October 2008 edited october 2011 in ap tests preparation. This practice exam is provided by the college board for ap exam preparation. The solute potentialof this sucrose solution can be calculated using the following formula. Calculation of water potential from experimental data 1. Well, weve seen the equation before where we introduced ourselves to the idea of water potential, that water potential, using the greek letter psi, is going to be equal to the solute potential plus the pressure potential. Since 1989, there have been 12 laboratorieslovingly nicknamed the dirty dozenthat are suggested curricula for ap biology classes. If the concentration of nacl inside the plant cell is 0. In activity a measuring blood pressure, students use a sphygmomanometer and stethoscope to measure blood pressure. Includes access to exclusive flinnprep digital content to combine the benefits of classroom, laboratory and digital learning. In trying to find a cells water potential in different molar concentrations and how the concentrations affect a real cell system, we conducted two labs. You will also learn how to calculate water potential. The addition of solute to the water lowers the solute potential and therefore decreases the water potential. In order to do work, an object must be able to apply enough force to another object to cause displacement. Does anyone have the answers for lab one of the ap bio lab manual.
They are in a condensed format which has six slides to a page. How can you measure the plant pieces to determine the rate of osmosis. The glucose left the bag and entered the beaker, when the beaker and bags were tested before the 30 minutes he test was positive for the bag and negitive for the beaker. The real cell system in the second lab was a potato. Diffusion and osmosis materials kits for ap example labs. For the love of physics walter lewin may 16, 2011 duration. The largest water potential any volume of water can have, if only standard atmospheric pressure is being. In activity b testing physical fitness, students count pulse rates under different conditions to determine their level of. Just please dont ask me for help on any biology concepts i took ap physics 1 as my science ap class this year and that test is history, and besides taking an introductory biology course during my freshman of year of high school and middle school as well which by the way, was ages ago, as i am a junior now i havent had much exposure to. Assign one student group to complete 2c while other groups are performing 2b. He explains how water can moved through osmosis and break down the two major parts of water potential solute potential and pressure potential. Founded in 1900, the college board is composed of more than 5,700 schools, colleges, universities and other educational organizations.
Osmosis and water potential shannan muskopf august 4, 2016 this investigation models osmosis using dialysis tubes that contain different concentrations of sucrose. These do not replace reading the textbook, so dont become overly dependent on them. Gently arrange your plants leaves on the grid of your lab write up p3. Water potential lab ap biology lab 1c water potential in this part of the exercise you will use potato cores placed in different molar concentrations of sucrose in order to determine the water potential of potato cells. The college board is a notforprofit membership association whose mission is to connect students to college success and opportunity. For complete listings of carolinatm ap science materials, including the advanced placement biology laboratory manual for teachers rn746681 and the advanced placement biology laboratory manual for. Osmosis and diffusion are two of the most important processes in the study of how organisms maintain homeostasis, particularly with regard to their electrolyte and water balances. The crash course is based on the latest changes to the ap biology course curriculum and exam. The college board has published a new lab manual, ap biology investigative labs.
Ecology and biosphere analyzing biome formation and characteristics. It is important for understanding water movement within the environment. Understanding essential properties of water ap biology. Mar 06, 2017 for the love of physics walter lewin may 16, 2011 duration. Ap biology lab manual for teachers revised edition by college board author isbn. Authors and contributors of the 1990 ap biology lab manual and subsequent editions. What causes plants to wilt if they are not watered. Organisms must exchange matter with the environment to grow, reproduce, and maintain organization.
Biologists use this term to describe the tendency of water to leave one place in favor of another. Students complete 2a and perform the first part of 2c. Distilled water in an open beaker has a water potential of 0zero. Our easytoread format gives students a crash course in biology. Ap biology investigative labs ap central the college board. Water potential is a numerical representation of how water moves from one area to another due to osmosis, gravity, or capillary action in biology. Ap biology laboratory 1 diffusion and osmosis overview in this lab you will. Ap biology some basic principles water always moves from high water potential to low water potential. Because of the shift from water to land, the plants. Note that the baseline determined should be approximately the same for all groups.
Ap bio water potential and diffusion lab by nikita. Supplemental ap biology resources water potential 9. About this book reas ap biology crash course is the first book of its kind for the lastminute studier or any ap student who wants a quick refresher on the course. Water potential flinn scientific,1771 your safer source for science supplies catalog no.
An increase in positive pressure raises the pressure potential and the water potential. Water potential is a measure of how likely water is to move from one location say outside the cell to another inside the cell. View bozeman ap supplemental 01 water potential from geography 12552 at lutheran high school south, newport. Make sure you label the oxygen, hydrogen atoms, as. Because of their varying natural sugar concentrations, the water potential will be very different. Diffusion and osmosis overview in this lab you will. Sucrose solutions can be made using table sugar, and instructions are included in the teachers guide to the lab. Water potential new jersey institute of technology. Collegeboard sends out surveys about ap testing from home, 45 minutes for only mc or frq 2.
Cell membranes are selectively permeable due to their structures. The largest water potential any volume of water can have, if only standard atmospheric. What kind of interactions can organisms have between each other and their environment. Water potential is a measure of the tendency of water to move from high free energy to lower free energy. The kits have enough materials for a class of 32 students working in. Exams may not be posted on school or personal websites. First, however, we will explore what is meant by the term water potential. Because of the shift from water to land, the plants had to overcome many challenges to survive. They span the globe in their topics and their techniques.
Understanding essential properties of water water often travels between cells and the environment via osmosis, where it diffuses from areas with low solute concentration where more water is present to areas with higher solute concentration where there. Factors that affect water potential pearson the biology place. Each blended learning lab solution includes prelab videos about concepts, techniques and procedures. Includes access to exclusive flinn prep digital content to combine the benefits of classroom, laboratory and digital learning. Fruit fly behavior prelab guided investigation independent inquiry c l i c k o n t h e t o p i c t o g o t o t h a t s e c t i o n pacingteachers notes slide 3 26. Population ecology analyzing density, dispersion, demographics, growth, and. Oct 18, 2007 the glucose left the bag and entered the beaker, when the beaker and bags were tested before the 30 minutes he test was positive for the bag and negitive for the beaker. The water potential of pure water in an open container is zero because there is no solute and the pressure in the container is. In this video paul andersen defines water potential and explains how it can be calculated in a simple system. Teachers can modify these labs to make them inquiry based in support of the revised ap biology course. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Sucrose solutions can be made using table sugar, and instructions are included in.
These materials kits include a selection of difficulttoacquire components to help your class successfully perform the college boarddeveloped ap investigative lab 4. Understanding essential properties of water water often travels between cells and the environment via osmosis, where it diffuses from areas with low solute concentration where more water is present to areas with higher solute concentration where there is relatively less water. This investigation models osmosis using dialysis tubes that contain different concentrations of sucrose. This lab strongly relates to the major theme of ap biology of evolution. The water potential of pure water in an open beaker is zero. Water potential psi as being made up of solute potential and pressure potential. In the water potential inquiry lab solution for ap biology, students study the effect of salt on plant cells in order to form and test a hypothesis in an experiment. This barcode number lets you verify that youre getting exactly the right version or edition of a book. In non walled cells, such as animal cells, the movement of water into and out of a cell is. Growth and dynamic homeostasis are maintained by the constant movement of molecules across membranes.
Ap biology lab manual for teachers supplement ideas for introducing inquiry interesting modifications to this lab can open it up to inquiry. Water always moves from an area of higher water potential to an area of lower water potential. Because you will be working with potato cells in the laboratory, you need to understand the concept of water potential. The second part of the investigation determine the water. Try using different types of potatoes russet, yukon, sweet or fruits apple, pear in part 1c. Calculate the water potential for each side of the membrane. He then explains the concepts behind the osmosis lab and how potatoes are affected by increasing sucrose molarity. Each blended learning lab solution includes prelab videos about concepts, techniques.
Design an experiment to determine the water potential of various plant tissues. In order for water to displace another object, water must be moving. What is the water potential in various plant cells. An inquirybased approach student manual 2012, which is also available in this store. This ap lab attempts to demonstrate the process of osmosis using. The new teacher manual is available as a free pdf on our website. Biology practice exam from the 20 administration this is a modified version of the 20 ap biology exam. In this lab, you will observe the process of osmosis and diffusion. Describe which way water will move and explain your answer. When plants shifted from living in an aquatic environment to living on a terrestrial environment it was a large evolutionary shift. If you are not familiar with these concepts, make sure that you have looked them up in your textbook.
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