Duckweed Growth

Then we inverted the tubes so an air bubble would form in the little tube that is now upside-down. Now that we know what to do, we marked the little tube 2/3 full. One tube was filled to that line with glucose solution, another with fructose solution, sucrose solution and the last one with water. Next, the little tubes were topped off with a yeast solution. Then we slide a big tube over the little one and completed the inversion, this is done for every little test tube. After they are all inverted our group measured the bubble present at the top of the little tube. Then we put all of the inverted test tubes into a hot water bath for 20 minutes. After 20 minutes we took the tubes out and measure the air bubbles in the tubes. Next, we recorded the data calculated the net change from the beginning of the experiment to after the hot

Today with my group lab we had to discuss on how to design an experiment that investigated the two herbicides DCMU and DCPIP. We used Elodea leaf and Elodea is basically a genus of aquatic plants often called the waterweeds and can be found anywhere in a pond or under water. So we started by creating a solution of phenol red, by adding 5 drops of concentrated phenol red to 40mL of water, then one of our group member used a straw to gently blow air into the solution until it reaches a neutral pH. We then transferred the solution into two test tubes evenly and labeled each tube dark and light, meaning the dark one will stay in the dark and the light one will stay under light bulbs. We predicted that dark one will stay the same and the light

To examine the the likelihood of survival of a water hyacinth in an environment that has high amounts of zinc, copper, phosphorus.

This experiment is being done to show the effect oh pH levels on daphnia by changing pH levels and measuring the hear rate.

We hypothesized that at Miracle-Gro concentration 1, this solution will be the most effective towards the rate of growth because at pure solution, the concentration is so high that the effect will occur sooner than those of lower concentrations, and speed up the life span to expiry of all the plants in the single solution concentration. Because we accept as true, that pure concentration will have the highest rate of growth, we can eliminate this concentration from our second question. We have come up with the presumption that at the concentration of 0.1 solution will allow the plants to be the most successful for the longest period because concentrations less than 0.1 would not appear to have any effect. There would be limiting nutrients within the solution and therefore would have a yield due to the lack of Miracle-Gro

AP Environmental Science-Acid Rain Labs:  Students were tasked with growing plants then using various concentrations of acidic water to gather qualitative data on plant growth and development in the presence of various acidic water mixtures over the course of two weeks. They then compared the Range of Tolerance of the plants to the local pH of rainwater to determine the expected impact on plants on the local level, as well as in other parts of the world.

According to a study, an experiment was done over the course of six years on the growth, needle, carbon, and nitrogen, chlorophyll, and

Based on our collaborative data from BI107 lab sections (2016), compared to the starting population, Blepharisma americana, Paramecium caudatum, Euplotes, and Vorticella’s average population size increased in pH conditions 7.0, 5.5, 4.5 and 3.5 (Figure 1). The reason for the ciliates to have a much higher average population size compared to the starting population is because they had the opportunity to reproduce for a week. All four ciliates had the lowest average populations at the pH condition 3.5 and the average population sizes of Euplotes and P. caudatum decreased as the pH levels decreased, implying that an acidic environment is not beneficial for their survival (Figure 1). This supports our hypothesis that a decrease in pH conditions leads to the decrease in average population size. Our results agree with Tremaine and Mills’s (1991) data, which suggests acidification decreased

Through this lab, we were trying to solve the problem of how different pH levels affect the population growth of yeast, which was based on the mm of carbon dioxide produced. Through this, our independent variable was the pH level of solution added to the test tube of yeast and sugar. Our dependent variable was the mm of CO2 produced, indicating population growth. For this lab, the proper control was a test tube with the yeast and sugar but no pH solution added. This was useful to compare our data to because it wasn’t being changed by the pH. Therefore, we were truly able to see if adding a base, acid, or neutral solution has an affect on the population growth of yeast. Based on the background knowledge that yeasts thrive in acid and die in bases, I was able to make my hypothesis. If we add a neutral solution, weak acid, weak base, and nothing to a sugar and yeast solution, then the test tube with the weak acid will exhibit the highest population growth. This will be due to the fact that yeast usually thrives in acidic environments and fades away in basic environments.

Finally from five to ten percent NaCl there is an increase of 0.00067, from these results we can see there is a small increase in averages as the concentration increases. However when analysing the sample size results there was the highest initial mass volume for the egg at 0.002267, 0.002167

The plants will go through one complete growth cycle in this experiment to determine whether or not the plant’s location in relation to the light will affect its height and width. The placement of the plants in the racks will be randomized using a random number generator. The pots will need to be placed equidistant from each other and fill up the entire rack so they are not equidistant from the LED lights.

Species will thrive in an environment with abundant food supplies and ideal conditions. The experiment will prove the effects factors such as nutrient availability and density affects the exponential growth of Duckweed. Factors contributing to a thriving community include abundant food, clean environments, and space among other resources. Duckweed can live in extreme environments except freezing poles and deserts (Naturia.per.sg). Under adequate ph., temperature, and availability of nutrients this aquatic plant will double its biomass in 16 hours to 2 days through asexual reproduction. If the plant is in a limited space the population will reach a maximum carrying capacity as its roots and leaves occupy the container. As overcrowding begins

Duckweed (lemnaceae) is a plant the reproduces by duplicating itself. It’s remarkable because it can survive in extreme environments with temperate climates with the exception of frozen poles and dry deserts, explains naturina.per.sg. It is a prime example of exponential growth because as naturina.per.sg reports it can double in as a few as 2 days. This is possible because under ideal conditions it has all the nutrients to spark growth. NPK Nitrogen, Phosphorus, and Potassium are nutrients essential to the growth of plants.

What do you observe about the effect of salt concentration on the rate of growth of V. natriegens?

This determines the acidity or alkalinity of the water in aquatic habitats or the soil in terrestrial habitats. The pH tends to be neutral at a value of 7 and increases if alkaline contents are abundant. Organisms are affected by the pH of their environment. Fresh water mollusks tend to be deficient on waters with a pH less than 6.