science icon Name ________________________________
A glucose-tolerance test was conducted to observe the effect of time on glucose concentration in the blood. An animal was fed 10 ml of glucose solution. At five different times after the ingestion of the solution, the blood glucose concentration was measured, and the results were recorded in the data table shown.

Add appropriate scales and labels to the grid, plot the data, and draw a line graph.
Use the data and graph to answer the following questions.

1. The units of the dependent variable are ______________________________.

2. The change in glucose concentration in the blood between 0 and 30 minutes was probably due to

O   A. the liver releasing glucose into the small intestine
O   B. the synthesis of glucose from starch
O   C. glucose being absorbed from the digestive system
O   D. glucose being used for cellular respiration
3. The constant decrease in glucose concentration in the blood after the 30 minute mark is probably due to
O   A. the liver releasing glucose into the small intestine
O   B. the synthesis of glucose from starch
O   C. glucose being absorbed from the digestive system
O   D. glucose being used for cellular respiration
4. An additional glucose measurement was taken at 200 minutes, showing a blood glucose level of 80 mg/100 dL. This rise in glucose level was most likely caused by
O   A. the liver releasing glucose into the small intestine
O   B. the synthesis of glucose from starch
O   C. glucose being absorbed from the digestive system
O   D. glucose being used for cellular respiration

 

A small green plant was placed in a flask as shown in the diagram below. A sensor that measures the CO2 content of the air in the flask was inserted, and then the flask was sealed with a rubber stopper. The other end of the sensor was connected to a computer to monitor and record CO2 levels in the flask over a period of time.

For part of the time the flask was placed in bright light and for part of the time it was placed in total darkness. The accompanying graph shows data that were recorded by the sensor over a period of time.

5. Based on the given information and your knowledge of biology, which condition most likely produced the effect on CO2 level over the first 23 minutes?

O   A. The light was on for the entire 23 minutes.
O   B. The light was off at the start and turned on after 10 minutes.
O   C. The light was off for the entire 23 minutes.
O   D. The light could have been either on or off because it would have had no effect on the CO2 level.
6. Based on the given information and your knowledge of biology, which process most likely caused the change in CO2 level in the flask over the last 37 minutes?
O   A. photosynthesis
O   B. active transport
O   C. respiration
O   D. circulation
7. A CO2 level of 500 ppm means there is one molecule of CO2 per million molecules of
O   A. oxygen
O   B. nitrogen
O   C. water
O   D. gas in the flask
8. The vertical line drawn at 23 minutes on the graph represents this event.
O   A. beginning the experiment
O   B. adding the plant to the flask
O   C. flipping the light switch
O   D. changing the CO2 sensor