SignUp for free. Which of the following chemical serves as an anti-transpirant in plant? Fast moving air currents continually bring fresh, dry masses of air in contact with leaf surfaces and thus maintain a high rate of transpiration. Available water: The higher the water availability in the soil, greater is transpiration. Factors affecting transpiration: External factors: Light: Transpiration is indirectly affected by light. Wind velocity: The higher the wind, the greater the transpiration. Number of stomata per unit area of leaf is called stomatal frequency. 8. Transpiration is the loss of water from the plant surface into the atmosphere. Explain its significance. Light: Light induces photosynthesis in guard cells leading to sugar synthesis. This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. However, during hot summers, the leaves tend to wilt due to excess water loss. Factors affecting the rate of transpiration. Factors That Influence Transpiration - Displaying top 8 worksheets found for this concept. So, the transpiration is high. The BBC is not responsible for the content of external sites. Plants regulate the rate of transpiration by opening and closing of stomata (Figure 5.14). The osmotic potential increases and the guard cells get turgid. Light: The presence of light favours the opening of stomata and transpiration takes place through them. What type of asexual reproduction is found in Plasmodium? 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. Whereas the desert plants with thick cuticle and sunken stomata have low rate of transpiration. This follows the simple law of diffusion. Content Guidelines 2. The stoma opens and transpiration occurs. Affecting factors of transpiration are of two types; External and Internal. Atmospheric humidity: Increase in relative humidity decreases the rate of transpiration. Plants regulate the rate of transpiration by opening and … This follows the simple law of diffusion. This leads to decrease in transpiration. Due to high temperature, the enzymatic activity is high and also the rate of evaporation. These factors also affect the stomatal movements. Also, the water molecules diffuse out slowly in humid weather. Temperature: With the increase of temperature water vapourises rapidly and increased the humidity in the atmosphere. Stomata open in light and close in darkness. View Answer. 9. The rate of transpiration is always greater in light than in darkness. E = No. The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. There is a close inter-relationship between transpiration and leaf structure. 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. External or Environmental factors (eg. Reduced CO2 concentration favours opening of stomata while an increase in CO2 concentration promotes stomatal closing. 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. The number, size, position and the movement of stomata affect rate of transpiration. help in reducing the rate of transpiration. If humidity is high, rate of evaporation is low and so the rate of transpiration is slow. This leads to decrease in transpiration. If there is more moisture in the air the less amount of water will evaporates from the plant surface. of epidermal cells in same unit area. Watch all CBSE Class 5 to 12 Video Lectures here. Atmospheric Humidity: The rate of transpiration is roughly inversely proportional to atmospheric humidity. The velocity of wind greatly affects the rate of transpiration. Factors affecting transpiration. Type # A. Humidity:Humidity refers to the amount of water vapour present in the atmosphere. The external and internal factors affecting the rate of transpiration are as follows: External or Environmental factors: 1. 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. Transpiration, the loss of water vapor from plants, is a physical process that is under control of both external physical and physiological factors. Factors Affecting Transpiration - External. Factors Affecting the Rate of Transpiration in Plants. The following article highlights the two types of factors that affect the rate of transpiration. 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