Objective The purpose of this lab was to demonstrate and view the osmotic process without using a microscope or chemical testing. In order to do so, background knowledge on the direction and flow of water is needed to identify the movement of osmosis. Hypothesis The hypotonic solution will cause the potato strip to become heavier relative to its previous mass, the hypertonic solution will cause a decrease in the potato strip’s mass, and the isotonic solution will result in no change in mass. Pre-Lab Questions Why is it so important not to eat or drink anything in the lab? It is important not to eat and/or drink anything in the lab because often times, many chemicals are clear, colourless and odourless. In addition to that, sometimes chemicals are able to diffuse into the air due to …show more content…
However, the isotonic beaker with no NaCl solution did not cause the plant to remain at the same weight, but instead allowed it to take in a bit more water than the hypotonic solution. 5. State your conclusions about the influence of solute concentration on the direction of osmosis. In conclusion, osmosis is highly sensitive to various solutions. Thus, any amount of solute within the water will affect the flow of osmosis and the mass of any plant. Although no physical changes happened, that could be seen, ten minutes after placing the potato strips in the saline solutions, it was evident that the more water the beaker had, the more the potato strip weighed. It was also found that the more concentrated the saline solution, the less the potato strip weighed. laboratory, while the potato strips were in their beakers, we had not noticed any changes. Source of
Additionally, it was difficult obtaining a piece of rhubarb that was thin and particularly red, therefore the effect could not be best observed in the cells. Part B: Design your own experiment Parts of this practical were taken and slightly altered from the following link http://www.markedbyteachers.com/gcse/science/investigate-the-effect-of-surface-area-on-osmosis-in-potato-tissue.html Aim: To observe the effect different surface area: volume ratios have on osmosis in potato tissue. Hypothesis: If the potato has a larger surface area: volume ratio, the quicker osmosis will take place and the larger the mass will be at the end of the experiment, therefore the difference in mass of the potatoes from the start of the experiment to the end of the experiment will be larger. Additionally, the potato pieces left in a saltwater solution will decrease in mass, whereas the pieces left in water will increase in mass.
In this experiment, the sodium bicarbonate increases the rate of photosynthesis. Which trial resulted in all the leaf disks floating the fastest? Explain why you think this happened? Lettuce.
Doriana Spurrell What different frequencies and types of light would prompt the Spinach leaves to go through the process of photosynthesis effectively? Purpose: The purpose of this experiment was to see which of the four lights that range across the light spectrum would properly and most efficiently help the spinach leaf perform photosynthesis. Background Information: Photosynthesis is the process in which plants use light energy to transform into chemical energy.
Haya Al-Khater Mr. Gurney Biology HL December 1, 2014 The Effect of Light intensity on rate of photosynthesis Research question- How does light intensity affect the rate of photosynthesis in Spinach leaves (Spinacia oleracea)? Hypothesis-
Exploration Title: Effect of Temperature on rate of Osmosis Submitted By: Abdulkarim Kamal Date Submitted: October 19th 2015 Subject: Biology HL Teacher: Mr. Nick Aim: This is an investigation to determine the relation between temperature of a solution (sucrose) and the rate of osmosis Scientific Context: Osmosis is defined a passive transport process in which a fluid diffuses across a semi-permeable membrane, from an area of high solute concentration to an area of low solute concentration and vice-versa. There are various factors that could potentially influence the rate of osmosis; these factors include volume, concentration, and temperature. If all external factors that may interfere with rate of osmosis are controlled, the results will show equal amounts of fluid on both sides of the barrier (membrane); this is known as an “isotonic” state.
Effect of carbon dioxide availability on photosynthetic rate of the leaves of Elodea Densa. Rosanth Anparasan1, Muhammad Ali Qazi1, Kyle Patel1, Sheldon Lui1, Hossein Bhorbani 1 1Dept. of Biological Sciences, University of Toronto Scarborough, Toronto, Canada UTSC BIOA01 Lab PRA20, BENCH5: PRA20 TA: Ashley Bramwell ________________________________________ Abstract: The process of photosynthesis is the most essential chemical processes that occurs on the planet.
Diagram * Note: Cups are not drawn to their authentic scale and are of equal size in the real experiment. This is just for representation. Works Cited "Osmosis - Osmosis In Living Organisms." - Cell, Water, Cells, and Solution.
This also shows how much water was transferred from the egg to the sugar solution. The higher the percentage of corn syrup was, the faster the rate of osmosis was. As a result, the egg placed in 75% corn syrup, 25% filtered water had the lightest weight (0.5 oz), while the egg placed in 25% corn syrup, 75% filtered water weighed 2 oz. Overall, the importance of this lab was to understand the process of osmosis and how it differs depending on the type of
In this lab we used two processes called Diffusion and Osmosis. Diffusion is the movement of molecules from areas of high concentration to areas of low concentration. Diffusion is a process that requires no energy and involves smaller non-polar molecules. In Figure 1 you can see the molecules spreading throughout the glass from the area of high concentration, so that the areas with low concentration are filled evenly as well. The other process was osmosis.
How Calcium Effects Bean Plants Photosynthetic Rate Tristen Webber Introduction In this study I measured the growth of a bean plant over 13 days and then measured the photosynthetic rate by measuring the amount of chlorophyll a in the leaves of the plants. Photosynthesis is the process of plants creating glucose from, water, carbon dioxide and sunlight. Photosynthesis depends on the absorption of light from pigments in the plants leaves. I tested how calcium would affect the photosynthetic rate of the bean plant.
Osmosis Lab Report Research Question: How does the change in the concentration of a sucrose solution affect the process of osmosis in a potato cell by measuring its mass? Background information: 1 Osmosis is the process by which a liquid passes through a semi-permeable membrane, moving from an area with a high concentration of water to a low concentration of water. There are various factors that affect osmosis such as: concentration, surface area and temperature. The concentration of solutions can affect the rate of osmosis, as there is more difference in the concentration of the solutions, which means osmosis, will take place quicker. Surface area could affect osmosis based on the ease by which molecules can get through the semi-permeable
An egg naturally has a lot of stuff inside, so the outside solution has to be very concentrated for this to happen. That’s the case when an egg is treated with corn syrup or buried in salt. By contrast, when an egg is treated with distilled water, or a dilute salt solution, the solute concentration is higher inside the egg than out, so the water moves into the egg, increasing its mass. It may be easier to think about osmosis in terms of water concentration rather than solute concentration. If the solute concentration is high, then the water concentration will be low by comparison.
Photosynthesis is the process the energy from sun lights to produce ATP which is used to make sugar such as glucose, sucrose, cellulose, and starch. Photosynthesis involves two different processes, which are light dependent reaction and light independent reaction. Light dependent reaction requires light energy to split water molecules (photolysis) into hydrogen ions (H^+), oxygen (O_2) and electrons to make ATP and the light dependent reaction allows plants to grow and make a waste product (oxygen), energy conversion reactions, convert solar energy to chemical energy. In the light independent reaction stage, H^+ and ATP are used to fix 〖CO〗_2 to make organic molecules. Sugar can be produced by the process of Calvin cycle in the chloroplasts
Background Information: In this experiment I will be investigating the impact of light intensity on the rate of water uptake, due to transpiration, by attaching a shoot from a leafy plant in the capillary tube of a potometer, and then measuring how long it takes for a bubble to move a set distance. The faster the bubble moves, the greater the rate of transpiration. I will be placing one plant in an environment where it is exposed to high-light intensities, and another plant in an environment where it is exposed to low-light intensities. Transpiration is the process of the transport of water and nutrients up the the plant from the roots to the leaves.
Biology Design Practical Joshua Edwards What are effects of the volume of a potato and the amount of weight it loses when placed in salt solution? Introduction This design practical uses a potato’s surface area to volume ratio to see what affects it has on osmosis in different concentrations. Osmosis is the movement of water molecules through a cell membrane into an area of a higher solute concentration. The movement goes the way of the solvent with more solute because the lower solute concentration is drifting through balancing the ratio of solute per solvent (En.wikipedia.org, 2018).