Characteristics of Life & Scientific Investigation (2)

Master life's traits & scientific investigation! Learn variables, graphs, and homeostasis.

Graphs and Charts Use the graph below to answer the questions that follow: 1. Which score was the most abundant score for this group of students? 802. Which score was the least abundant score for this group of students? 1003. How many students scored a 70%? 34. How many students scored an 80%? 6 A student constructs several terrariums like the one shown below. Each terrarium is exposed to a different amount of sunlight each day. In order to determine the ideal amount of sunlight, which of the following variables must be held constant? Type of Plant Growth Rate of Plants Amount of sunlight received Experiments do not need a constant What is the independent variable in the experiment above? Growth rate of plants Amount of sunlight each terrarium is exposed to What is the dependent variable in this experiment? Growth rate of plants Amount of sunlight each terrarium is exposed to Matching Parts of an Experiment Use the experiment below to match the parts of the experiment.Three groups of rats are fed identical diets except for the amount of vitamin A that they receive. Each group gets a different amount of vitamin A. Group 1 gets an average amount, Group 2 gets a high amount, and Group 3 gets a low amount. After 3 weeks on the diet, the rats are weighed to see if the amount of vitamin A received has affected their weight. Control group Group 1 (average amount) Experimental Groups Group 2 and Group 3 Independent Variable Amount of Vitamin A Dependent Variable The weight of the rats Constant Same type of rat Quantitative Data The rats in Group 2 weighed ten pounds more. Qualitative Data The rats in Group 3 looked very skinny compared to the other rats. Independent Variable Goes on the X axis What is being changed in an experiment What you can control Dependent Variable Goes on the Y axis What is being measured in an experiment Depends on the independent variable Blood Sugar Level The graph above shows how the body adjusts it's insulin levels based on the amount of glucose (sugar) present. The ability for organisms to keep a stable internal environment (or balance in the body) is known as: Heredity Homeostasis Metabolism Stimuli Humans perspire (sweat) when they are hot. What is the purpose of this? (Hint: choose 2 answers) To control body temperature To cool down the skin To clean the skin To make you smell good Which is not required by all living organisms? Energy Cells Oxygen Reproduction