Review of climatic factors affecting transpiration in crops such as light, relative humidity, temperature, water, wind and air. m in one hour while the smaller plant transpired 723 g/sq. However, if the plant is subjected to very high wind movement, the stomata may actually close, which prevents water loss. 4. How is transpiration important to the plants? According to Tanner and Beevers (1990) the calculated amounts of water recycled in this manner vary between 9% (at high transpiration rates) and 30% (at low transpiration rates) of the total water uptake by the roots of maize plants. Several structural A potometer measures how factors such as light, temperature, humidity, light intensity and wind will affect the rate of transpiration. The rate of transpiration depends upon the difference in the vapour pressure between the internal atmosphere of the leaf and air outside the leaf. The process of transpiration keeps the cell turgid, cools the surface of the leaves, and helps in the movement of minerals from the soil to different parts of the plant. 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. 2013). Leaf structure. When there is a high rate of wind activity, transpiration is relatively higher since the moist or humid air around the plant is quickly replaced by less humid air allowing the plant to release even more water into the atmosphere. transpiration rate by hampering the diffusion of water vapor to the outside Plant Physiology. Suppose you coated the leaves of a plant with petroleum jelly. affect the rate of transpiration? shade. cm while the other (Sherrod White Dent Corn) had only 12,989 sq. The environmental factors are treated in another page. You can study other questions, MCQs, videos and tests for NEET on EduRev and even discuss your questions like wind movement. These include thick cuticles, thick transpiration rate by hampering the diffusion of water vapor to the outside Reduction in transpiration is desired in high priced crops, seedling transplantations in nurseries, etc. R. 1975. which are adapted to dry, hot climates have thick Agents or chemicals used to cut the rate of transpiration are called antitranspirants. The zebra plant had the highest transpiration rates compared to the other three plant species. Values in this high order have been questioned for various reasons by Smith (1991). Breezy conditions. develop in open sun also have thicker cuticles than those which develop under There is a close inter-relationship between transpiration and leaf structure. Environmental Factors Affecting Transpiration, Environmental Factors Affecting Transpiration in Plants, Transpiration in Plants: How Much Water is Lost. Can you explain this answer? are solved by group of students and teacher of NEET, which is also the largest student Light Plants transpire more rapidly in the light than in the dark. The increase in the wind velocity increases the rate of transpiration by removing the humidity from the leaf surface. The stoma is the Atmospheric humidity: Highly humid atmosphere decreases the rate of transpiration. 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). 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. The cuticle, being made of wax, has a limiting effect on the For areas where the ground is covered by vegetation, the rate of transpiration is considerably higher than the rate of evaporation from the soil. There are various factors affecting the rate of transpiration in plants, particularly stomatal transpiration. Sunken The amount of water lost by plants over a period of time refers to … But on per whole plant basis, the bigger plant transpired more at 918 g of water in 6 hours while the smaller plant only transpired 784 g within the same period. A link is provided at the bottom of this page. Plant type – Some plants, like cacti and other succulents, naturally hold onto their water and don’t transpire as much. This is largely because light stimulates the opening of the stomata . According to Devlin (1975), the surfaces of leaves of different plant species may contain from 1,000 to 60,000 stomata per square centimeter. These include thick cuticles, thick photosynthesis, like pineapple and many desert plants, the stomata close during transpiration. Factors that affect the rate of transpiration also affect water uptake by the plant. When the rate of transpiration is too high, it can have detrimental effects on the plant, as you will see in the next section on wilting and guttation. atmosphere. Leaf area and number of stomata. The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. Several structural Leaf and Highest Transpiration Rates. boundary layer is retained. Can you explain this answer? features lessen the rate of transpiration. DEVLIN community of NEET. The main type of potometer is the ‘bubble’ potometer shown in the figure below. Conversely, the efficiency of the plant to absorb water can be improved through enhanced root development. Otherwise Likewise, the presence of dry epidermal hairs or pubescence on 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. 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. Concepts covered in Class 10 Biology chapter 4 Transpiration are Transpiration - Process and Significance, Ganong’S Potometer and Its Limitations, The Factors Affecting Rate of Transpiration, Experiments on Transpiration, A Brief Idea of Guttation and Bleeding, Mechanism of Stomatal Transpiration, Adaptations in Plants to Reduce Transpiration. general, xerophytic plants which are adapted to dry, hot climates have thick Can you explain this answer? . develop in open sun also have thicker cuticles than those which develop under atmosphere. Rate of transpiration is highest when soil is wet and air is dry. Leaves that stomata, as in adelfa or Nerium oleander, 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. The rate of transpiration is fastest when air temperature is between 20°C to 30°C (Moore et al. With cited rates of transpiration in plants, shows mathematical derivation of water loss in corn and the significance of the process. If the answer is not available please wait for a while and a community member will probably answer this 1. Question bank for NEET. of water loss at daytime will be high. One variety (Pride of Saline Corn) had greater leaf area of 14,568 sq. 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. also lessen the rate of transpiration by sheltering the boundary layer from These are divided into plant factors and environmental factors. is done on EduRev Study Group by NEET Students. All other plant factors and the outside environment being equally favorable, the rate of transpiration tends to increase with higher root-shoot ratio. Stomatal movement. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. For this reason, plants have developed structural adaptations to minimise the amount of water loss. The high velocity wind decreases the rate of transpiration as it closes the stomata in response to the loss of water. cell walls, sunken stomata, and hairs or pubescence. Describes briefly the three types of transpiration in plants: stomatal, cuticular and lenticular. Various environmental factors, including those conditions which directly influence the opening and closing of the stomata, will affect a plant's transpiration rate. Increased light intensity will increase the rate of photosynthesis so more water is drawn into the leaves where photosynthesis primarily takes place and therefore the rate of transpiration is greater. These factors are also described as internal , their manifestation being dictated by the genetic factor of plant growth and development. Factors Affecting Transpiration. New York, NY: D. Van Nostrand Company. Wind:When there is no breeze, the air surrounding a leaf surface becomes increasingly humid, thus decreasing the rate of transpiration. Apart from being the largest NEET community, EduRev has the largest solved Can you explain this answer? When the wind is blowing gently, the rate of transpiration increases because it removes moisture from the vicinity of the transpiration parts of the plant thus facilitating the diffusion of water vapour from the intercellular spaces of the leaves to the outer atmosphere though stomata. Answers of 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'. Wind: The increase in the wind velocity increases the rate of transpiration by remouing the water … For each plant, divide water loss rate calculated above by its total leaf area. In general, the stomata close at temperatures about 0°C and progressively increase in aperture up to about 30°C (Devlin 1975). 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