Transpiration Lab Design.
By: Darya Topildieva.
Background Knowledge: Transpiration is defined as the movement of gases through fine tubes due to different pressures or temperatures. A gas that is essential to plants is carbon dioxide which is used in photosynthesis and enters the plant through the stomata. The carbon dioxide flow through tiny spaces to the cells that conduct photosynthesis which are coated with a thin layer of water. The cell wall does not allow carbon dioxide to pass, however, once it has dissolved in water it is able to pass through the cell wall. The cells remove the carbon dioxide from the water and use the same water to carry out oxygen, the main waste product of photosynthesis. More than 90 percent of the plant’s uptake of water is evaporated through the stomata; this is why it is essential for plats to have a source of water.
Research Question: What is the rate of transpiration of a lilac plant in different light intensities?
Hypothesis: If the light intensity that is shone on the plant changes, becoming less/more intense, then the rate of transpiration will also become slower/faster accordingly.
Independent Variable: Light intensity changed with use of low, medium and high light intensities of a fluorescent lamp.
Dependent Variable: The distance moved by the air bubble caused by transpiration and the time taken for it to move that distance.
Controlled Variables:
• The temperature must be kept constant throughout the experiment, because if the temperature is increased or decreased, the rate of transpiration will change due to kinetic energy of molecules.
• Distance of the lamp to plant must be kept regular because the lamp may give off heat or cause a slightly different intensity to be obtained by the...
... middle of paper ...
...ble to move this distance(s)
11. Repeat this 5 times and calculate the average.
12. Change the light intensity of the lamp and repeat all following steps.
13. Make a clear table of the collected data.
Bibliography:
Foundation, Nuttfield. "Measuring Rate of Water Uptake by a Plant Shoot Using a Potometer." Nuffield Foundation |. Nuffield Foundation, n.d. Web. 20 Dec. 2013. .
Farlex. "Transpiration." The Free Dictionary. Farlex, n.d. Web. 20 Dec. 2013. .
"Potometer - Google Search." Potometer - Google Search. Google, n.d. Web. 20 Dec. 2013. .
Experiment #1: The purpose of this experiment is to investigate the effects of baking soda and light intensity on the rate of photosynthesis of green spinach leave through the observation of floating disk.
The Effect of Light Intensity on the Rate of Oxygen Production in a Plant While Photosynthesis is Taking Place
Elodea are adaptive, oxygenating aquatic plants. They utilize water and light (among others) to photosynthesize in water, and expel oxygen into their environment. However, there are ways the photosynthesis of Elodea can be affected; some ways include a fluctuation in light, temperature, and water level. This lab experiment ran on the theory that different water types could also be a factor to different photosynthetic levels. Elodea were soaked in distilled, tap, and untreated (pond) water and left for an hour under a light source. The carbon level was taken in the form of adding phenolphthalein and NaOH to the water samples after the experiment finished up. It was discovered through this lab that distilled water allowed Elodea to photosynthesize
Moreover, a future experiment is to determine the effect that the distance between the lamp and the solution has on the rate of photosynthesis. Several experiments with a similar setup to this experiment that vary the distances between the lamp and solution could be used to test this.
"Photosynthesis chlorophyll light intensity temperature carbon dioxide factors affecting rate." Photosynthesis chlorophyll light intensity temperature carbon dioxide factors affecting rate. N.p., n.d. Web. 19 May 2014. .
Two members of the group were instructed to visit the laboratory each day of the experiment to water and measure the plants (Handout 1). The measurements that were preformed were to be precise and accurate by the group by organizing a standardized way to measure the plants. The plants were measured from the level of the soil, which was flat throughout all the cups, to the tip of the apical meristems. The leaves were not considered. The watering of the plants took place nearly everyday, except for the times the lab was closed. Respective of cup label, the appropriate drop of solution was added to the plant, at the very tip of the apical meristems.
I predict that the higher the concentration of the reactants the higher the rate of the reaction.
...drought is a more serious case in which plants have to either acclimate or adapt to the environmental condition in which it is living in to combat the heat stress. Deep root systems and early stomatal closure are a couple strategies that plants use to increase water uptake and decrease transpirational water loss. During rainfall, plants have more water available to them because of the increase in soil water potential and stomatal conductance. Frequency in precipitation pulses allows the plant to photosynthesize and transpire in moderation. An aim for future research is to study plant physiology at the community and ecosystem levels to further understand the water and carbon budgets (Loik 2007). A plant behavior under extreme drought conditions or increased rainfall variability can help predict future changes in CO2 assimilation and help preserve plant ecosystems.
Photosynthesis is, “the process by which plants convert light energy from the Sun into chemical energy in the form of carbohydrates” thus producing, “food for all living organisms, directly or indirectly” (Zheng). Photosynthesis has been examined in thousands of different ways. Many of these experiments include studying the rate of photosynthesis and pigment accumulation by obtaining plants and then stressing their light and nutrient intake (Okunlola and Adekunle). Photosynthetic pigments reflect and absorb different wavelengths of visible light based off their polarity. In this experiment, we studied photosynthetic pigments, first, by determining polarity and then, by measuring the amount of light of a given wavelength that a pigment absorbs. We used two methods in this experiment, chromatography and spectrophotometry. Chromatography “is a method used to separate mixtures of substances into their components” (lab book) and spectrophotometry is the use of a spectrophotometer to measure transmittance of light through a liquid. We used our knowledge of polarity to predict that since the least polar pigments move the most, pigment 1 is chlorophyll b, pigment 2 is chlorophyll a, pigment 3 is an anthocyanin, pigment 4 is a xanthophyll, and since most polar pigments move the least, pigment 5 is
The “Fast Plant” experiment is an observation of a plants growth over the span of twenty-eight days. The objective is to observe how plants grow and use their resources throughout the span of their life. In our lab we observed the Brassica rapa, a herbaceous plant in the mustard family which has a short cycle which makes it a perfect plant to observe in this experiment. Like other plants the Brassica rapa must use the resources in the environment to create energy to complete itʻs life cycle and reproduce. By observing the plant it is easy to see in what organ or function the plant is using itʻs energy and resources and if overtime the resources switch to other part of the plants. By conducting this experiment we are able to observe where and how plants allocate their resources throughout their life by harvesting plants at different points in their life.
10% - 15%. I intend to place a predefined weight of potato cells (0.15g) in varying concentrations of sucrose solution (0%, 20%, 40%, 60%, 80%), to see the effects of osmosis in the cells of a potato in varying levels of sucrose solution. The potato cores will be prepared, weighed and then placed in the solution and left for a certain amount of time, they will then be removed, re-weighed and the difference in weights calc...
In a similar transpiration lab, performed by an AP student, the results showed that controlled was the fastest, wind the second, light and heat the third, and humidity the slowest. These results occurred because all four environments played a role in increasing evaporation which therefore increased the rate of evaporation. In the controlled environment, the room temperature helped increase the rate of evaporation (1.67mL/m²). In the wind environment, the blowing of air on the leaves increased the rate of evaporation (0.76 mL/m²). In the light and heat environment, the heat hitting the plant increased the rate of evaporation therefore increasing amount of water being transpired (0.93 mL/m²). In the humidity environment, the moist ...
Light is a very important factor in the rate of photosynthesis, in my project I am going to test that plants do need light in order to photosynthesise. It will be very interesting to see how light will influence the rate of photosynthesis in plants and what will happen if they do not get the required light in order to produce starch .
Hypothesis: The rate of photosynthesis in the water plant hydrilla will change as the rate of carbon dioxide changes.
Equipment Potato, Borer, Beakers, Measuring Cylinder, Stopclocks, Distilled Water, Electronic Balance, Salt solutions of various concentrations. Diagram [IMAGE] [IMAGE] [IMAGE] When we leave the potato in the solution for the allocated time, water