Unit Test — Unit test Answers

In late spring, a student began conducting an investigation about the flower preferences of bees. She counted the number of wildflowers in a small plot and created the following table.Plant SpeciesNumber of PlantsDandelion13Indian paintbrush8Queen Anne’s lace20Thistle29She planned to observe the flowers for the next five days for an hour at the same time each afternoon. Then she would plot the data in a multiple line graph to compare the number of bees that visited each flower. Which statement best describes the data in this investigation?

A student does an experiment for a science fair to study whether temperature affects the timing of a cricket’s chirps. The student keeps a cricket in an enclosed box that is heated to different temperatures each day for twelve days. The student records the cricket’s chirps by using a sound-activated microphone so that the timing of the chirps can be measured. The student records the results of the experiment in the table below.Day123456789101112Temperature (ºC)212223242526272829303132Average time between chirps (sec)2.52.62.22.32.01.81.91.81.41.21.51.1Which generalization can be made from the data in the table?

Density is mass per unit of volume. Which pair of lab instruments would a student use to measure the density of seawater?

The excerpt is from an article that Roberto read for science class called “Using the Scientific Method to Study Tomatoes.” The student performed an experiment to test his hypothesis about sunlight and plant height using two plants. He kept everything the same between two tomato plants except he exposed them to different amounts of sunlight. He also used a third plant as a control group, or a group in which no variables are manipulated to confirm the results.Roberto critiqued the work. Which problem did Roberto most likely identify?

Read the passage below. It summarizes survey information.The Global Youth Tobacco Survey asks youth to fill in the answers to several questions about their tobacco use. In this survey conducted between 2000 and 2007, it was found that in youth ages 13-15, 12 percent of boys and 7 percent of girls reported smoking cigarettes. This information was shared and reported on the American Cancer Society website. The information was then used by several industries in the fields of health care, insurance, and education.What is a reason that these data may be unreliable?