1) Hypothesis and Null Hypothesis for experiments For the experiment involving the red blood cells, the proposed hypothesis is that if blood cells are placed into a hypotonic solution of distilled water, then the cells will undergo a process called hemolysis where they swell and burst. For this experiment, the null hypothesis is that if blood cells are placed into a hypotonic solution of distilled water, then the cell will not undergo hemolysis. For the experiment involving the elodea plant, the hypothesis is that if the leaf of an Elodea plant is placed into distilled water, then the cells will become turgid, but will not burst because of the cell wall. The null hypothesis for this experiment is that if the leaf of an elodea plant is placed …show more content…
This is because the cells were still completely intact. The blood that was mixed with the 0.9% salt concentration and 0.5ml of distilled water also appeared to be foggy at the end of the experiment since this would be an isotonic mixture. However, the blood that was mixed with 1.00ml of distilled water and no salt is the most transparent at the end of the experiment. When observing the leaf that was placed in the distilled water, the contents appear to be spread out completely against the cell wall and the wall appears to be swollen and hard. In this cell, the large central vacuole is observed to be completely filled with water. The cells of the leaf placed in the 0.9% saline solution appear to be less swollen but still full. When observing the leaf that was placed in the 5% saline solution, cells appear shriveled up on the inside of the cell wall. In these cells, the central vacuole cannot be seen at all. 3) …show more content…
Due to this, the blood that was placed in distilled water (the hypotonic solution) appears to be transparent. This is because there was very little if any hemoglobin left in the cells since they all had hemolysis. This is the same reason that the cells in the .9% saline solution and the 1.8% solution appeared to be foggy, this is because their cells did not show hemolysis and they therefore still have all the original hemoglobin present. Therefore, the hypothesis was correct, because the blood that was placed in distilled water ruptured and showed hemolysis. The plant cells that were placed in the hypotonic solution (the distilled water) appeared to be turgid because they looked hard and swollen. However, this cells did not burst like the animal cells because of the presence of the cell wall. The cells that were in the hypertonic solutions (5% saline) appeared to be shriveled up because the water was removed from them, which is the same thing that happens in animal cells. Therefore, the hypothesis is correct because the cells that were in distilled water became turgid but did not show
In this lab, we soaked a gummy bear in water for twenty four hours to see the effects osmosis would have on it. When we got our gummy bear we would take its measurements and soak it in water. After twenty four hours we would take it out and record the measurements again and find the percent change. The question that we addressed in this lab was, what would happen if you soaked a gummy bear in water for twenty four hours? I hypothesized that after this time the gummy bear would increase in size.
The egg contained less water before the vinegar solution causing the egg to take in water. When the egg was placed in the distilled water, it grew in mass. For each solution in the lab, state whether it was hypertonic, hypotonic or isotonic. Explain how you know.
Elodea” was put into a tank labelled “chemically treated Elodea”. Three drops of phenolphthalein were added to each beaker and then all of them were placed on a sheet of white paper. 0.02N NaOH was slowly added to the “tap water with Elodea” beaker with a dropper that delivers 0.025 mL per drop. Each drop was counted and the solution was stirred thoroughly before adding the next drop. This was continued till a faint pink color appeared in the solution.
When using a hypertonic and hypotonic solutions they can be shown in many different ways one way we showed this is putting an egg in corn syrup. The purpose of this lab is that students can observe and predict what is happening to an egg when you put it in hypertonic and hypotonic environments. The environments we put the egg in are vinegar, corn syrup, and water with food coloring. Using these materials we learned about osmosis, hypertonic environments, hypotonic environments, and passive transport. The purpose of this lab was to learn and get a better understanding of what is happening in the movement of molecules.
The Dionaea muscipula (J.Ellis,1768), is a species occupying habitats in the southeastern United States of America (North Carolina, South Carolina). Unlike other plants, the flytrap requires a specific climate to sustain off of. However, the venus flytrap has adapted to its ecological situation through centuries of evolution thus setting apart the flytrap from other basic plant organisms. The capture and digestion systems which are equipped carnivorous plants represent a remarkable and singular aptitude in the plant world.
They really saw how the cell was semi permeable because it allowed the water to leave and enter the cell during different situations. The question that had to be answered on Day 1 was what happened to the egg cell after it was put in vinegar. The hypothesis was proven correct because the egg cell shell was eaten away at by the acidic vinegar since the circumference grew by 13mm. The shell was really soft. If it was in there a little longer that the shell would eventually disappear.
Plant cells have a cell wall, vacuole. Under the microscope the most dominant characteristic you can see to identify the cell is the membrane, nucleus and structure of the cell, structure meaning the shape of the cell and the proximity between the cells. By observing the sample pictures of plant and animal cells before the investigation, we noticed that plant cells structure is more angular and has a cell wall which appears denser. Animal cells structure appears more oblong and have a softer looking
The purpose of this lab was to test the effect of pollution on algae growth. Through a series of experiments that lasted a month, four of the six hypotheses were proven to be correct or partially correct. The first hypothesis stated that if 0.5 mL of salt was added to algae, then the algae would grow slower than the positive control. This was proven correct, as shown by the difference of the data from the positive control and the container with 0.5 mL of salt in it.
However, after investigation through gel electrophoresis, the three kinds of plants were not identical. This relates to the
With the use of colorimeter, it will show how much light can be transmitted through the solutions. When the cells in the solution are centrifuged, they go to the bottom of the tube to form pallets. The liquid above the pallet are clear then they are able to quickly transmit light. However if the cells has erupted, the hemoglobin is released will be left above the pallet and observed cloudy. This will cause the solution to have less light transmitted during the use of
In the first experiment with the tap water, the gummy bear increases in both mass and volume. This means that the gummy bear was hypotonic to the tap water, since the water flowed from the cup into the the bear. In the second experiment with salt
The next test used the test tubes labelled “cold” and , one again using a piece of liver and five milliliters of hydrogen peroxide with both being placed in the ice bath, both held vertical with a test tube clamp. After five minutes were up using a timer, the two tests were conducted. The test involving the boiling water had five milliliters of hydrogen peroxide poured into it. Meanwhile, the five milliliters of hydrogen peroxide was poured into the test tube labelled “cold”. After both tests, explanations were made about the
Experiment 11.1: Examining a Blood Smear Introduction: In this section, we discussed the types of blood cells and their appearance when stained and observed under a microscope. You will now examine a blood smear and try to identify the cells. Summary: In recent years, scientists have invented technology to synthesize many parts of the human body including cochlear implants, contacts, and prosthetics.
Introduction: In this task I will be researching the effect that acid rain has on the rate of plant growth. Acid rain is any type of precipitation with a high pH, with high levels of nitric acids. The reason why I had chosen this topic was because acid rain seems to have a great effect on the effect of plant growth, and plants play a very important role in our ecosystem. Acid rain is a major problem in our environment when we are not able to neutralize the acidity.
The hypothesis we came up with for this project was that in the distilled water there wouldn't be no change in the potato, we wouldn’t see a gain or loss with the water sitting in the beaker. The beaker with the 30% Sucrose and Distilled water we predicted that there was going to be weight gain to the potato. And for the distilled water with the 30% sucrose and we predicted weight loss. But the results came out to be the first bag content being isotonic the second bag came out to be hypotonic and lastly the result came out to be