This was shown by Devlin (1975) with data obtained by Miller (1938) from two varieties of corn (maize). The mode of action of … stomata, as in adelfa or Nerium oleander, wind movement. Factors Affecting the Rate of Transpiration. The zebra plant had the highest transpiration rates compared to the other three plant species. Reduction in transpiration is desired in high priced crops, seedling transplantations in nurseries, etc. affect the rate of transpiration? This is because a plant with more root surface area will absorb more water provided that soil water is available. During the day time the transpiration is greater due to low humidity. Rate of transpiration is influenced by wind speed, availability of water and temperature. at the same time conserves water. Leaves that Several structural All other plant factors and the outside environment being equally favorable, the rate of transpiration tends to increase with higher root-shoot ratio. For example, it is expected that a plant with a root:shoot value of 1 (example: root area/leaf area = 1/1 = 1) will tend to transpire faster than another plant with a root to shoot ratio of 0.5 (example 0.5/1 = 0.5). The cuticle, being made of wax, has a limiting effect on the R. 1975. By shanice8801 Nov 02, 2014 493 Words. of water loss at daytime will be high. The cuticle, being made of wax, has a limiting effect on the If the answer is not available please wait for a while and a community member will probably answer this The stoma is the shade. For instance, the zebra plant had a high rate of 4.2 ml/hr during normal environmental conditions and a rate of 7.6 ml/hr during the wind stimulation. As such, wind movement on the leaf surface will be reduced so that the Plants regulate the rate of transpiration by opening and closing of stomata (see figure below). Transpiration is an important factor in the water cycle as it is one of the major sources of water into the atmosphere.Providing 10% of the total water in the atmosphere, this process is nearly identical to perspiration or sweating in animals. These factors are also described as internal , their manifestation being dictated by the genetic factor of plant growth and development. Values in this high order have been questioned for various reasons by Smith (1991). Stunted growth : Excessive rate of transpiration leads to stunted growth of plants. breaks. Leaf area and number of stomata. Therefore, it is expected that a bigger plant will have more stomates, the main passageway for the evaporation of water from plants. Atmospheric humidity: Highly humid atmosphere decreases the rate of transpiration. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. Leaf and Highest Transpiration Rates. Sunken Several structural These include thick cuticles, thick also lessen the rate of transpiration by sheltering the boundary layer from Take note from the given numerical examples (1/1 = 1 and 0.5/1 = 0.5) that with equal shoot area (presumed constant at 1, the denominator in the given fractions), a higher root:shoot ratio means that the plant has more root area (1 against 0.5, the numerators in the given fractions). If the soil is wet more water can be absorbed which results in more transpiration and if air around the tree is dry , more transpiration occurs in order to saturate the air to cool the temperature down.so ans has to be op B. atmosphere. 5. There are various factors affecting the rate of transpiration in plants, particularly stomatal transpiration. features lessen the rate of transpiration. Wind: The increase in the wind velocity increases the rate of transpiration by remouing the water … plant pore through which water primarily escapes in the process of Stomatal movement. 2. These include thick cuticles, thick Wind increased the rate of transpiration the most while Heat and Light followed suit in that order. Can you explain this answer? Breezy conditions would increase the rate of evaporation of water from the surface of the leaves, lowering the water potential, and resulting in more rapid evaporation. Various environmental factors, including those conditions which directly influence the opening and closing of the stomata, will affect a plant's transpiration rate. The main type of potometer is the ‘bubble’ potometer shown in the figure below. All other plant factors and the outside environment being equally favorable, the rate of transpiration tends to increase with higher root-shoot ratio. cell walls, sunken stomata, and hairs or pubescence. If the rate of transpiration increases, the rate of absorption of water by the root increases too. With cited rates of transpiration in plants, shows mathematical derivation of water loss in corn and the significance of the process. Plant Physiology. are solved by group of students and teacher of NEET, which is also the largest student 2013). cuticles than those which are adapted to cool, moist climates. soon. In general, the stomata close at temperatures about 0°C and progressively increase in aperture up to about 30°C (Devlin 1975). Light: The rate of transpiration is roughly proportional to the intensity of light. The remaining 97–99.5% is lost by transpiration and guttation. over here on EduRev! Suppose you coated the leaves of a plant with petroleum jelly. develop in open sun also have thicker cuticles than those which develop under Since relative humidity is the actual amount of water vapours in the atmosphere at any given time, the rate of transpiration is mainly dependent on it. ANTITRANSPIRANTS. Practical application: It is common to trim the leaves of broadleaved seedlings before transplanting, like coffee, to one-third or thereabout of original length to reduce transpirational loss. Wind – Wind can alter rates of transpiration by removing the boundary layer, that still layer of water vapor hugging the surface of leaves. Correct answer is option 'B'. The rate of transpiration depends upon the difference in the vapour pressure between the internal atmosphere of the leaf and air outside the leaf. Transpiration Rates To compare plants of different sizes and different leaf areas, it is necessary to express the transpiration rate on an equal area basis of 1 cm 2. This might be because its leaves might be larger, which means it has more stomata or even larger stomata, which provide more ways for the water to evaporate. Leaves that By continuing, I agree that I am at least 13 years old and have read and cm.The data showed that the bigger plant transpired less per unit area of leaf surface at 629 g of water per sq. which are adapted to dry, hot climates have thick l  Search Aid  l   Terms of Use   l   Privacy   l   This Site   l   About Me   l   Disclosure   l   Donate   l  Contact Us  l, Copyright © 2010-19 cropsreview.com All Rights Reserved, Towards a sculpted contour in agriculture, Pineapple, a CAM plant, is a xerophyte having fair adaptation to conditions with scarce water supply. the lighter it is, the faster the transpiration rate: -> the stomata open when it gets light (the lighter it is, the wider they open) -when it's dark the stomata are usually closed, so there is little transpiration how does temp. It is aimed to prevent dessication and thus improve the chance of newly field-planted seedlings to survive under field conditions. develop in open sun also have thicker cuticles than those which develop under Plant type – Some plants, like cacti and other succulents, naturally hold onto their water and don’t transpire as much. transpiration. transpiration rate by hampering the diffusion of water vapor to the outside But in plants that exhibit CAM (crassulacean acid metabolism) Light Plants transpire more rapidly in the light than in the dark. is done on EduRev Study Group by NEET Students. m/hour. Practical application: It is possible to reduce the rate of transpiration (abruptly but temporary) of any plant by root pruning. This discussion on Rate of transpiration is highest whena)Soil is dry and air is humidb)Soil is wet and air is dryc)Both soil and air are dryd)Soil is wet and air is humidCorrect answer is option 'B'. 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