8. How the vascular cambium is responsible for secondary growth? Available water: The higher the water availability in the soil, greater is 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. Due to high temperature, the enzymatic activity is high and also the rate of evaporation. The external and internal factors affecting the rate of transpiration are as follows: With the deficiency … × The following article highlights the two types of factors that affect the rate of transpiration. If there is more moisture in the air the less amount of water will evaporates from the plant surface. Atmospheric humidity In a humid atmosphere, (when relative humidity) is high), the rate of transpiration decreases. The process of transpiration is influenced by a number of factors which may be broadly classified as External factors and Internal factors. External factors affecting transpiration - Light, atmospheric moisture, wind velocity, air temperature, solar radiation and soil environment. Plants regulate the rate of transpiration by opening and closing of stomata (Figure 5.14). The table below explains how factors increase the rate of transpiration: Plants living in different habitats have adaptations to resist extremes of these factors. 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. The factors affecting rate of transpiration can be categorized under two groups:. E = No. When there is water deficiency, the guard cells become flaccid and the stomata closes. The external and internal factors affecting the rate of transpiration are as follows: Which organelle is known as “power house” of the cell? The external factors are humidity, wind, atmospheric pressure, temperature, light and water. Factors Affecting the Rate of Transpiration The rate transpiration is affected by a number of environmental (external) and plant (internal) factors. Environmental Factors. (A) Internal factors : Leaf area : Larger the surface area of the leaves, more is the transpiration. TOS4. This follows the simple law of diffusion. Direct effect of light is on the opening and closing of stomata. in the cells; compactly arranged mesophyll cells etc. Root shoot ratio: Transpiration increases with root shoot ratio. 7. Which is the most important factor in regulation of transpiration ? Share Your PPT File. 9. 8,00,000+ Homework Questions. There is a close inter-relationship between transpiration and leaf structure. 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. 13 min. Humidity of air; Water is evaporated through the stomata. Humidity External factors 1. With the increase in atmospheric temperature, the rate of transpiration also increases. External Factors These include conditions of the environment which affect the rate of transpiration. But even internal factors affect the rate of transpiration. Share Your Word File There are different factors that can affect the rate of transpiration as discussed below. The rate of transpiration is always greater in light than in darkness. 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. If humidity is high, rate of evaporation is low and so the rate of transpiration is slow. Wind velocity: The higher the wind, the greater the transpiration. Leaf area: The plants with broad leaves have high rate of transpiration. There are, however, a number of external factors that affect the rate of transpiration, namely: temperature, light intensity, humidity, and wind. External factors. Light: The presence of light favours the opening of stomata and transpiration takes place through them. Internal or Structural or Plant Factors: The best answers are voted up and rise to the top. It is simply because of this reason that all plants show a daily periodicity of transpiration rate. 10. Factors Affecting Transpiration in Plants, Factors Affecting Transpiration: 10 Factors, Factors Affecting Opening and Closing of Stomata: 4 Factors. 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. 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. Explain its significance. 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