1. Which of the trophic levels below is not shown in the foodweb diagram? O   a. producers O   b. decomposers O   c. primary consumers O   d. secondary consumers

2. The illustration shows part of the carbon cycle. At position Y, carbon is most likely in which of the following forms? O   a. carbon dioxide O   b. carbohydrate O   c. carbon solid O   d. protein

This graph shows data on the average life expectancy of humans. Use the graph to answer questions 3 and 4.

3. What is the dependent variable on the graph?

O   a. Average Life Expectancy
O   b. Year
O   c. Changes in Life Expectancy
O   d. none of these

4. The change in life expectancy from 1910 to 1970 is most likely the result of

O   a. an increase in poor land-use management affecting the quality of soil
O   b. the introduction of technology that had a negative impact on air quality
O   c. the development and introduction of new techniques to control disease
O   d. a widespread increase in the presence of heavy metals in water supplies

5. When the single algal cell is cut in two as shown, the bottom part can grow into a complete cell, but the top part cannot. What conclusion is best supported? O   a. The ribosomes are found in the top of the cell. O   b. The nucleus is found in the bottom of the cell. O   c. The top of the cell contains most of the chromosomes. O   d. The bottom of the cell contains most of the cytoplasm.

6. The ingredients described are used to make a bonding agent. The most important safety precaution to take when applying this bonding agent is to O   a. dry it with a small flame O   b. work in a well-ventilated area O   c. cover the work area with newspaper O   d. wear a lab coat

7. The drawing represents the African Savannah. Which two species are in direct competition? O   a. zebras and lions O   b. giraffes and zebras O   c. birds and wildebeests O   d. wildebeests and zebras

8. After a two-day fishing tournament, it was observed that in one cove the bass caught were of an unusually small mass. An electric generating plant releases hot water into the cove. A group of high school ecology students measured the oxygen levels in the cove at the hot water release point, and every 100 yards along the stream of hot water until it reached the main part of the lake.

Which of these hypotheses had the students most likely formed before taking their measurements?

O   a. The electric generating plant releases hot water into the cove.
O   b. The small mass of the fish is caused by lack of oxygen in the water.
O   c. The fish in the cove do not have enough food.
O   d. The small mass of the fish is caused by plants clogging the cove.