...Transpiration and Leaf Resistance By: Bernina Berber Due: February 24, 2011 Lab: Thursday 1:40pm Section: 15227 Introduction Transpiration is a part of the water cycle process, and it is the loss of water vapor from parts of the plants. It is a process similar to evaporation. Evaporation and diffusion cause the plant tissue to have negative water potential. If you were to compare transpiration it would be like saying it is close to sweating (but in plants), especially in leaves but also in stems, flowers and roots. Stomata are dots with openings on top of the leaves surfaces, which in many plants have numerous on the undersides of the foliage. The stomas are boarded by guard cells that open and close the pore. Leaf transpiration happens through stomata, it is considered as a necessary need associated with the opening of the stomata to allow the diffusion of carbon dioxide gas from the air for photosynthesis. Transpiration is very important for plants because it cools them and enables the mass flow of mineral nutrients and water from roots and shoots. The amount of water vapor within the plant tissue, air humidity, and air temperature all play a roll in the rate of transpiration. The rate of transpiration can be measured using the mass of water lost per unit area of leaf tissue relative to time. When you take a leaf from a plant it is obvious that water is lost from the tissue, however it has no source of water to compensate for its negative water potential, which keeps...
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...conditions. Most water lost from plants is in the form of water vapour that diffuses out of the leaves through the stomata during the process of transpiration. Transpiration may also take place through the cuticle. The plant cannot stop all loss of water vapour as this would prevent diffusion of oxygen & carbon dioxide during respiration and photosynthesis. The following characteristics are typical of xerophytic plants and help to prevent moisture loss and to store available water: Roots: The roots have large capacity for storing water along with deep taproots. This allows them to take up as much as water as possible and store it for a long time. They also have wide-spreading roots near the soil surface which means they are able to spread widely in search of sources of fresh water. Leaves The leaf is the part of the plant where the greatest amount of transpiration takes place. A xerophytic plant may have any of the following leaf characteristics to help reduce transpiration while still being able to photosynthesise: They might have shiny white leaves with thick, waxy cuticle which is reflective and reduces evaporation and therefore limits transpiration. Additionally, certain plants have fewer leaves with smaller surface area which limits area of transpiration and also less leaves to transpire. Leaves of certain xerophytes stop growing during the dry season therefore greater moisture conservation. Rolled leaves can also be found in xerophytes to reduce leaf area exposure....
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...experiment to show that starch is formed as a result of photosynthesis (testing for starch in a green leaf). It would talk about the aim, list of all apparatus needed and the different methods used. It would also illustrate the three conditions necessary for photosynthesis that is, if carbon dioxide, sunlight and chlorophyll are necessary for photosynthesis. In addition, a test would be carried out to demonstrate that starch is formed as a result of photosynthesis. Last but not the least, outcomes expected from each test carried out would be given in this report after each investigation is done. Plan Plan is to research on relevant information for my project and to produce a written report at the end. I would be researching about the apparatus and equipments that are required for the experiment. Would ensure good lab practice is followed at all times when a test is being carried out. I would research on methods or procedures that are needed to carry out the experiment. Again would be carrying out practical work in each session to improve the design of the project. I would also research on conditions necessary for photosynthesis, which is to investigate the need for carbon dioxide in photosynthesis. Last but not the least; investigate if the necessity of sunlight and chlorophyll are necessary for photosynthesis. Aim The aim of this experiment is to show that starch is formed in a leaf as a result of photosynthesis. Apparatus/Materials Iodine solution, 2 small leaves from dicotyledonous...
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...well as the stomatal conductance. Although the average rate of transpiration and stomatal conductance were lower for the branch exposed to wind, there was no significant difference between the treatment and control group data sets to suggest a direct relationship. Introduction Plants are able to take in water and move it throughout its systems through the process of transpiration, in which moisture is carried from the roots to the leaves to be evaporated out through the stomata. Water loss through transpiration is crucial for plant survival as it allows them to cool their temperature, as well as increase their nutrient intake as additional water is absorbed to compensate for the loss. Although most of the water absorbed from the soil is lost through transpiration, plants utilize a small percentage of water to undergo photosynthesis. The energy required to carry out both transpiration and photosynthesis is obtained from sunlight, which can have a direct effect the transpiration rate. Plants are at a higher risk of wilting in hot, sunny weather due to the increase in rate of transpiration and lack of water abundance (Ku et al., 1977). Plants accommodate the temperature increase in warm climates by opening their stoma to release water into the atmosphere. While sunlight and temperature have well documented effects on transpiration rates, wind also has an effect on the rate of transpiration. Caldwell, in his 1970 study, found that the stomata of evergreen shrubs immediately closed...
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...In this experiment, two different tree species, namely speckled alder (Alnus incana subsp. rugosa) and white birch (Betula papyrifera), were studied and observed under multiple parameters in two sites – the lowland and upland, respectively. Students were divided randomly into four groups: decomposition, leaf, arthropod, and environment, and tasked with measuring specific phenomena. The decomposition group investigated the decomposition of leaves in litter bags over time, the leaf group observed changes in leaf herbivory by insects and leaf senescence, the arthropod group investigated the diversity of arthropod communities at both sites, and the environmental group examined abiotic conditions such as soil pH and composition, temperature and...
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...ENVS 1500 – Assignment #1 Leaf Decomposition Working Hypothesis: Different tree species leaves will not decompose at different rates. AND Different tree species will not harbour different soil animals. Decomposition Rates: ln (Mo÷Mt) = k × t Maple: t = 42/365 = 0.11506849 Mo = 0.780769231 Mt = 0.569230769 Isolate for k. ln (0.780769231 ÷ 0.569230769) = k × 0.11506849 ln (1.37162162258309) = k × 0.11506849 0.315993705978644 ÷ 0.11506849 = k k = 2.746135853339551 European Buckthorne: t = 42/365 = 0.11506849 Mo = 0.418181818 Mt = 0.154545455 Isolate for k. ln (0.418181818 ÷ 0.154545455) = k × 0.11506849 ln (2.705882343806228) = k × 0.11506849 0.99542804905692 ÷ 0.11506849 = k k = 8.650743996526937 Figure 1.1: Organisms Observed (Maple Leaves): Species Name | Taxonomic Category | Role in Food Webs | Fire Ant | Hymenoptera | Omnivore | Common Centipede | Scutigeromorpha Pocock | Carnivore | Earth Worm | Megadrilacea | Decomposer | Earwig | Dermaptera | Carnivore / Herbivore (less common species) | Sow bug (Woodlouse) | Isopoda | Decomposer | Termite | Isoptera | Herbivore / Decomposer | Daddy Long Leg | Pholcidae (Araneae) | Carnivore | Common Ant | Formicidae | Herbivore | Millipede | Diplopoda | Herbivore / Decomposer | Aphids | Hemiptera | Herbivore | Garden Spider | Araneae | Carnivore | (ITIS, 2013) (Evans, 2007) (CISEO, 1997) (Meyer, 2007) Figure 1.2: Organisms...
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...1mL 7.6mL 3.2mL 2. Transpiration is the process of moisture carried through plants from roots to small pores on the bottom side of leaves, where it changes to vapor and is released to the atmosphere. In our experiment, transpiration is the passage of watery vapor from a living plant through a membrane or pores. 3. If the air flow is directed onto the upper surface, then the transpiration rate would be smaller compared to the original result. 4. Light and fan variables would lose the most mass through transpiration and the fan and mist variables would lose the least amount, with room condition in the middle. Light and fan variables lost the most amount of mass because sunlight promote photosynthesis to occur and wind causes the emission of water to occur due to a lower water potential outside the flower. The dark and mist variables lost the least amount of mass because transpiration was kept to a minimum due to lower water potential in the plant and no need to follow through with photosynthesis. The room condition remained in the middle of the mass loss because it was the constant variable and there were no influences for or against transpiration, allowing the natural rate of transpiration to take place. The room condition remained in the middle of the mass loss because it was the constant variable and there were no influences for or against transpiration, allowing the natural rate of...
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...Introduction 1. Transpiration is “the uptake of water by plant roots, transport through the plant and evaporation from the leaf through pores called stomata” (Roberts et al., 2006). Transpiration is important because it enables the plant to absorb nutrients while taking up water and the effect of evaporation prevents the temperature within the plant from reaching “supra-high levels” (Roberts et al., 2006). 2. Plants regulate transpiration through “partial or complete stomatal closure” (Roberts et al., 2006). 3. Transpiration is affect by many abiotic factors such as “water stress, flooding, light intensity, high temperatures, cold and freezing” (Nilsen and Orcutt, 1996). Water Stress refers to drought conditions which can lead to dehydration of vegetation. Flooding can cause the nutrients to be washed away as well as smother the plant roots. High light intensity could cause irreparable damage to the leaves due to radiation where as low light intensity could inhibit photosynthesis. Under freezing conditions, water will turn to ice which prevents the plant from absorbing it. Also, as water becomes ice, the volume will expand and can cause physical damage to the plant itself. High temperatures increases evaporation of water and can lead to the plant dehydrating. In our experiment we will be exploring the abiotic factors heat as well as humidity, closed stomata, and surface area of the leaves. Humidity can affect transpiration because under high humidity, the water...
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...The Last Leaf Many artists lived in the Greenwich Village area of New York. Two young women named Sue and Johnsy shared a studio apartment at the top of a three-story building. Johnsy's real name was Joanna. In November, a cold, unseen stranger came to visit the city. This disease, pneumonia, killed many people. Johnsy lay on her bed, hardly moving. She looked through the small window. She could see the side of the brick house next to her building. One morning, a doctor examined Johnsy and took her temperature. Then he spoke with Sue in another room. "She has one chance in -- let us say ten," he said. "And that chance is for her to want to live. Your friend has made up her mind that she is not going to get well. Has she anything on her mind?" "She -- she wanted to paint the Bay of Naples in Italy some day," said Sue. "Paint?" said the doctor. "Bosh! Has she anything on her mind worth thinking twice -- a man for example?" "A man?" said Sue. "Is a man worth -- but, no, doctor; there is nothing of the kind." "I will do all that science can do," said the doctor. "But whenever my patient begins to count the carriages at her funeral, I take away fifty percent from the curative power of medicines." After the doctor had gone, Sue went into the workroom and cried. Then she went to Johnsy's room with her drawing board, whistling ragtime. Johnsy lay with her face toward the window. Sue stopped whistling, thinking she was asleep. She began making a pen and ink drawing for a story...
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...Plants General Characteristics: * Multicellular, primarily terrestrial eukaryotes with well developed tissues * Autotrophic by photosynthesis * Chlorophyl a and b , carotenoids etc. * Store starch in chloroplast * Cell wall – cellulose * Protect the embryo from drying out by providing it with water and nutrients within the female reproductive structure * Alternation of generation’s life cycle ( sporophyte and gametophyte phase) Main Division: 1. Non Vascular * Lack vascular tissues * No true roots, stems and leaves * Rootlike, stemlike, and leaflike structures * Usually small * Found in moist habitat * Example: hornwort, liverwort, mosses 2. Vascular * Seedless * Include the ferns * With vascular tissues * With true roots, stems and leaves * Seed * Gymnosperm (naked seed) and Angiosperm (enclosed seed) * With vascular tissue * With true roots, stems and leaves * Gymnosperms * Cone bearing plants * Conifers * Cycads * Ginkgo * Gnetophytes * Angiosperms (Flowering Plants) A. Dicot (class Magniliopsida) * More primitive than monocots * Embryo has two cotyledon * Floral part’s in 4’s or 5’s or multiples of 4’s or 5’s * Mostly woody, some herbaceous stems * Oval or palmate leaves with netlike venation * Taproot system A. Monocot (class Liliopsida) ...
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...To be perfect short story neatness, brevity and a significant incident or an aspect of character or an experience of some psychological moment is essential. Within its short frame work, it must have a beginning, middle and an end. There must be completeness in its structure. All the elements plot, character, dialogue, descriptions and background must be organically connected with other. Generally a good story has a surprising end which bears a sense of endlessness. All these characteristics of a good short story are fulfilled in the short story of O Henry’s The Last Leaf. It has an ironical twist at the end that is surprising and at the same time striking to the readers. Old Behrman’s bold self sacrifice for the young Johnsy comes unexpectedly to the readers, but none the less convincing and admirable.The story if farther a parable of christian story of Resurrection and sacrifice. The story begins in a leisurely manner with the sketchy background. The old Greenwich village in which painters come to set up their art studio has curious maze streets criss-crossing one another. A traveler loses the directions of the streets. This description of the streets has relevance to the story in which a strong and strange psychological morbidity is focused. The main theme is then introduced it has two characters – Sue and Johnsy. They met together suddenly at a hotel and found themselves sharing taste chicory salad, bishop sleeves and in painting. They become intimate friends and in a cheap...
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...Running head: Three Science Lessons Three Science Lessons Sherry Pate Grand Canyon University EED 364 May 1, 2011 EEI Lesson Plan Student name: Telephone: Website: Implementation Date: |VITAL INFORMATION | |Author |Sherry Pate | |*Subject(s) |Science, Technology | |Topic or Unit of Study |Classification of plants and animals | |*Grade/Level |4th Grade | |*Summary |The students will learn how to classify plants and animals into groups based on their characteristics. | | |Some of the characteristics that students will look for include plants, animals, things, that lay eggs, | | |things that live underwater, etc. Students will be able to visualize and know that sometimes plants and | | |animals can be classified into more than one group depending on the features of the specific groups. ...
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...The last leaf “The Last Leaf” - The Hope That Heal. "The Last Leaf" by O. Henry is an interesting short story about a sick girl named Johnsy, who is deeply affected by a bare vine tree. Johnsy has decided she will not get well and has reconciled herself with the fact that she is going to die when the last leaf falls off the ivy bush outside her bedroom window. Johnsy's hopelessness and willingness to accept the worst without a fight is a major statement about the emotional state of the character. In his wonderful short-story “the last leaf”, using sacrificial themes, fear of pneumonia and a twist on the fatalistic tone, O.Henry depicted a really meaningful goal: Life must have hope. In brief, I love this story very much. Its plot and its characters are simply, but it is a very touching story that makes I recognize many things in life. Life is meaningful only for people who have hope and love. The hope helps us live better and heals our body and spirit. Hope is the foundation of our personal futures; each of us would probably suicide without hope. It is the virtue that helps us overcome obstacles. Without hope, we seem to give up easily like Johnsy in the story. Without hope, there is nothing. Another important thing in life is love. O. Henry, through the story, advices us should love ourselves and other people. The love between three persons, Johnsy, Sue and old Behrman makes a moving story. Johnsy had sometimes forgotten loving herself and cause the worry for Sue, but the...
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...Methods Harvesting. Harvest 2-3 young green compound leaves that show no signs of yellowing. Place collected leaves in a tray and transport them in a drying shade. Sorting and Cleaning. Immediately after harvest, clean and sort out collected the leaves from unnecessary materials such as dust and other foreign particles. Air-Drying. Lay out the leaves on a clean sheet of paper for 2-3 days. Manila paper, bond papers, and other similar materials can be used as the drying mat of the foliage. Do not sun dry for it would destroy Vitamins and minerals. Expect for the weight of leaves to decrease after drying. After the drying time, shake off the leaflets from the leaf petioles. The leaves will naturally fall-off or detach from the petiole. Shaking in screen or basket. Shake the dried leaves by using a 0.2-0.3cm fine mesh to remove leaf petiole that was shed out during the drying period. This process will eliminate other...
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...Effect of Leaf Stomata Density on Variation of Different Environmental Conditions Author: Patrick Sperandeo Institution: The Department of Biology, James Madison University ABSTRACT Plant structures that are usually found under trees leaves that control water loss are called stomata. Plants control water loss through the opening and closing of the stomata or by varying density. The purpose of this experiment was to see how sunlight exposure affected stomatal density. Since high light density associates with high stomata density, it was predicted that there was more stoma on higher leaves than lower leaves. However, there may be more stoma on lower leaves due to water stress; higher leaves would create shade for lower leaves. Therefore, the effect of differing leaf heights on stomata density was tested. In order to carry out the experiment, samples of 12 leaves were attained from each sample, “sun” and “shade”. Clear nail polish was applied to the samples making an inscription of the stomata. Clear tape removed the nail polish; the tape with the imprint was put on the slide. Under the 400x power, stomata were counted using the slide and the density was determined using a micrometer slide. Afterward a two sample t-test showed significant results at alpha value= 0.05. This supported the alternative hypothesis that varying leaf heights have an impact on stomata density. The prediction that higher levels of leaves topped lower ones when determining stomata was not supported. The...
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