Essay on Paramecium movement assignment BES108

Their transparent bodies help the experimenters to easily see their pulse. Another reason for choosing this specific organism is their body structure—large surface area to size ratio. This feature allows the substances, such as the household drugs, to easily enter their body which then can affect their health.(1) The household drugs used in this experiment were decaffeinated coffee, tea, instant

The dialysis bag experiment resulted with beaker one having relatively similar numbers, showing as an isotonic medium. Beaker two’s solution gradually increased within an hour which caused the product to

I would describe the pillbugs’ response to moisture as taxis instead of kinetic. When an organism has a taxis response it either moves towards or away from a stimulus.

effected the heartbeat rate of a Daphnia. The results of the experiment were that the

In this experiment, contractions of the earthworm gut are measured in an organ bath with a force transducer. The effect of neurotransmitters and ionic concentrations on contraction strength and rate will be investigated.

Wet and Dry Environments To find whether Pill bugs gravitate toward a wet or a dry experiment, two coffee filters were cut to the size of the petri dish and placed inside, however one was dampened before being placed on the bottom. Dirt was then added on top to promote a more realistic environment and five Pill bugs were placed in each side before starting to prevent bias on an environment. A log was taken every thirty (30) seconds for ten (10) minutes on how many bugs were in each chamber and a graph was then made to show the changes of the bugs' positions over time. Again, if a Pill bug was in the transgression tunnel he was determined to be in a dish by the direction he was moving or the way it's head was facing.

Osmosis is a natural occurrence constantly happening within the cells of all living things. For osmosis to occur, water molecules must move across a semipermeable membrane from an area of low concentration to an are of high concentration. In order to understand osmosis, people must understand the different types of concentrations that can be present within solution. One of them is an Isotonic solution where the concentration of dissolved particles is equal to that of a cell’s. Another is a hypertonic solution where there is a higher concentration of dissolved particles then inside the cell. And lastly there is a hypotonic solution where there are less dissolved particles than inside the cell. As dissolved particles move to a region of lower concentration, water moves the opposite direction as a result of there being less water in the highly concentrated region. In this experiment, gummy bears were placed in salt water, sugar water, and tap water to find the measure of osmosis between the solution and gummy bear.

1. Explain the effect that increasing the Na+ Cl- concentration had on osmotic pressure and why it has this effect. How well did the results compare with your prediction?

Two circles were drawn directly across from each other on plain white paper. One was drawn with a black Sharpie marker, and the other was drawn with a black ballpoint pen. Three separate termites were dropped directly in the middle of the two circles, and their reactions were recorded for sixty seconds. This was repeated once for each termite.

1. What two parameters are responsible for creating the movement (filtration and reabsorption) of fluid across the capillary wall?

In this experiment, we will investigate the effect of solute concentration on osmosis. A semi‐permeable membrane (dialysis tubing) and sucrose will create an osmotic environment similar to that of a cell. Using different concentrations of sucrose (which is unable to cross the membrane) will allow us to examine the net movement of water across the membrane.

Purpose: The purpose of this lab is to observe the behavior of the Armadillium vulgare (roly- poly

The methodology of the study conducted by the researcher and author of this paper was a simple observation, which did not require any difficult-to-obtain equipment. Therefore, the only obstacle in the study would be recreating the environment.

Review Sheet Results 1. Explain the effect that increasing the Na+ Cl- concentration had on osmotic pressure and why it has this effect. How well did the results compare with your prediction? Your answer: The increase of the Na+Cl- concentration increased osmotic pressure the Na+ Cl- molecules diffused through the 50 mwco membranes and didn't go through the 20 mwco membranes. the more Na+Cl- we added to the 20 mwco membrane, the more the osmotic pressure went up. When I looked at my results I noticed when Na+Cl- was added to the 50 mwco membrane, there was no increase in osmotic pressure. This is becasue the Sodium chloride couldn't diffuse through the 50 mwco membranes. The higher concentration of molecues on one side of the mwco membrane forces the water movement to move to the side of greater solute concentration. 2. Describe one way in which osmosis is similar to simple diffusion and one way in which it is different. Your answer: Osmosis is similar to simple diffusion because both of these precesses have the passive transport characteristic. This is where particles in a solution move from an area of high solute concentration to an are of low solute concentration. Also neither of these processes need energy from an outside source to function. Osmosis is different than simple diffusion because in osmosis, if we have a selectively permeable membrane, this membrane is

The purpose of the paramecium experiment was to observe competition or allelopathy between two different species of paramecium in the laboratory. Allelopathy is a way organisms inhibit or affect other organisms when developing in nature. This insures the survival of one organism against another organism. For instance in plants, some can release a chemical that enters the environment and inhibits the growth and development of surrounding plants. Another example in nature is plants developing defenses to prevent herbivores from eating them. This kind of competition happens in nature when the need for resources is limited and survival is necessary. Competition is displayed throughout nature all the time. A man named Georgy Gause previously conducted this experiment between P. aurelia and P. caudatum. He determined that different factors influence how the two species compete and coexist. Ever since then not many scientist have attempted to experiment on paramecium. Only until recently have more experiments been attempted. The issue with the experiment was that it was conducted in 1935 and nowadays there are more advance ways to conduct and interpret the experiment and results.