The Duckweed Experiment: Effects of Lowering Light Intensity on the Rate of Per Capita Growth of Lemna Minor

Have you ever really wondered how different variables can affect how plants go through photosynthesis? Well, in this experiment, the purpose was to see how various environmental conditions can affect the overall photosynthetic capacity of a specific plant. The factors, light, darkness, cold, and heat were applied to see how the different components would affect the photosynthesis on spinach plants. Each group was given a different factor to test. Out group was given the light factor. The hypothesis for this experiment is that when adding light as a factor, the light will affect the overall plant photosynthesis.

Introduction: Photosynthesis can be defined as a solar powered process that removes atmospheric carbon dioxide and transforms it into oxygen and carbohydrates (Harris-Haller 2014). Photosynthesis can be considered to be the most important biochemical process on Earth because it helps plants to grow its roots, leaves, and fruits, and plants serve as autotrophs which are crucial to the food chain on earth. Several factors determine the process of photosynthesis. Light is one these factors and is the main subject of this experiment. The intensity of light is a property of light that is important for photosynthesis to occur. Brighter light causes more light to touch the surface of the plant which increases the rate of photosynthesis (Speer 1997). This is why there is a tendency of higher rates of photosynthesis in climates with a lot of sunlight than areas that primarily do not get as much sunlight. Light wavelength is also a property of

The purpose of this lab is to observe the effect of white, green, and dark light on a photosynthetic plant using a volumeter and followed by the calculation of the net oxygen production using different wavelengths color of white and green light, and also the calculation of oxygen consumption under a dark environment, and finally the calculation of the gross oxygen production.

Firstly, for the setup of the experiment, two styrofoam cups were filled with two inches worth of standard, fertilized garden soil, next four seeds from from the garden seed, and the bird seed were placed an inch deep in separate cups. The seeds were blindly labeled, with one being labeled group A and one being labeled group B. This was so as to efficiently conduct a double blind experiment. The seeds were watered with approximately a teaspoon of water per day, and kept in a sunny windowsill. They were left in the windowsill for two weeks, and watered daily.

The purpose of this experiment was to investigate the effects of light intensity on the rate of photosynthesis in a Moneywort plant. By observing the plant in distilled water mixed with sodium bicarbonate, different light bulbs were targeted onto the plant. The measurement of the amount of bubbles present on the plant during the trial of the experiment enabled us to identify the comparisons between the activity of the light and the process of photosynthesis.

The results observed do not correspond with the outcome predicted by the hypothesis. Despite the nature of the subjects of the experiments, no substantial growth was observed. Only one seed of the 36 planted germinated, and it could only survive for a period of a week. The one seed that germinated reach a height of 1.2 cm. Table 1 presents the average growth observed in each quad. Each quad had a total of 12 seeds. No seeds were removed during the course of the experiment.

The rate of photosynthesis is affected by environmental factors like light intensity, light wavelength, and temperature. This experiment will test the

In my research paper, I will attempt to determine how the perception of light in phytochromes plays a role in the development of plants. Specifically, I will look at how phytochromes play a role in the growth and development of Arabidopsis thaliana. The paper will also look at how light perception plays a role in phototropism and the immune systems of a plant. Finally, my paper will explore how changing light conditions impact perception in phytochromes.

Follow the steps detailed in the first experiment to test the effects of an increase in light intensity on photosynthetic rates in corn (a C4 plant).

The original experiment was a failure, as the method of measuring duckweed by surface area was inefficient and inaccurate. The minimum amount of salt (2.5ml) added to the samples, turned out to be enough to kill all the duckweed, allowing no comparison to be made of the growth rate. In the second attempt I will count out a smaller, but exact, number of duckweed fronds which will make counting growth easier and more accurate. I will also use smaller amounts of salt (0.5-1.5 ml)

The authors are trying to determine how elevated Tsoil and elevated CO2 will affect the physiological responses of shade-tolerant species in light conditions. Also, how elevated CO2 and high light treatment affect physiological traits of shade-tolerant plants.

Population Growth: Density dependent factors Abstract Sets of experiments were used to assess the growth rate of the Lemna minor, a duckweed population. The growth of Lemna minor was observed and followed by counting and recording the number of thalli on a weekly basis. These experiments were constructed lab models which varied the size of the starting thalli population, and varied the nutrient concentration the thali were placed in. In the first experimental model two plastic cups were prepared with pond water, then two healthy lemna minor plants were placed in the first cup while fifteen healthy lemna minor plants were placed in the second cup. The second experimental model consisted of four nutrient concentrations, a control model of no nutrients, a low nutrient model, a medium nutrient model and a high nutrient model. At high density populations, we observed a nonlinear decreasing growth rate with increasing lemna minor density. At very low densities, as expected, we observed an inverse density dependence. Duckweed reproduces by budding, causing a larger density to reproduce a greater amount of biomass. This would indicate that Duckweed likes overcrowding, and this may be a possible clue to the limiting factor in the growth of Duckweed. Introduction Lemna minor, commonly known as duckweed, is efficient and fast growing, making it an ideal experimental organism. It is known as a small aquatic monocotyledon which can be found floating in ponds, lakes or streams (Harper,

With more studies being conducted on plants grown in various lights it could bring a rise in the production of vegetation indoors and out. The purpose of this study was to test whether or not plant grown in red, blue and normal light effect the growth of a bean plant. The question being, will red and blue light impact the growth rate of a bean plant? It was hypothesized that plants grown in blue light it would produce larger plants compared to the plants grown in the red and normal light. As (Smith et al. 1973) stated that blue light at a high energy can satisfy both requirements for growth but, red light at any level can only satisfy some requirements. If blue light can satisfy the requirements of growth production, than plants grown in blue light will produce taller plants compared to plants grown in red

Have you ever wondered what would happen if plants grew in acidic water? What about bottled mineral water? Water with fertilizer? Well, now you can know! In my experiment, I will be testing which type of water will help the plant grow better. In this case, I will be using duckweed to test the water. Duckweed is a very small, green plant that floats on the water’s surface. My hypothesis is that the duckweed will grow best in fresh water because duckweed is usually found growing abundantly in freshwater ponds or lakes.

Duckweed is a small aquatic plant that is able to grow rapidly, making it the ideal specimen for our experiment. It is hypothesized that altering the amount of light received by duckweed will alter its photosynthetic rate. It is predicted that a lower light intensity will lower the rate of growth in duckweed. Also is an important high-protein food source for waterfowl and also is eaten by humans in some parts of the world. As it contains more protein than soybeans, it is sometimes cited as a significant