Virtual Lab Dependent And Independent Variables-Books Pdf

Virtual Lab Dependent and Independent Variables
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5 Read the instructions for setting up your chambers Here you can make some decisions about what level of. ECB infestation you will start with Change one variable at a time Record your measurements in the data. Level of ECB, Corn Variety Pot 1 Yield Pot 2 Yield Pot 3 Yield Average. infestation, 6 Describe the effects of the ECB infestations you used Were all corn varieties equally effective at. controlling the ECB How do you know, 7 Did the level of ECB infestation change your results. 8 What is the purpose of taking an average, Identify Controls and Variables. Read the description of each experiment Identify the parts of the experiment listed below. Experiment I A student wants to know if her hosta plants normally grown in shaded areas will be able to. grow under full sunlight She plants 10 hostas in a shaded area of her yard She plants 10 more in an area of. her yard that receives full sun exposure She waters them three times a week for 6 weeks After six weeks she. measures the heights of the hostas, A Hypothesis If the independent variable describe how it will be changed then the dependent variable describe the effect Be specific.
B Experimental Group, C Independent manipulated Variable. D Dependent responding Variable, E Constants, Experiment II A student wants to know what effect temperature will have on the germination rate of radish. seeds To test this she obtains 3 petri dishes and 60 radish seeds She places 20 seeds in the first petri dish and. stores it at room temperature She places another 20 seeds in the second dish and places it in the freezer She. places 20 seeds in the third petri dish and places the dish in an incubator Over the next two weeks she waters. the dishes daily and records the number of seeds germinated At the end of the experiment she calculates the. germination rate for the seeds at each temperature. A Hypothesis, B Experimental Group, C Control Group. D Independent manipulated Variable, E Dependent responding Variable. Experiment III In 1887 a strange nerve disease attacked the people in the Dutch East Indies The disease was. beriberi Symptoms of the disease included weakness and loss of appetite victims often died of heart failure. Scientists thought the disease might be caused by bacteria They injected chickens with bacteria from the blood. of patients with beriberi The injected chickens became sick However so did a group of chickens that were not. injected with bacteria One of the scientists Dr Eijkman noticed something Before the experiment all the. chickens had eaten whole grain rice but during the experiment the chickens were fed polished rice Dr. Eijkman researched this interesting case He found that polished rice lacked thiamine a vitamin necessary for. good health, A Hypothesis, B Experimental Group, C Control Group.
D Independent manipulated Variable, E Dependent responding Variable. Experiment IV A botanist thinks that mustard plants will grow faster in red light compared to sunlight The. following table shows his experimental design, Experimental Group Control Group. Type of Light Red Sunlight, Type of plant Mustard Garden Pea. Temperature 20 C 30 C, Amount of Water 5 ml day 10 ml day. The botanist measures the height of each plant daily and uses this information to calculate a growth rate after a. two week period He concludes that his hypothesis is incorrect because the plant in sunlight showed a faster. growth rate than the plant in red light, 1 How many manipulated variables were there in this experiment How many should it have.
2 Help the botanist fix his experiment by completing the table below. Experimental Group Control Group, Type of Light, Type of Plant. Temperature, Amount of Water, 3 What is the manipulated variable in the experiment now. 4 List the constants in the experiment, Experiment V Jordan is doing a science fair project on the effects of music on the growth of. tomatoes He has two tomato plants Plant A and Plant B which he grows in the same window and. they are given the same amount of water Plant A is exposed to classical music using headphones. attached to the soil Throughout the one month growth period Jordan counts the number of tomatoes. produced by each plant The results are in the data table below. Plant A Plant B, Week 1 2 5, Week 2 6 11, Week 3 12 19. Week 4 18 29, Week 5 26 40, Week 6 35 55, A Hypothesis.
B Experimental Group, C Control Group, D Independent manipulated Variable. E Dependent responding Variable, F What type of graph should be used to show the results of this experiment and explain why. G What should Jordan s conclusion be Write this in a complete sentence and be specific. H Jordan needs to repeat the experiment but his teacher says that he needs to improve his design In his. second experiment what are at least two things that he should do differently. Experiment VI Tina asks the question Does caffeine increase the heart rate of an earthworm. In Test 1 she measures the heart rate by looking at the earthworm under a microscopes the. earthworm has a heart rate of 50 bpm beats per minute In Test 2 she places a few drops of. caffeine on the earthworm s skin and measures the rate again In this test the heart rate is 68 bpm. A Hypothesis, B Control Group, C Independent manipulated Variable. D Dependent responding Variable, E What is an experimental constant. F Tina needs to improve her experimental design In her second experiment what are at least two things that. he should do differently, How Penicillin Was Discovered.
In 1928 Sir Alexander Fleming was studying Staphylococcus bacteria growing in culture dishes He noticed. that a mold called Penicillium was also growing in some of the dishes A clear area existed around the mold. because all the bacteria that had grown in this area had died In the culture dishes without the mold no clear. areas were present Fleming hypothesized that the mold must be producing a chemical that killed the bacteria. Explain how Fleming could test his hypothesis, How Penicillin was Discovered. Antibiotics are chemical compounds that selectively kill microorganisms many of which cause diseases. Although we may take antibiotics for granted today penicillin was discovered only about 85 years ago The. subsequent development of a wide array of other antibiotics for treating many common diseases has contributed. greatly to the substantial increase in life expectancy over the past 50 years. In 1928 Alexander Fleming a young microbiologist at the University of London was working with a common. bacterium Staphylococcus which is commonly found on the skin or in the nose of healthy individuals But. staph infections can turn deadly if the bacteria invade deeper into your body entering your bloodstream joints. bones lungs or heart For laboratory study bacteria are commonly grown on the surface of a nutrient. containing gel in small flat culture dishes, One day Fleming noticed that one of his cultures was contaminated by a bluish green mold similar to the mold. found on spoiled bread or fruit Such accidents are rather common and most laboratory workers would have. simply thrown the cultures away Fleming noticed however that the bacteria were growing everywhere on the. gel except near the contaminating mold Figure 1a He thought that the mold must be producing a substance. that either killed the bacteria or prevented their growth. To test his hypothesis Fleming used Staphylococcus bacteria as well as other strains of bacteria He set up. several bacterial cultures in the regular nutrient gel Group A He also set up the same bacterial cultures in the. nutrient gel that contained the Penicillium mold Group B All of the bacteria in Group A grew all over the. cultures in the nutrient gel All of the bacteria in Group B did not grow around the Penicillium mold. Because the mold was a member of the Penicillium family named for their pencil shaped branches under the. microscope Figure 1b Fleming called the active ingredient penicillin. a bacterial growth in nutrient gel, b Penicillium mold is growing in a culture dish the photo shows its effect on bacterial growth. c In this photomicrograph of Penicillium its rod and pencil shaped branches are visible The name comes. from the Latin penicillus meaning paintbrush, 1 What was Fleming s hypothesis. 2 What type of data was collected in experiment Qualitative or Quantitative Why. 3 Could it be both qualitative and quantitative How. 4 Does this indicate that Penicillin will inhibit growth or kill ALL bacteria Explain. 5 Why is it important for Fleming to report and share his results. Graphing Practice, Step 1 Choosing the correct type of graph.
When to Use a, Bar graphs are used to compare things between different. groups or to track changes over time However when trying to. measure change over time bar graphs are best when the. changes are larger, Line graph, Line graphs are used to track changes over short and long. periods of time When smaller changes exist line graphs are. better to use than bar graphs Line graphs can also be used to. compare changes over the same period of time for more than. Pie charts are best to use when you are trying to compare parts. of a whole They do not show changes over time, Step 2 Setting up your axes. Always put the independent variable along the X axis and the dependent on the Y axis. Make sure that your scale is consistent For example 1 block 5 days and can be determined very easily. Work with multiples of 1 2 5, Never put any breaks those squiggly things you do in math class in the axis. Step 3 Plot your data, Start out but just putting data points on your graph.
Connect the points with a line if you re, making a line graph. Draw your bars if you are making a bar, Step 4 Label your graph. Title This should be a statement, explaining what your graph is about. usually more than just a couple of words, not just X vs Y. X and Y Axes should also include labels, Make a key legend if there is more than.
one data set on a single graph, 1 What type of graph is this. 2 What happens to the number of predators, when the number of prey increase. 3 Why do you think this happens, 4 What happens to the number of predators. when the number of prey decrease, 5 Why do you think this happens. 1 What type of graph is this, 2 Which insect has the fewest wing.
vibrations per second, 3 A cicada vibrates its wings about 300 times. per second Which insect is a cicada s, vibration rate most similar to. 1 Would a line graph or a bar graph be better for showing the number of birds of each color in a population. 2 How could you plot more than one responding variable on a line graph. 3 Where do you place the manipulated variable on a graph. 4 Which type of graph would you use to show comparisons Explain. 5 Why is it important to have all parts of a graph clearly labeled. A wild life researcher was collecting data to determine what animal has the strongest bite Data table 1 shows. the data that the researcher collected in the field. Data Table 1 Bite Force Data, Bite Force, pounds per square inch. Snapping Turtle 1004, Hyena 1000, Domestic Dog 328. Wild Dog 317, Humans 127, Bite Force, Snapping TurtlesHyena Lion Domestic DogWild Dog Humans Shark.
1 Did the researcher choose the correct type of graph for this data Explain. 2 Identify the dependent and the independent variable in this study Are the dependent and the independent. variables set up on the correct axes, 3 Fill in the missing labels on the X and Y axes. 4 Bite Force is not a very good title for this graph What would be a better title for this graph. Virtual Lab Dependent and Independent Variables Name Biology Date Period Introduction In this lab you will use a simulation to further your understanding of independent and dependent variables You will be studying the level of European Corn Borer infestation in various environments

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