If the root system cannot absorb sufficient water, there leads to water deficit and decrease in rate of transpiration. 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. Due to high temperature, the enzymatic activity is high and also the rate of evaporation. 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. Yeast: Origin, Reproduction, Life Cycle and Growth Requirements | Industrial Microbiology, How is Bread Made Step by Step? Factors Affecting Transpiration - External. 10. Relative Humidity. There is a close inter-relationship between transpiration and leaf structure. The table below explains how factors increase the rate of transpiration: Plants living in different habitats have adaptations to resist extremes of these factors. Bright light is the chief stimulus which causes stomata to open. factors in crop growth, development, and productivity Enumerated below are the environmental factors affecting transpiration in plants. 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. 7. The factors affecting the transpiration include. The rate of transpiration is roughly proportional to the intensity of light. Related Questions to study. The mode of action of light is both direct and indirect. Humidity:Humidity refers to the amount of water vapour present in the atmosphere. 1. This leads to decrease in transpiration. The rate of transpiration is roughly inversely proportional to atmospheric humidity. Both these factors increase the vapour gradient between sub-stomatal cavity and external atmosphere. × Reduced CO2 concentration favours opening of stomata while an increase in CO2 concentration promotes stomatal closing. There are different factors that can affect the rate of transpiration as discussed below. With the increase in atmospheric temperature, the rate of transpiration also increases. Temperature: It increases the rate of trans­piration as it hastens trans­formation of water into water … Our mission is to provide an online platform to help students to share notes in Biology. Type # A. help in reducing the rate of transpiration. Factors Affecting Transpiration in Plants, Factors Affecting Transpiration: 10 Factors, Factors Affecting Opening and Closing of Stomata: 4 Factors. External factors affecting transpiration - Light, atmospheric moisture, wind velocity, air temperature, solar radiation and soil environment. The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. E = No. Factors affecting the rate of transpiration. If leaf area is more, transpiration is faster. We are going to be discussing about each one of these in brief. It is simply because of this reason that all plants show a daily periodicity of transpiration rate. Light: Light induces photosynthesis in guard cells  leading to sugar synthesis. Direct effect of light is on the opening and closing of stomata. Many environmental factors, such as intensity of light, temperature, atmospheric humidity, wind, availability of soil water, etc., greatly affect the rate of transpiration. But even internal factors affect the rate of transpiration. Factors affecting rate of transpiration. View Answer. Root shoot ratio: Transpiration increases with root shoot ratio. The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. (a) External Factors: Light: Photosynthesis takes place in presence of light and as a result stoma opens. Transpiration is the loss of water from the plant surface into the atmosphere. Share Your PPT File. 13 min. atmospheric humidity, temperature, wind velocity, light, water supply, atmospheric pressure, sprays and dusts and vital activities); Internal or Structural factors (eg. So, the transpiration is high. If humidity is high, rate of evaporation is low and so the rate of transpiration is slow. Factors Affecting the Rate of Transpiration in Plants. These factors are described as "environmental" to distinguish them from those genetic factors which are inherent in the plants. 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 more the number of stomata per unit area of leaf, the greater is the transpiration. TOS4. External factors. 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. Available water:The higher the water availability in the soil, greater is transpiration. The stoma opens and transpiration occurs. Plants regulate the rate of transpiration by opening and closing of stomata (Figure 5.14). Number of stomata per unit area of leaf is called stomatal frequency. The number, size, position and the movement of stomata affect rate of transpiration. Related Questions to study. The rate of transpiration will be high in dry air and less in moist air. What type of asexual reproduction is found in Plasmodium? Rate of transpire varies greatly geographically and over time. Factors That Influence Transpiration - Displaying top 8 worksheets found for this concept. 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? Suggested Citation:"External Policies and Factors Affecting Transit Use." Affecting factors of transpiration are of two types; External and Internal. Factors Affecting Transpiration - External. 2001. Factors affecting transpiration: External factors: Light: Transpiration is indirectly affected by light. 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) … When there is water deficiency, the guard cells become flaccid and the stomata closes. doi: 10.17226/10110. There are, however, a number of external factors that affect the rate of transpiration, namely: temperature, light intensity, humidity, and wind. Watch all CBSE Class 5 to 12 Video Lectures here. External Factors Affecting The Rate of Transpiration Light. 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. When there is water deficiency, the guard cells become flaccid and the stomata closes. External Factors These include conditions of the environment which affect the rate of transpiration. Temperature: With the increase of temperature water vapourises rapidly and increased the humidity in the atmosphere. Plants regulate the rate of transpiration by opening and closing of stomata (see figure below). When absorption of water by the roots fails to keep up with the rate of transpiration, loss of turgor occurs, and the stomata close. Transpiration in high under View Answer. Wind increases the rate of transpiration. Following factors affect the rate of transpiration: (a) External factors. The external and internal factors affecting the rate of transpiration are as follows: ‘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. Light: The presence of light favours the opening of stomata and transpiration takes place through them. If there is little water available, the resulting tendency for dehydration of the leaf causes stomatal closure and a consequent fall in transpiration. 10,000+ Fundamental concepts. Humidity Watch Factors Affecting Transpiration - External in English from Transpiration and Significance of Transpiration here. The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. Affecting factors of transpiration are of two types; External and Internal. Before sharing your knowledge on this site, please read the following pages: 1. Leaf area: The plants with broad leaves have high rate of transpiration. Temperature: The rate of transpiration increases with increase in temperature. Share Your PDF File Privacy Policy3. This is the ratio of the surface of root system to that of shoot system. The external and internal factors affecting the rate of transpiration are as follows: The external factors are humidity, wind, atmospheric pressure, temperature, light and water. As the air becomes dry, the rate of transpiration also increases proportionately. 8. Content Guidelines 2. The external factors are humidity, wind, atmospheric pressure, temperature, light and water. of epidermal cells in same unit area. Share Your Word File Transpiration is inversely proportional to the relative humidity in the air. Name the types of nitrogenous bases present in the RNA. The following article highlights the two types of factors that affect the rate of transpiration. The process of transpiration is influenced by a number of factors which may be broadly classified as External factors and Internal factors. Humidity of air; Water is evaporated through the stomata. So light is the main factor, which influences transpiration. Many environmental factors, such as intensity of light, temperature, atmospheric humidity, wind, availability of soil water, etc., greatly affect the rate of transpiration. in the cells; compactly arranged mesophyll cells etc. These factors also affect the stomatal movements. Available water :If available water in the soil is low the transpiration is also low. The factors affecting rate of transpiration can be categorized under two groups:. Factors Affecting the Rate of Transpiration The rate transpiration is affected by a number of environmental (external) and plant (internal) factors. 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