1. Geological Time Scale
  1. Use the diagram to answer the questions in the box.

  1. Describe the endosymbiotic theory and how do cells become more complex over time?
  1. Does this occur in long or short period of time?

12A

Level 4

4. According to the information in the box, which of these best describes the relationship between rhizobia and bean plants?

a)Parasitism

b)Opportunism

c)Commensalism

d)Mutualism

12A

5. A tick crawling up a dog can eventually lead to what kind of relationship?

a)commensalism

b)parasitism

c)neutralisim

d)mutualism

12A

6. Insecticides help humans compete with insects for a resource. Which resource is most likely to be preserved for humans through the use of insecticides?

a)Sunlight

b)Water

c)Food

d)Air

7. According to the diagram above, where do fossil fuels ultimately receive their energy from?

a)Plants

b)Herbivores

c)Carnivores

d)The sun

11C

8. In the diagram above, bacteria convert ammonium in the water into less harmful substances that plants can use. Which of the following statements accurately summarizes the role of the bacteria in the fish tank?

A. The bacteria are necessary to balance the fish tank.

B. Bacteria probably are doing this out in nature also.

C. The bacteria would rot the fish if it died.

D. The plant uses what the bacteria make.

12 c

9. In an experiment, chickens were fed grain that contained a chemical marker in its proteins. The presence of the marker can be detected in organisms. Which of the following is the most reasonable prediction from this experiment?

  1. The marker will only be found in the grain.
  2. Both chickens and wolves will have the marker.
  3. Wolves will have the marker, but chickens will not.
  4. The marker will only be found in the animal's waste.

12c

Figure 10

10. Figure 10 shows a food web arranged into trophic levels. How many energy-transferring steps away from the sun is the deer?

  1. One
  2. Two
  3. Three
  4. Four

12c

11. Some organisms' position in the food chain can vary as their diet differs. For example, when a bear eats a plant-eating rodent, the bear is functioning as a secondary consumer. When a bear eats berries, the bear is functioning as a ______.

  1. Detrivore
  2. Tertiary consumer
  3. Primary consumer
  4. Decomposer

12D

12. If a population grows larger than the carrying capacity of the environment, the

  1. death rate will reach equilibrium.
  2. birth rate will rise.
  3. birth rate will not change
  4. death rate may increase.
12 E
13. A carrot plant is exposed to carbon dioxide containing radioactive carbon for 24 hours. After this exposure, the carrot roots are found to have accumulated radioactivity. These carrots are then fed to a rabbit. One week later, the rabbit's tissue is tested for radioactivity and is found to have a higher than normal background count. Which biogeochemical cycle is apparent from this study?
  1. oxygen
  2. carbon
  3. water
  4. nitrogen