We are going to be discussing about each one of these in brief. Factors Affecting Transpiration - External. The factors affecting the transpiration include. View Answer. The table below explains how factors increase the rate of transpiration: Plants living in different habitats have adaptations to resist extremes of these factors. When there is water deficiency, the guard cells become flaccid and the stomata closes. help in reducing 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. Atmospheric humidity In a humid atmosphere, (when relative humidity) is high), the rate of transpiration decreases. 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. ‘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. The rate of transpiration is affected by several factors. The stoma opens and transpiration occurs. This is the ratio of the surface of root system to that of shoot system. Factors affecting the rate of transpiration. The external factors are humidity, wind, atmospheric pressure, temperature, light and water. The process of transpiration is influenced by a number of factors which may be broadly classified as External factors and Internal factors. Fast moving air currents continually bring fresh, dry masses of air in contact with leaf surfaces and thus maintain a high rate of transpiration. Stomata open in light and close in darkness. 20,000+ Learning videos. Name the types of nitrogenous bases present in the RNA. 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. This leads to decrease in transpiration. Factors Affecting the Rate of Transpiration in Plants. in the cells; compactly arranged mesophyll cells etc. 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. Before sharing your knowledge on this site, please read the following pages: 1. External or Environmental factors: 1. The rate of transpiration is roughly proportional to the intensity of light. Affecting factors of transpiration are of two types; External and Internal. Humidity of air; Water is evaporated through the stomata. Factors affecting transpiration. The factors affecting rate of transpiration can be categorized under two groups:. Environmental Factors. Reduced CO2 concentration favours opening of stomata while an increase in CO2 concentration promotes stomatal closing. Available water :If available water in the soil is low the transpiration is also low. Many environmental factors, such as intensity of light, temperature, atmospheric humidity, wind, availability of soil water, etc., greatly affect the rate of transpiration. This leads to decrease in 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. TOS4. Factors affecting rate of transpiration. Availability of soil water greatly affects the rate of transpiration. Direct effect of light is on the opening and closing of stomata. Atmospheric humidity: Increase in relative humidity decreases the rate of transpiration. Humidity:Humidity refers to the amount of water vapour present in the atmosphere. Factors Affecting Transpiration in Plants, Factors Affecting Transpiration: 10 Factors, Factors Affecting Opening and Closing of Stomata: 4 Factors. External Factors These include conditions of the environment which affect the rate of transpiration. So light is the main factor, which influences transpiration. Humidity of air; Water is evaporated through the stomata. 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So light is the main factor, which influences 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. How the vascular cambium is responsible for secondary growth? Leaf structure: The leaves with surface stomata, thin cuticle have high rate of transpiration. The rate of transpiration will be high in dry air and less in moist air. 13 min. External Factors Affecting The Rate of Transpiration Available water:The higher the water availability in the soil, greater is transpiration. 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. 9. Factors Affecting the Rate of Transpiration. Plants regulate the rate of transpiration by opening and closing of stomata (Figure 5.14). These factors also affect the stomatal movements. This follows the simple law of diffusion. If there is little water available, the resulting tendency for dehydration of the leaf causes stomatal closure and a consequent fall in transpiration. Many environmental factors, such as intensity of light, temperature, atmospheric humidity, wind, availability of soil water, etc., greatly affect the rate of transpiration. Share Your Word File Following factors affect the rate of transpiration: (a) External factors. This is a question and answer forum for students, teachers and general visitors for exchanging articles, answers and notes. Watch Factors Affecting Transpiration - External in English from Transpiration and Significance of Transpiration here. Which organelle is known as “power house” of the cell? 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. When there is water deficiency, the guard cells become flaccid and the stomata closes. Whereas the desert plants with thick cuticle and sunken stomata have low rate of transpiration. External Factors Affecting The Rate of Transpiration Light. factors in crop growth, development, and productivity Enumerated below are the environmental factors affecting transpiration in plants. of epidermal cells in same unit area. What are antibiotics? 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. The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. Factors Affecting the Rate of Transpiration. If the loss of turgor extends to the rest of the leaf and stem, the plant wilts. External factors 1. The rate of transpiration is roughly inversely proportional to atmospheric 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. (a) External Factors: Light: Photosynthesis takes place in presence of light and as a result stoma opens. Privacy Policy3. Temperature: The rate of transpiration increases with increase in temperature. Relative Humidity. In CAM plants, stomata open during dark and remain closed during day. Related Questions to study. Type # A. The increasing light intensity raises the temperature of leaf cells and thus increases the rate at which liquid water is transformed into vapors. If leaf area is more, transpiration is faster. Plants regulate the rate of transpiration by opening and closing of stomata (Figure 5.14). Internal Factors. 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. 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. The environmental factors affecting the rate of transpiration are: Light, Humidity, Temperature, Atmospheric pressure, Wind speed or velocity. 2001. The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. If the root system cannot absorb sufficient water, there leads to water deficit and decrease in rate of transpiration. Yeast: Origin, Reproduction, Life Cycle and Growth Requirements | Industrial Microbiology, How is Bread Made Step by Step? atmospheric humidity, temperature, wind velocity, light, water supply, atmospheric pressure, sprays and dusts and vital activities); Internal or Structural factors (eg. External Factors . Transportation Research Board. 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. E = No. Share Your PDF File Answer Now and help others. (A) Internal factors : Leaf area : Larger the surface area of the leaves, more is the transpiration. If there is more moisture in the air the less amount of water will evaporates from the plant surface. Washington, DC: The National Academies Press. 10,000+ Fundamental concepts. What type of asexual reproduction is found in Plasmodium? 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) … Atmospheric Humidity: The rate of transpiration is roughly inversely proportional to atmospheric humidity. There are, however, a number of external factors that affect the rate of transpiration, namely: temperature, light intensity, humidity, and wind. Factors Affecting Transpiration - External. View Answer. Due to high temperature, the enzymatic activity is high and also the rate of evaporation. (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. Which of the following chemical serves as an anti-transpirant in plant? factors affecting transpiration rate A. Available water: The higher the water availability in the soil, greater is transpiration. There are different factors that can affect the rate of transpiration as discussed below. There are, however, a number of external factors that affect the rate of transpiration, namely: temperature, light intensity, humidity, and wind. 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. ‘Ibis diffusion can take place only if the water vapor content of the outer atmosphere is … The BBC is not responsible for the content of external sites. Light: The presence of light favours the opening of stomata and transpiration takes place through them. Watch all CBSE Class 5 to 12 Video Lectures here. Transpiration is inversely proportional to the relative humidity in the air. 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. Which is the most important factor in regulation of transpiration ? External factors affecting transpiration - Light, atmospheric moisture, wind velocity, air temperature, solar radiation and soil environment. Temperature: With the increase of temperature water vapourises rapidly and increased the humidity in the atmosphere. If humidity is high, rate of evaporation is low and so the rate of transpiration is slow. 10. 1. These include conditions of the environment which affect the rate of transpiration. Wind increases the rate of transpiration. Sunken stomata help in reducing the rate of stomatal transpiration. Making Transit Work: Insight from Western Europe, Canada, and the United States -- Special Report 257. According to Parker (1949) the rate of transpiration is directly proportional to the root-shoot ratio. This follows the simple law of diffusion. The osmotic potential increases and the guard cells get turgid. Temperature: It increases the rate of trans­piration as it hastens trans­formation of water into water … View Answer. Plants regulate the rate of transpiration by opening and … Following factors affect the rate of transpiration: (a) External factors. 7. Number of stomata per unit area of leaf is called stomatal frequency. Light: Light induces photosynthesis in guard cells  leading to sugar synthesis. With the deficiency … 8. External factors. 8,00,000+ Homework Questions. Our mission is to provide an online platform to help students to share notes in Biology. Related Questions to study. Temperature: With the increase of temperature water vapourises rapidly and increased the humidity in the atmosphere. Transpiration is the loss of water from the plant surface into the atmosphere. The external and internal factors affecting the rate of transpiration are as follows: External or Environmental factors: Type # B. Content Guidelines 2. Factors affecting transpiration: External factors: Light: Transpiration is indirectly affected by light. The rate of transpiration is always greater in light than in darkness. Internal or Structural or Plant Factors: The best answers are voted up and rise to the top. 13 min. The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. Factors That Influence Transpiration - Displaying top 8 worksheets found for this concept. When absorption of water by the roots fails to keep up with the rate of transpiration, loss of turgor occurs, and the stomata close. 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. But even internal factors affect the rate of transpiration. There is a close inter-relationship between transpiration and leaf structure. All the above factors are external factors related to the environment. The velocity of wind greatly affects the rate of transpiration. Watch all CBSE Class 5 to 12 Video Lectures here. SignUp for free. Rate of transpire varies greatly geographically and over time. 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. Root shoot ratio: Transpiration increases with root shoot ratio. There is a close inter-relationship between transpiration and leaf structure. × The rate of transpiration is inversely proportional to the atmospheric pressure. Leaf area: The plants with broad leaves have high rate of transpiration. Type # A. External or Environmental factors (eg. Bright light is the chief stimulus which causes stomata to open. (a) External Factors: Light: Photosynthesis takes place in presence of light and as a result stoma opens. These factors are described as "environmental" to distinguish them from those genetic factors which are inherent in the plants. The mode of action of light is both direct and indirect. Also, the water molecules diffuse out slowly in humid weather. Suggested Citation:"External Policies and Factors Affecting Transit Use." In xerophytes the leaves are reduced in size or may even fall to check transpiration. Transpiration in high under View Answer. Welcome to BiologyDiscussion! Factors Affecting the Rate of Transpiration The rate transpiration is affected by a number of environmental (external) and plant (internal) factors. So light indirectly induces transpiration. Wind: Wind is air in motion which enhances the rate of evaporation. 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. This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. The external and internal factors affecting the rate of transpiration are as follows: Light affects the rate of transpiration as it is directly involved in the opening and closing of stomata. As the air becomes dry, the rate of transpiration also increases proportionately. Humidity Share Your PPT File. 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 the leaves are arranged transversely on the shoot they lose more water because they are exposed to direct sunlight. If placed perpendicularly they transpire at slower rate. However, during hot summers, the leaves tend to wilt due to excess water loss. Affecting factors of transpiration are of two types; External and Internal. Factors affecting transpiration. So, the transpiration is high. The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. Wind: The increase in the wind velocity increases the rate of transpiration by remouing the water … Explain its significance. 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. With the increase in atmospheric temperature, the rate of transpiration also increases. Plants regulate the rate of transpiration by opening and closing of stomata (see figure below). In dark stomata are closed and stomatal transpiration is checked. All the above factors are external factors related to the environment. The number, size, position and the movement of stomata affect rate of transpiration. doi: 10.17226/10110. Disclaimer Copyright, Share Your Knowledge This is because the surface area is high allowing for larger escape of water molecules from the surface. Solar radiation provides the energy source for transpiration. The external factors are humidity, wind, atmospheric pressure, temperature, light and water. The following article highlights the two types of factors that 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 more the number of stomata per unit area of leaf, the greater is the transpiration. Factors affecting Transpiration Rate of Transpiration is affected both by the Internal and External Factors. Wind velocity: The higher the wind, the greater the transpiration. This immediately reduces the rate of transpiration (as well as of photosynthesis). Which of the following factors is the most important in the regulation of transpiration? Watch Factors Affecting Transpiration - External in English from Transpiration and Significance of Transpiration here. 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