Bio8: Experimental Design

A student divided some insect larvae into four equal groups, each having the same amount of food. Each group was kept at a different temperature, and the average length of the larvae was determined after each shedding of the exoskeleton (molt). The data obtained are shown in the data table below. According to the data, the most favorable temperature for total growth in these larvae is

• 15°C

• 20°C

• 25°C

• 30°C

Tags

NGSS.MS-LS1-5

An investigation was conducted using three groups of laboratory rats, X, Y, and Z, to determine the relative effects of glucose and adrenaline on the rate of heartbeat. The experimental conditions for each group of rats were kept the same except for the type of solution injected, as shown in the data table below. According to the data table, which group of rats functioned as the control?

• X, only

• Y, only

• Z, only

• both X and Y

Tags

NGSS.MS-PS1-2

In one of his experiments with pea plants, Mendel noted that 75% of the offspring of a certain cross had green pea pods. This statement would be considered

• an observation

• an inference

• a hypothesis

• a conclusion

Graphs of the data from laboratory investigations are used to

• make the observed data more accurate

• observe general trends in the data

• prevent errors in measuring data

• help change the original data tables

Tags

NGSS.MS-PS3-1

A new drug for the treatment of asthma is tested on 100 people. The people are evenly divided into two groups. One group is given the drug, and the other group is given a glucose pill. The group that is given the glucose pill serves as the

• experimental group

• limiting factor

• indicator

• control group

Which relationship can correctly be inferred from the data presented in the graphs below?

• As sewage waste increases, oxygen content decreases.

• As sewage waste increases, oxygen content increases.

• As oxygen content decreases, carp population decreases.

• As oxygen content decreases, trout population increases.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Diagrams, tables, and graphs are used by scientists mainly to

• design a research plan for an experiment

• test a hypothesis

• organize data

• predict the independent variable

Tags

NGSS.MS-PS3-1

The rate of respiration of a freshwater sunfish was determined at different temperatures. The rate of respiration was determined by counting the number of times the gill covers of the fish opened and closed during 1-minute intervals at the various temperatures. If a graph was constructed using the information in the table, which title would be appropriate for the graph?

• The Effect of Temperature on Rate of Respiration in Sunfish

• The Effect of Gill Movement on Rate of Respiration in Sunfish

• The Relationship Between Temperature and Dissolved Oxygen

• The Relationship Between Sunfish Population and Temperature Change in Freshwater Habitats

A student counted the total number of leaves in a group of duckweed plants (Lemna gibba) over a 5-day period. The data collected are shown in the table below. The time it takes for the number of leaves to increase from 15 to 30 is approximately

• 2.0 days

• 2.3 days

• 2.9 days

• 3.2 days

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

In an investigation, students determined the average rate of movement of gill covers of a species of freshwater fish at different temperatures. The results are shown in the data table below. Which labeled axes should be used to graph the relationship shown between the two variables?

• 
• 
• 
• 

Tags

NGSS.MS-PS3-4