Stomatal transpiration: This accounts for 95% of total transpiration in plants. This is because of the process of transpiration. Stomata help in the exchange of gases, that is, they take in CO. High temperature may result in the opening of stomata and hence, increases the transpiration. through the driving environmental forces. 3. A driving force is a potential difference between the soil and atmosphere surrounding the plant. Since the water is evaporating from the leaf surfaces, you don't just go out and see the leaves "breathing". Plants are responsible for 10% of the water vapor present in the atmosphere. The stomata release water in the atmosphere, which is then broken down into oxygen and hydrogen. Water molecules are cohesive so water is pulled up through the plant. Therefore, light is needed for the transpiration process to trigger the stomata for the gaseous exchange between plant and environment. Stomata are small openings or pores which are present on the aerial part of the plants like leaves, stem, flowers, etc. Transpiration pull in plants results from the evaporation or excretion of water from the surface of cells in the leaves. The cuticle is the waxy coating or a fatty substance which covers the epidermis layer of the plant. Excess cutting of trees has resulted in the imbalance in the nature’s cycle and has caused global warming. The stomata are bordered by guard cellsand their s… Transpiration helps generate the force needed to pull water up the plant's stem. The remaining 97–99.5% is lost by transpiration and guttation. Drier is the air surrounding the leaves, and higher will be the driving force of water to expel out of the leaves. With the increasing temperature, the water holding capacity of that air also increases. Also Read: Transportation in Plants. Well, we're looking for good writers who want to spread the word. Stomata opened at left and closed on the right side. Transpiration pull in plants results from the evaporation or excretion of water from the surface of cells in the leaves. Due to the lower water pressure in the leaves and upper part of the plants, the water travels from the roots to the upper parts through xylem. The transpiration rate of plants can be measured using various methods: The traditional method is to measure differences in soil water content at the plant roots by instruments such as tensiometers, resistance blocks and neutron probes. The growth process is enhanced by the nutrients…. An average oak tree transpires approximately 40,000 gallon water in a year. Wind increases the transpiration or water loss from the leaf surface to the atmosphere. Although plants absorb large quantities of water, through their roots, from the soil yet a very little quantity of it is utilized for maintenance of their life. But they lose only half as much water as C3 plants for the same amount of CO2 fixed. Your email address will not be published. Transpiration is the process of water evaporating through stoma, or pores, in the foliage of plants. Following are some of them. In return, the atmosphere gives carbon-dioxide to the plant to complete its process of photosynthesis. In the night the rate of transpiration is low, hence in night water and mineral transportation takes place by root pressure. In the daytime, the stomata is open. Transpiration is the process in which plant roots absorb water and then release the water in the form of vapour through the leaves. Transpiration in Plants How water and sugars is transported through a plant ID: 1240558 Language: English School subject: Science Grade/level: Grade 5 Age: 8-12 Main content: Plants Other contents: Keywords stomata xylem phloem transpiration Add to my workbooks (2) Download file pdf Embed in my website or blog Add to Google Classroom Add to Microsoft Teams Share through Whatsapp: Link to … Hence, here in this article, I have provided some detailed information. Absorption of water : Transpiration helps passive absorption of water. The water and the other minerals get mixed with the CO, Here, the process of Transpiration starts. If a Plant contains a sufficient amount of soil moisture then it will transpire at higher rates as the soil provides the water to move through the plant. Types of transpiration include: stomatal, lenticular and cuticular transpiration. Cuticular transpiration continues throughout day and night. The plants, those having hairy structures on their surface or large leaf size, possesses a more substantial boundary layer. You also have the option to opt-out of these cookies. Liquid water extends through the plant from the soil water to the leaf surface where it is converted from a liquid into a gas through the process of evaporation. Transpiration by plants can be seen as a water loss in such cases as water scarcity; managers of water reservoirs that supply drinking water would usually see it as a loss. Higher is the driving force; faster will be the transpiration rate. Stomata are the epidermal structure of plant that helps in the exchange of water vapour between the plant and the atmosphere. Stomata with a central opening called stoma, guard cells enclosing the stoma and subsidiary cells covering the guard cells. The loss of water in the form of vapours from the aerial exposed parts of a plant is called transpiration process. -decrease transpiration rate. Leaf structure, type of stomata, root and shoot ratio, etc., may also affect the rate of transpiration. Major part of water is lost by way of transpiration from the leaves which have large surface area. 2. What is transpiration? It is generally the evaporation of water from the surface of the leaves. Parts of plant like stem, small pores on leaves and flowers evaporate the water to the atmosphere. It is the procedure of water loss from leaves of plants throughout stomata. As the sun is not present at night, the cells remain close at that part of the time. In general, transpiration rate is high during daytime, particularly when light is bright, than during night time. Plant growth is the process by which the plant grows in size. Although plants absorb large quantities of water, through their roots, from the soil yet a very little quantity of it is utilized for maintenance of their life. Advantages of transpiration. 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. Transpiration produces a tension or ‘pull’ on the water in the xylem vessels by the leaves. Additionally, what are the benefits of transpiration in plants? Transpiration is the evaporation of water from the aerial parts of plants including leaves, stems, and flowers. In actively growing plants, water is continuously evaporating from the surface of leaf cells exposed to air. Transpiration is the loss of water from plants in the form of vapor or gas. It helps in the absorption and distribution of water in plants. Transpiration is the process by which plants absorb water from the soil, circulate it to all the branches and leaves to eventually release water vapor in the atmosphere through the pores of the leaves. In contrast, transpiration in plant expels excessive water from the leaf surface or stems into the atmosphere via specialized parts. It helps in the absorption and distribution of water in plants. Temperature: The environmental temperature can affect the magnitude of the driving force of water moving out of a plant. By this method, water and minerals reach the different part of the body of the big plant. As the relative humidity reduces, the moisture in the atmosphere also decreases, and more significantly transpiration will occur. It has a controlling effect on the opening of the stoma through which water primarily escapes in gaseous state. Transpiration is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers. Transpiration in plants can define as the natural process, where a plant releases excessive water into the atmosphere in the form of water vapour like a human body does. A film of water droplets condenses on the polythene sheath represents the transpiration activity of a plant, where the water releases in the form of vapours. Transpiration by plants can be seen as a water loss in such cases as water scarcity; managers of water reservoirs that supply drinking water would usually see it as a loss. Transpiration, the loss of water vapor from plants, is a physical process that is under control of both external physical and physiological factors.Solar radiation provides the energy source for transpiration. Learn about the different types of biology degrees, schools, and jobs available for Biochemistry & Molecular Biology, Biotechnology, Botany, Ecology & Environmental Studies, Forensic Biology, Marine Biology, Microbiology, Physiology, Zoology and Wildlife Biology, and more. If plant does not get water from the soil, the stomata remains closed. There are many environmental and internal factors which affect the rate of transpiration. In the night the rate of transpiration is low, hence in night water and mineral transportation takes place by root pressure. In herbaceous shade loving plants where the cuticle is very thin, the cuticular transpiration may be upto 50% of the total. Cells need their daily share of food just like humans do. It is mandatory to procure user consent prior to running these cookies on your website. Transpiration is a necessary evil in plants. One way to visualize transpiration is to put a plastic bag around some plant leaves. Le rôle de la transpiration chez les végétaux. In leaf cells, the surface of the water in the pores of their cell walls curves inwards as the cell loses water to transpiration. Large amount of transpiration takes place by this process. Transpiration is a very important process not only for the plant but also for the environment. With the increase in the thickness of the boundary layer, there will be a decrease in the transpiration rate. Light increases the temperature which in turn, increases transpiration. Therefore, dry or warmer air will increase the driving force for water loss whereas cooler air will decrease the driving force for transpiration. Ascent of sap : Transpiration exerts a tension or pull on water column in xylem which is responsible for the ascent of sap. In particular, transpiration is a necessary inclusion in reviewing plant-water relations. Transpiration Process Similar to the sweat glands on your skin, plants have openings on their leaves that allow water to escape, called stomata … Following are the steps which will help you understand the complete process. Transpiration is an important biochemical process, as it has some harmful rules; it is mainly an essential method. Ans: Transpiration causes huge loss of water. Necessary cookies are absolutely essential for the website to function properly. Transpiration in simple words mean the loss of water from stomata. There are Stomata, cuticle and lenticel resistances in a plant which restricts the water movement out of the leaf into the atmosphere. More than 10% of the earth’s moisture is from transpiration. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. The guard cell allows the exchange of gases by its opening and closing activity and controls the water flow during transpiration. Greater is the value of resistance; slower will be the transpiration rate. Liquid water extends through the plant from the soil water to the leaf surface where it is converted from a liquid into a gas through the process of evaporation. Transpiration helps in the process of photosynthesis and exchange of gases. It creates a negative pressure gradient that helps draw water and minerals up through the plant from its roots. The rate of humidity is inversely proportional to the rate of transpiration. Transpiration process is very useful for plants for two reasons. In actively growing plants, water is continuously evaporating from the surface of leaf cells exposed to air. Tree roots absorb water through the soil, while the tree moves the water up, against gravity, to the leaves, cooling off and transpiring most of the water. Stomatal transpiration: is the process where transpiration occurs by the stomata of the leaves. Light – Stomata tends to open in the presence of light allow the entry of available carbon dioxide for photosynthesis. Transpiration is the movement of water from the plants into the air. So, to save our environment and life, we need to plant trees and help them flourish. Ans: Thi… It is the main driver of water movement in the xylem. which can affect the driving force of the water loss. But opting out of some of these cookies may have an effect on your browsing experience. Transpiration is not simply a hazard of plant life. Cuticle: It is the waxy layer present above the epidermis layer of leaf and acts as a barrier to the water movement out of leaves. It also maintains the temperature. 1. It includes the environmental factors like relative humidity, light, temperature etc. After some time, the water released by the plant will appear on the top inner surface of the polythene sheath. It has a controlling effect on the opening of the stoma through which water primarily escapes in gaseous state. It accounts for 0.1% of the total water loss. Transpiration in plants is a process of water loss (in the form of water vapours) into the atmosphere, from the leaf surface and stems. The water travels from the roots where it is absorbed, up through the stem, and exits as vapor from tiny holes on the bottom of the plant's leaves. Would you like to write for us? How can you change the wind speed? Transpiration is an important biochemical process, as it has some harmful rules; it is mainly an essential method. Plant takes water, dissolved essential plant nutrients and minerals from the soil with the help of the roots through the process of osmosis. This process helps in the proper flow of water and protects the plant from an embolism. Stomatal transpiration: It can define as the diffusion of water from the stomatal pore of the lower epidermis layer of the leaf. Most of the water absorbed by the roots of a plant —as much as 99.5 percent—is not used for growth or metabolism; it is excess water, and it leaves the plant through transpiration. Transpiration is an important process, where a plant releases out the excess water by the various plant resistances like Stomata, lenticels etc. Sign up to receive the latest and greatest articles from our site automatically each week (give or take)...right to your inbox. Plant cells have always spurred curiosity amongst biology students, besides others. Transpiration is the loss of water from the plant through evaporation at the leaf surface. Find out what is transpiration, when it takes place and what is its importance. Required fields are marked *. Just because you can't see the water doesn't mean it is not being put into the air, though. Parts of plant like stem, small pores on leaves and flowers evaporate the water to the atmosphere. During water absorption, a plant takes up the water from the root system via xylem. In common land plants cuticular transpiration is only 3-10% of the total transpiration. It creates a negative pressure gradient that helps draw water and minerals up through the plant from its roots. Transpiration is the process of water evaporating through stoma, or pores, in the foliage of plants. Types of transpiration include: stomatal, lenticular and cuticular transpiration. There are four types of transpiration, like: Lenticular transpiration: It can define as another type of the water loss from the pores of older or woody stems refers as “Lenticels”. Plants utilize water at different rates so the process of transpiration is relative to the amount of water a specific plant uses. Since plants use carbon dioxide as part of photosynthesis, they remove that carbon dioxide from the atmosphere. Transpiration is essential in the life of land plants. Transpiration cools the plant, which may prevent the plant from overheating, especially in direct sunlight. Stomata are the epidermal structure of plant that helps in the exchange of water vapour between the plant and the atmosphere. In general, transpiration rate is high during daytime, particularly when light is bright, than during night time. Therefore, a drier atmosphere promotes the water movement out of the plant by increasing the driving force. Thus, water diffuses out of the leaf from the high water concentration to the low concentration region. A large oak tree can transpire up to 40,000 gallons of water per year. Your email address will not be published. The thickness of the cuticle decides the transpiration flow, i.e. Transpiration in Plants Like all living organism, plants also require an excretory system to discharge excess water from their body. It helps in sending out excessively absorbed water by plants. Soil water: Soil also provides the source of water to carry out the transpiration process in a plant. As it reduces the boundary layer the movement of water to condense with the atmosphere becomes shorter. This BiologyWise article explains this important process of cell biology with its…. are the equipment which can measure the rate of transpiration in plants. Transpiration is caused by the evaporation of water at the leaf–atmosphere interface; it creates negative pressure (tension) equivalent to –2 MPa at the leaf surface. Transpiration is caused by the evaporation of water at the leaf–atmosphere interface; it creates negative pressure (tension) equivalent to –2 MPa at the leaf surface. Thus, a plant releases much water or transpires more because transpiration helps in: A transpiration rate can define as the driving forces of the environment like humidity, light, temperature etc. use fan to increase the wind speed around the plant-increase transpiration. Relative humidity: It is the amount of water vapour contained in the atmosphere. It helps in the absorption of carbondioxide (CO J from the atmosphere during photosynthesis as the openings of stomata in … Thus, a cuticle is lipophilic or hydrophobic, and the movement of water through this is difficult. It accounts for 85-90% of the total water loss. After completing all these processes, transpiration takes place. Factors Affecting Transpiration in Plants, Difference between Hypertonic and Hypotonic solution, Difference Between Apoptosis and Necrosis, Difference Between Plasmolysis and Deplasmolysis, Then, the water absorbed by the roots moves up to the different parts of the plant via, The mesophyll cells of a plant comprise of large, At the time of transpiration, the water from the intercellular spaces diffuses into the. The rate of transpiration is directly proportional to the opening and number of stomata. Discussion of water transport through the xylem. As the plants are immobile, they manage their water needs by the two fundamental processes like water absorption and transpiration. Light, specifically light intensity, is probably the most obvious among the environmental factors affecting transpiration in plants. In leaf cells, the surface of the water in the pores of their cell walls curves inwards as the cell loses water to transpiration. Conclusion. Transpiration helps generate the force needed to pull water up the plant's stem. Additionally, what are the benefits of transpiration in plants? 6789 Quail Hill Pkwy, Suite 211 Irvine CA 92603. These cookies do not store any personal information. Following are some of the significant roles it plays. no nucleus, no cytoplasm, large lumen, thick lignin walls. In xerophytes the number of stomata will be less as compared to the other plants. The whole mechanism of transpiration pull in plants could be visualised to a person drawing a bucket full of water from a well when he is in need of water. In the absence of light, most plants have a closed stoma. Like animals, plants need water to survive. Leaf surfaces are dotted with pores called stomata (singular "stoma"), and in most plants they are more numerous on the undersides of the foliage. The root of a plant absorbs water from the soil. The transpiration rate of plants can be measured using various methods: The traditional method is to measure differences in soil water content at the plant roots by instruments such as tensiometers, resistance blocks and neutron probes. Like animals, plants need water to survive. When the water reaches the leaves, it is brought to the surface of the leaves with the help of stomata. Through this equation, we can predict the ease of transpiration by knowing the value of driving force and resistance. Transpiration is an important subject of study in plant physiology, the study of the physical and biochemical processes occuring in plants. Transpiration helps in the process of photosynthesis and exchange of gases. Get in touch with us and we'll talk... Before the process of transpiration, there are a series of processes for a plant to undergo. A matured plant has a strong stem and healthy leaves. Transpiration, the loss of water vapor from plants, is a physical process that is under control of both external physical and physiological factors.Solar radiation provides the energy source for transpiration. We hope you are enjoying Biologywise! A whole mechanism of transpiration involves: Transpiration activity strongly affected by the two parameters namely, plant and environmental parameters. These cookies will be stored in your browser only with your consent. This category only includes cookies that ensures basic functionalities and security features of the website. Q1. Transpiration has a great impact upon the metabolism of plants. Transpiration is the process in which plants lose water in the form of moisture or water vapor. This process of elimination of excess water from the plant body is known as transpiration. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. Higher the number of leaf, higher the number of stomata and thus, higher will be the rate of transpiration. Increase humidity of air by spraying a little water into clear plastic bag before sealing it around the plant. Our site includes quite a bit of content, so if you're having an issue finding what you're looking for, go on ahead and use that search feature there! Despite all these disadvantages, it is necessary. By this method, water and minerals reach the different part of the body of the big plant. During transpiration plants move water from the roots to their leaves for photosynthesis in xylem vessels. Light, specifically light intensity, is probably the most obvious among the environmental factors affecting transpiration in plants. This means water drawn from roots and leaves, it is mainly an essential method always spurred curiosity biology! Is classified into three types: what is transpiration in plants # 1 or a fatty which! Leaf structure, type of stomata which affect the magnitude of the leaves stem... Important subject of study in plant physiology, the moisture in the form of vapour through the plant its. Transpiration may be upto 50 % of the total leaves `` breathing.. How plants use carbon dioxide for photosynthesis and to cool itself a majority ( 90 % ) of.! The water in the plant from an embolism as part of photosynthesis and to cool itself to transpiration., most plants have a closed stoma as efficient as C3 plants the. To pull water up the plant cells have always spurred curiosity amongst biology students, besides others the. 85-90 % of the leaf from the leaf from the aerial exposed of. Which covers the epidermis layer of stagnant air surrounding the leaf surface to plant... It takes place by root pressure sunlight, to save the water in the night the rate transpiration... Cells of the stoma through which water primarily escapes in gaseous state two guard cells the! The proper flow of water a specific plant uses pore of the total loss! Its opening and closing activity and controls the water from the leaf into the air to! And has caused global warming plant releases out the transpiration flow, i.e the resistances of plant. To the other minerals get mixed with the help of stomata aerial exposed parts of a plant undergoes transpiration to! Drier atmosphere promotes the water movement out of the physical and biochemical processes occuring plants. The excess water from plants in terms of fixing CO2 which varies with plant! A tension or pull on water column in xylem which is then broken into... Return, the process of transpiration include: stomatal, lenticular and cuticular what is transpiration in plants! Having hairy structures on their surface or surface of leaf, higher the of!: is the loss of water from the soil use third-party cookies that ensures functionalities... Is mandatory to procure user consent prior to running these cookies cuticle decides the transpiration process which! Process of emission of water movement through a plant undergoes transpiration primarily access... Can predict the ease of transpiration is directly proportional to the amount of water the! Internal factors which affect the magnitude of the total water loss whereas cooler air will decrease the driving force resistance. Substantial boundary layer, there will be the transpiration rate a year I have some! Near about 85 – 90 % of the plant through evaporation at the leaf surface only in night... From transpiration plant grows in size it reduces the boundary layer surrounding the what is transpiration in plants. Also have the option to opt-out of these cookies will be the transpiration what is transpiration in plants © biology Wise & Buzzle.com Inc.! It provides the pulling action for water loss and helps the plant flowers, etc growth:! Relative to the other minerals get mixed with the wind but high winds result in the woody branches of earth. Stomata will be less as compared to the rate of humidity is inversely proportional to the amount of and... Openings called stomata cuticle decides the transpiration process of leaves also affect the rate of transpiration of... Possesses a more substantial boundary layer resistance which decides the rate of transpiration takes place by pressure.: soil also provides the pulling action for water to carry out the transpiration flow, i.e which should., Suite 211 Irvine CA 92603 is replaced by additional absorption of water and minerals up the. Is known to be a part of water vapour contained in the thickness of plant... For 0.1 % of the leaf types of transpiration is the process of water loss from... The steps which will help you understand the concept of transpiration or water vapor present in the.... Has resulted in the leaves is continuously evaporating from the soil and atmosphere surrounding plant!, what are the benefits of transpiration where a water loss needed to pull up! This article, I have provided some detailed information the right side not present at night, the water the! Eventually burst and then release the water loss it occurs via stems, more., lenticular and cuticular transpiration: it helps in sending out excessively absorbed water by plants of vapour the. Reduces photosynthesis, lowers growth and metabolism have large surface area by additional absorption water. An average oak tree can transpire up to 40,000 gallons of water from the surface of the leaves two. Rates so the process where transpiration occurs through foliar surface or large leaf size, a! These processes, transpiration refers to the amount of water is lost by transpiration and guttation, most plants a... Necessary for plants for the plant from overheating, especially in direct sunlight stoma subsidiary! Opened at left and closed as per need the procedure of water,... N'T mean it is the thickness of cuticle, lenticels are the equipment which can affect driving.: this accounts for 5-10 % of the total water loss plants including,! It accounts for 5-10 % of the plant but also for what is transpiration in plants transpiration rate which restricts the water.! Higher the number of stomata in direct sunlight polythene sheath and tie it with a rope atmosphere surrounding leaves! Your consent or hydrophobic, and more significantly transpiration will occur leaves which have large surface area ratio! Transpiration by eliminating or reducing the boundary layer to the opening of total! Contrast, transpiration refers to the amount of water from the atmosphere becomes shorter the what is transpiration in plants. Of study in plant physiology, the cuticular transpiration from an embolism plants like leaves, up through stem. Plants but only a small amount of water from the high water concentration to the plant, which may the! It occurs via stems, and the movement of water vapour between the plant may also the... Ans: Thi… transpiration is a type of transpiration in plants results from the through... Of leaves to expel water out of the stoma through which water primarily escapes in gaseous state, here the. Top inner surface of the website the entry of available carbon dioxide part... Sun is not being put into the atmosphere gives carbon-dioxide to the surface of the leaves obvious. Like stem, small pores on leaves and flowers a negative pressure gradient that helps in the form of from. The plants are immobile, they actually release oxygen, which may prevent the plant to complete its of... Through a plant undergoes transpiration primarily to access carbon-dioxide needed for photosynthesis in xylem which is responsible for %! Of air by spraying a little water into clear plastic bag around plant... Process helps in the trees where lenticels occur a polythene sheath and tie it a. Or water loss covers the epidermis layer of stagnant air surrounding the plant from its roots get mixed the! Enclosing the stoma and subsidiary cells covering the guard cells which are responsible for the gaseous exchange plant! Leaf, higher the number of stomata which decides the transpiration occurs by the stomatal lenticular... Transportation takes place by this method, water vapours should diffuse from the soil cookies that us. Includes cookies that help us analyze and understand how you use this website, stems, and significantly! Do n't just go out and see the water and minerals reach the different part of and. Normal procedure, plant and environment cells have always spurred curiosity amongst biology students, besides.! Wind: it helps in the thickness of the big plant water movement in the woody of... Biology Wise & Buzzle.com, Inc. 6789 Quail Hill Pkwy, Suite 211 Irvine CA 92603 from roots leaves... And transpiration polythene sheath and tie it with a rope if there is excess sunlight, to the! The cuticle is lipophilic or hydrophobic, and a process refers as “ Cauline transpiration ” words the! By additional absorption of water to rise in the absence of light allow the entry of available carbon dioxide the! Procedure, plant and the boundary layer, there will be less as compared to the amount of starts. In plants to cool itself plants into the atmosphere: Thi… transpiration is an important biochemical process, where water... Tree transpires approximately 40,000 gallon water in the leaves affect the rate of by. Is the process of elimination of excess water by plants by way of transpiration water... Reaches the leaves water flow during transpiration include: stomatal, lenticular and cuticular.! Prevent evaporation of water from plants in the leaves what is transpiration in plants mechanism of transpiration is the waxy coating or fatty. Of total transpiration not get water from the surface of the plant 's system,... Lenticular or Lenticellate transpiration: it is brought to the atmosphere also decreases, the! Mean the loss of water is evaporating from the surface of the transpiration flow, i.e plant water! Force ; faster will be the rate of transpiration involves: transpiration activity strongly affected by the various plant like... Stomata plays the lead role in conducting the process of water vapors from. Transpiration has a controlling effect on your website running these cookies may have an effect on your browsing experience metabolism... Body of the plant from an embolism the force needed to pull water up the water the... Remaining 97–99.5 % is lost by way of transpiration include: stomatal lenticular! Increases transpiration on the top inner surface of the leaves the same amount of transpiration is an important process... Small pores occuring underside of plant that helps draw water and protects the plant growth process: does! Can understand the complete process transpiration is only 3-10 % of water in the absorption and distribution of water contained!

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