<![CDATA[Transpiration Virtual Lab with 9 Plants (English Ivy, Weeping Fig, Dieffenbachia ,Devil's Ivy ,Arrowhead, Coleus, Geranium, Rubber Plant, Zebra Plant) under 4 conditions ( none, with heater, with fan, with lamp )]]> false false false true false ]]> ./assets/Screenshot 2022-06-25 at 1.57.45 PM (2).png ;;; DESCRIPTION_EDITOR To-Do true false _default_ To-Do false

To-do List (24/5/21)

QoL fixes

- Add visible light (glow) to the lamp

- Remove existing plant from potometer image

]]> 20 1 true VARIABLE_EDITOR EditableVariable true false VARIABLE_EDITOR Var Table true false VARIABLE_EDITOR transpiration_rates false false CODE_EDITOR Init Page true false LIBRARY_EDITOR EditableFunction true false LIBRARY_EDITOR shuffle true false 0; i--) { var j = Math.floor(Math.random() * (i + 1)); var temp = array[i]; array[i] = array[j]; array[j] = temp; } } ]]> LIBRARY_EDITOR fullscreen true false LIBRARY_EDITOR changePlant true false 0 && plant LIBRARY_EDITOR changeAppliance true false =0 && appliance LIBRARY_EDITOR calcTranspiration true false =numPlants || appliance>=numAppliances) return 0; var results = [[0, 0, 0, 0], [1.8, 3.2, 5.1, 2.1], // english ivy [3.3, 4.9, 6.1, 2.5], // weeping fig [4.1, 6.0, 7.7, 3.9], // dieffenbachia [2.9, 4.1, 4.6, 3.0], // devils ivy [3.6, 6.6, 7.5, 4.0], // arrowhead [0.9, 3.9, 6.0, 3.0], // coleus [1.2, 5.8, 4.7, 2.4], // geranium [4.9, 6.8, 8.4, 4.3], // rubber plant [4.2, 6.1, 7.6, 3.2]]; // zebra plant _view.meter.setValue(results[plant][appliance]); _view.reading.setText(results[plant][appliance]+" mL"); //document.getElementById("reading.text").getElementsByTagName("tspan")[0].innerHTML = results[plant][appliance]+" mL"; document.getElementById("plant"+plant+"_appliance"+appliance).innerHTML = results[plant][appliance].toFixed(1); return(results[plant][appliance]); } ]]> LIBRARY_EDITOR createTable false false '+ ''+ ''+ 'Plant/Transpiration Rate (mL)'+ 'no appliance'+ 'with fan>'+ 'with heater'+ 'with lamp'+ ''+ ''+ ''+ 'English Ivy'+ ''+ ''+ ''+ ''+ ''+ ''+ 'Weeping Fig'+ ''+ ''+ ''+ ''+ ''+ ''+ 'Dieffenbachia'+ ''+ ''+ ''+ ''+ ''+ ''+ 'Devils Ivy'+ ''+ ''+ ''+ ''+ ''+ ''; } ]]> HTML_VIEW_EDITOR HtmlView Page true false 0 0 0 800 600 true true Elements.Panel Elements.CheckBox Elements.CheckBox Elements.ComboBox 0)? opts[0]:""; // selected option console.log("you selected "+option); if(option=="English Ivy") { changePlant(1); } else if(option=="Weeping Fig") { changePlant(2); } else if(option=="Dieffenbachia") { changePlant(3); } else if(option=="Devil's Ivy") { changePlant(4); } else if(option=="Arrowhead") { changePlant(5); } else if(option=="Coleus") { changePlant(6); } else if(option=="Geranium") { changePlant(7); } else if(option=="Rubber Plant") { changePlant(8); } else if(option=="Zebra Plant") { changePlant(9); }]]> Elements.ComboBox 0)? opts[0]:""; // selected option if(option=="nothing") { changeAppliance(0); } else if(option=="heater") { changeAppliance(1); } else if(option=="fan") { changeAppliance(2); } else if(option=="lamp") { changeAppliance(3); } ]]> Elements.Button Elements.Button true Elements.Panel true Elements.PlottingPanel Elements.Image2D true Elements.Group2D true Elements.Group2D Elements.Image2D Elements.Text2D true Elements.Group2D Elements.Image2D Elements.Text2D false Elements.Group2D Elements.Image2D Elements.Text2D false Elements.Group2D Elements.Image2D Elements.Text2D false Elements.Group2D Elements.Image2D Elements.Text2D false Elements.Group2D Elements.Image2D Elements.Text2D false Elements.Group2D Elements.Image2D Elements.Text2D false Elements.Group2D Elements.Image2D Elements.Text2D false Elements.Group2D Elements.Image2D Elements.Text2D true Elements.Group2D Elements.Meter Elements.Text2D true Elements.Group2D false Elements.Group2D Elements.Image2D Elements.Text2D false Elements.Group2D Elements.Image2D Elements.Text2D false Elements.Group2D Elements.Image2D Elements.Text2D Elements.Panel
Plant Amt (mL)
no appliance with heater with fan with lamp English Ivy Weeping Fig Dieffenbachia Devil's Ivy Arrowhead Coleus Geranium Rubber Plant Zebra Plant ]]> true Elements.TabbedPanel Elements.Panel Factors Affecting Transpiration Rate in Plants

Purpose

In this investigation you will compare the rates of transpiration for several different species of plants under varying environmental conditions. You will investigate the effect of environmental factors (heat, light and wind) on the transpiration rate.

Objectives

  • Describe the process of transpiration in vascular plants
  • Investigate the effect of various environmental factors on the transpiration rate in plants

Procedure

Click on the "Experiment Info" tab to read more about this experiment.

Use the dropdown to select a plant and an appliance.

Click "Run" to simulate the experiment. The reading on the meter shows the amount of water transpired by the plant after 1 hour. Each reading will be automatically populated in the data table.
]]> Elements.Panel What factors affect the transpiration rate in plants? In vascular plants, water is absorbed through the roots and carried upward through the stem to the leaves. The force behind this upward movement is called capillary action, a force of attraction between molecules that causes liquids to move up narrow tubes, such as those inside a plant's stem.

Some of the water absorbed by a plant's roots is used for photosynthesis, but much is lost to the environment through a process called transpiration. During photosynthesis, tiny pores on the surface of the leaves, called stomata, open to permit the intake of carbon dioxide and the release of oxygen. Because the stomata must remain open for the exchange of gases, large amounts of water are lost to the environment through evaporation.

Water that evaporates from the leaves is continually replaced with water that is absorbed through the roots. Therefore a plant's rate of transpiration can be measured by observing the amount of water taken up through a plant's roots over a period of time. The transpiration rate can be approximated by measuring the amount of water taken up in a short time through the plant's stem.

In a laboratory, a plant's transpiration rate can be measured using a potometer. A potometer can be assembled from standard laboratory materials including: a ring stand, clamps, a 10mL pipette, a 100mL burette, a T-tube, glass tubing, and rubber tubing.

To measure transpiration rate, a plant sprig is mounted on the potometer and the burette and pipette are filled with water. Over time the plant will transpire and absorb water through its stem. The potometer is constructed in such a way that the plant's water source is the pipette, therefore the amount of water transpired over time can be determined by reading the water level in the pipette after time has passed. The water supply in the pipette can be replenished from the water supply in the burette by releasing the pinch clamp.
]]> Elements.Panel /* Hide answers by default */ .answer { display: none; }
  1. Describe the process of transpiration in vascular plants.
  2. Describe any experimental controls used in the Investigation.
  3. What environmental factors that you tested increased the rate of transpiration? Was the rate of transpiration increased for all plants tested?

    4. Suggested Answer: Several factors could contribute to the observed phenomenon where the transpiration rate appears to be lower for some plants under a lamp, despite the expectation that transpiration generally increases with more light. Here are some potential explanations:

    Intensity and Quality of Light:

    The type of light (e.g., intensity and spectrum) emitted by the lamp may not be suitable for promoting optimal photosynthesis and transpiration in certain plants. Plants have specific light requirements, and if the lamp does not provide the right intensity or spectrum, it could affect their physiological processes.

  4. Did any of the environmental factors (heat, light, or wind) increase the transpiration rate more than the others? Why?
  5. Which species of plants that you tested had the highest transpiration rates? Why do you think different species of plants transpire at different rates?
  6. Suppose you coated the leaves of a plant with petroleum jelly. How would the plant's rate of transpiration be affected?
  7. Of what value to a plant is the ability to lose water through transpiration?
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Idea based on a swf file

here

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