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- Experiments usually have several controlled variables. These are variables that must be kept constant in all parts of an experiment. For example, if an experiment is testing the effect of sunlight on the growth rate of 5 seeds, the only variable that should change should be the amount of sunlight. All other variables should remain the same to ensure that sunlight is the only aspect affecting the results. The other variables, such as soil type, amount of water, type/amount of fertilizer, are the controlled variables. Looking back at the simulation experiment on the meteorite, describe two variables that should have been controlled.A biology student is investigating the claim that the temperature can be predicted by counting cricket chirps. He has collected data and comes up with the linear model T=39.2+0.233r, where T is the temperature in degrees Fahrenheit and r is the number of chirps per minute. Interpret the slope of the equation. The model predicts a decrease of 0.233 degrees for each increase of 1 chirp per minute. The model predicts a decrease of 39.2 degrees for each increase of 1 chirp per minute. The model predicts an increase of 39.2 degrees for each increase of 1 chirp per minute. The model predicts an increase of 0.233 degrees for each increase of 1 chirp per minute.Make a graph in Excel using the data ( the image ) This data represents results from a fictional study comparing bee body weight to insecticide exposure. a. Tittleb. The graph can be any style or format but must display a relationship between the independent (x axis) and dependent (y axis) variables.c. Both axis of the graph must be correctly labeled, including correct units, andrepresent the independent and dependent variables.d. The graph must contain a trendline with a trendline equation and R2 value
- Beige and black rabbits were introduced into two meadows. One meadow predominantly consists of volcanic soil and the other predominantly consists of clay soil. Each rabbit was marked with a dot of blue paint and the pad of his foot. The number of rabbits released and recaptured one month later are shown in the table below. Assume the number of rabbits recaptured is a direct reflection of the number of rabbits surviving. Using the data below, what conclusions can you make regarding the color of rabbits and their survival in different soil types? VOLCANIC SOIL # released #recaptures % precentage beige rabbits 137 18 13.1% black rabbits 447 123 27.5% CLAY SOIL # released # recaptures % precentage beige rabbits 393 54 13.1% black rabbits 406 19 4.7%Describe an experiment to test whether soil pH affects the growth rate of sunflowers. Include all of the following: hypothesis, predictions, controlled variables, independent variable, dependent variable.For this experiment, you will be able to manipulate only one variable. First, the amount of water; this means the water in the experimental group is more or less than the control, hopefully not killing the experimental group, but just altering the growth rate of the experimental group compared to the control group. Second the amount of nutrients; nutrients can be varied if you have some plant food or fertilizer at home to use. Third, simulated herbivory is an interesting variable to use. If used herbivory as your experimental variable, decide on a pattern and amount of herbivory to inflict on the plants of the experimental group and write down the procedure in detail. Experiment to test how one of the following variables impacts the growth of Brassica rapa: Water, Nutrient Availability, and Herbivory. 1) Write down just one name of the variable. This is the independent variable. 2) Write down a question to address by manipulating the variable. 3) Next, formulate a hypothesis that…
- Two groups of tomatoes were grown under laboratoryconditions, one with humus added to the soil and one acontrol without humus. The leaves of the plants grownwithout humus were yellowish (less green) compared withthose of the plants grown in humus-enriched soil. The bestexplanation is that(A) the healthy plants used the food in the decomposing leavesof the humus for energy to make chlorophyll.(B) the humus made the soil more loosely packed, so waterpenetrated more easily to the roots.(C) the humus contained minerals such as magnesium andiron needed for the synthesis of chlorophyll.(D) the heat released by the decomposing leaves of the humuscaused more rapid growth and chlorophyll synthesis.Which of the following conditions were kept the same between the control group and the experimental group? Choose all that apply. A.)Incubation time B.)Temperature C.)Seed spacing D.)Light availability E.)Water availabilityIs green house effect is a natural phenomenon?
- Intraspecific competition is a competition between members of the same species and is commonly observed in crop plants. Table 6.2 shows the results of a greenhouse experiment which examined the effects of density on the germination and growth of barley. Plants were grown for two weeks in 10- cm diameter pots kept in identical environmental conditions and watered regularly. At the end of the experiment the plants were cropped by cutting the stems at the soil surface. Explain why knowledge of the effects in density is important to the crop farmer.Peacock Butterfly Predator Defenses The photographs below represent theexperimental and control groups used in the peacock butterfly experiment discussedin Section 1.6. See if you can identify the experimental groups and match them upwith the relevant control group(s). Hint: Identify which variable is being tested in eachgroup (each variable has a control).All other factors being held constant, increased carbon dioxide increases plant biomass; this is ____. At high temperatures (35C) C4 plants will respond more favorably to increased carbon dioxide compared to C3 plants; this is ____. Select one: a. true, false b. true, true c. false, false d. false, true