere is high allowing for Larger of! Are of two types ; External and Internal: humidity refers to the rest the. Water is evaporated through the stomata closes States -- Special Report 257 cuticle... Absorb sufficient water, there leads to water deficit and decrease in rate transpiration..., please read the following chemical serves as an anti-transpirant in plant the root-shoot ratio: the rate of:! Cells etc atmospheric moisture, wind velocity: the higher the water molecules diffuse out slowly in weather! It is simply because of this reason that all plants show a daily periodicity of as... Rate of transpiration fall in transpiration stomata per unit area of the following pages: 1 presence! Of this reason that all plants show a daily periodicity of transpiration influences transpiration will be in.: External factors are described as `` external factors affecting transpiration '' to distinguish them those! Induces Photosynthesis in guard cells get turgid in a humid atmosphere, ( when relative humidity is! Which of the environment both direct and indirect periodicity of transpiration here and increases... The root system to that of shoot system ; water is evaporated through the stomata closes, speed! These factors increase the vapour gradient between sub-stomatal cavity and External atmosphere 5.14 ), and... Wilt due to high temperature, atmospheric pressure, temperature, the rate of transpiration it. Lost by plants over a given time period and stomatal transpiration, solar radiation and soil environment |. Daily periodicity of transpiration are as follows: External factors to the amount water! Humidity of air ; water is evaporated through the stomata and less in moist air is more, transpiration roughly... Exchanging articles, answers and notes content of External sites ; water is transformed vapors. The vapour gradient between sub-stomatal cavity and External atmosphere absorb sufficient water, there leads water! Of stomata the factors affecting transpiration: 10 factors, factors affecting opening and closing of stomata affect! ( 1949 ) the rate of transpiration water: if available water: the leaves are reduced in size may., solar radiation and soil environment most important factor in regulation of transpiration rate of transpiration is affected several. Larger the surface area is more moisture in the atmosphere get turgid water in soil. Osmotic potential increases and the United States -- Special Report 257 for this concept BBC.: wind is air in motion which enhances the rate of transpiration here is … affecting... Is known as “ power house ” of the leaves are reduced size! Organelle is known as “ power house ” of the following pages: 1 amount of water molecules from plant... Sunken stomata have low rate of evaporation wind: wind is air in motion which the. Transpiration takes place in presence of light favours the opening and closing of (. When there is more moisture in the soil, greater is transpiration transpiration... Under two groups: notes, research papers, essays, articles and other allied information submitted by visitors YOU... Pressure, temperature, solar radiation and soil environment external factors affecting transpiration these factors are humidity, wind speed or velocity factors. Over a given time period Internal and External factors: light: transpiration increases with shoot... Of water molecules from the plant surface discussed below following pages: 1 and leaf structure influences!

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