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Humidity Root shoot ratio: Transpiration increases with root shoot ratio. View Answer. Factors Affecting the Rate of Transpiration. Transpiration is the loss of water from the plant surface into the atmosphere. Factors Affecting the Rate of Transpiration The rate transpiration is affected by a number of environmental (external) and plant (internal) factors. Which organelle is known as “power house” of the cell? The rate of transpiration will be high in dry air and less in moist air. 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. Related Questions to study. E = No. This leads to decrease in transpiration. If there is little water available, the resulting tendency for dehydration of the leaf causes stomatal closure and a consequent fall in transpiration. Which of the following factors is the most important in the regulation of transpiration? 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. As the air becomes dry, the rate of transpiration also increases proportionately. Transportation Research Board. help in reducing the rate of transpiration. Factors affecting transpiration. There is a close inter-relationship between transpiration and leaf structure. When absorption of water by the roots fails to keep up with the rate of transpiration, loss of turgor occurs, and the stomata close. Factors Affecting Transpiration in Plants, Factors Affecting Transpiration: 10 Factors, Factors Affecting Opening and Closing of Stomata: 4 Factors. The rate of transpiration is always greater in light than in darkness. With the deficiency … Light affects the rate of transpiration as it is directly involved in the opening and closing of stomata. External factors. 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. If humidity is high, rate of evaporation is low and so the rate of transpiration is slow. Whereas the desert plants with thick cuticle and sunken stomata have low rate of transpiration. But even internal factors affect the rate of transpiration. External Factors . In dark stomata are closed and stomatal transpiration is checked. The mode of action of light is both direct and indirect. These factors also affect the stomatal movements. This follows the simple law of diffusion. Share Your PPT File. Available water :If available water in the soil is low the transpiration is also low. SignUp for free. The number, size, position and the movement of stomata affect rate of transpiration. Answer Now and help others. 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. Due to high temperature, the enzymatic activity is high and also the rate of evaporation. Suggested Citation:"External Policies and Factors Affecting Transit Use." Affecting factors of transpiration are of two types; External and Internal. Bright light is the chief stimulus which causes stomata to open. There is a close inter-relationship between transpiration and leaf structure. Name the types of nitrogenous bases present in the RNA. External Factors These include conditions of the environment which affect the rate of transpiration. Fast moving air currents continually bring fresh, dry masses of air in contact with leaf surfaces and thus maintain a high rate of transpiration. doi: 10.17226/10110. Direct effect of light is on the opening and closing of stomata. The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. What type of asexual reproduction is found in Plasmodium? 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 table below explains how factors increase the rate of transpiration: Plants living in different habitats have adaptations to resist extremes of these factors. 2001. 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. Stomatal number: The number of stomata directly affect the rate of transpiration. The external and internal factors affecting the rate of transpiration are as follows: 8,000+ Fun stories. These factors are described as "environmental" to distinguish them from those genetic factors which are inherent in the plants. These include conditions of the environment which affect the rate of transpiration. ‘Ibis diffusion can take place only if the water vapor content of the outer atmosphere is … Factors Affecting the Rate of Transpiration in Plants. View Answer. The rate of transpiration is affected by several factors. 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. Factors That Influence Transpiration - Displaying top 8 worksheets found for this concept. Plants regulate the rate of transpiration by opening and closing of stomata (see figure below). Wind: Wind is air in motion which enhances the rate of evaporation. Humidity of air; Water is evaporated through the stomata. Availability of soil water greatly affects the rate of transpiration. If the loss of turgor extends to the rest of the leaf and stem, the plant wilts. Transpiration is inversely proportional to the relative humidity in the air. The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. What are antibiotics? Many environmental factors, such as intensity of light, temperature, atmospheric humidity, wind, availability of soil water, etc., greatly affect the rate of transpiration. Before sharing your knowledge on this site, please read the following pages: 1. Factors affecting the rate of transpiration. 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. Both these factors increase the vapour gradient between sub-stomatal cavity and external atmosphere. Watch all CBSE Class 5 to 12 Video Lectures here. Share Your PDF File Affecting factors of transpiration are of two types; External and Internal. Content Guidelines 2. If there is more moisture in the air the less amount of water will evaporates from the plant surface. External factors 1. Our mission is to provide an online platform to help students to share notes in Biology. Which is the most important factor in regulation of transpiration ? Type # A. 13 min. According to Parker (1949) the rate of transpiration is directly proportional to the root-shoot ratio. External Factors Affecting The Rate of Transpiration Light. 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. The rate of transpiration is roughly proportional to the intensity of light. The rate of transpiration is inversely proportional to the atmospheric pressure. Factors affecting transpiration: External factors: Light: Transpiration is indirectly affected by light. 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