Name: ______Date: ______Period: ______

Unit 1 Practice Test

1. Human activities have dramatically changed the water cycle by

I. Increasing infiltration

II. Increasing surface runoff

III. Increasing condensation

  1. I onlyd. I and II only
  2. II onlye. II and III only
  3. III only

2. Carbon is released back into the environment by all of the following processes EXCEPT

  1. Burning fossil fuelsc. Respiration
  2. Decompositiond. Assimilation

3. The water cycle

I. Is powered by energy from the sun and gravity

II. Involves only liquid and gaseous phases

III. Is expected to cease due to global warming

  1. I onlyd. I and II only
  2. II onlye. I, II and III
  3. III only

4. Phosphorous is found in all of the following except

  1. Atmosphered. Shells
  2. Bonese. Terrestrial rocks
  3. Cell membrane

5. Nitrogen fixing bacteria would most likely be found in nodules on the roots of

  1. Opportunistic plantsd. Pine trees
  2. Shrubse. Legumes
  3. Grass

6. The primary environmental abiotic carbon source for the carbon cycle is

  1. The carbon dioxide in the air
  2. The carbon dioxide in the water
  3. The carbon monoxide in the air
  4. The carbon monoxide in the water
  5. The carbon dioxide in plants

7. CaCO3 is the compound of carbon that

I. Is condensed to form limestone

II. Is found in shells and skeletons of marine organisms

III. Is used for plants as a major source of nutrition

  1. I onlyd. I and III only
  2. II onlye. I, II and III
  3. I and II only

8. Phosphates are often the limiting factor for aquatic ecosystems because

  1. They don’t have a gaseous phase
  2. They aren’t as easily assimilated as nitrates are by plants
  3. The often form insoluble compounds
  4. They have no anthropogenic source
  5. They are relatively unstable molecules

9. The major reservoirs of phosphorous and carbon in the lithosphere exist in what forms respectively?

  1. Atmosphere, rocks
  2. Rocks, vegetation
  3. Rocks, atmosphere
  4. Animals, rocks
  5. Animals, animals

10. In the nitrogen cycle, the primary abiotic nitrogen source is/are

  1. The atmosphered. Nutrients
  2. The oceane. Plants
  3. The soil

11. Humans contribute to the increased sulfur in the atmosphere by

  1. Adding hydrogen sulfide into commercial fertilizers
  2. Burning coal and oil to produce electric power
  3. Cutting down trees and increasing erosion of sediments of sediments containing sulfur
  4. Producing dimethyl sulfide as a commercial fertilizer
  5. Being decayed by aerobic decomposers as dead matter and releasing hydrogen sulfide

12. Which of the following elements is most abundant in the atmosphere?

  1. Nitrogend. Helium
  2. Oxygene. Carbon
  3. Hydrogen

13. The process most responsible for continuous phosphorous release from rocks is

  1. Acid raind. Evaporation
  2. Earthquakese. Volcanic eruption
  3. Erosion

14. Carbon is restored to the environment by all of the following EXCEPT

  1. Cellular respiration
  2. Earthquakes
  3. Forest fires
  4. Precipitation
  5. Volcanic eruption

16. Which cycle does the most in shaping the earth’s landscape?

  1. Nitrogen cycled. Hydrological cycle
  2. Sulfur cyclee. Carbon cycle
  3. Phosphorous cycle

17. A sample of radioactive waste has a half-life of 10 years and an activity level of 2 curies. After how many years will the activity level of this sample be 0.25 curie?

  1. 10 yearsd. 40 years
  2. 20 yearse. 80 years
  3. 30 years

18. Which of the following is an inorganic compound?

  1. Ethanol (CH3COOH)
  2. Benzene (C6H6)
  3. Table salt (NaCl)
  4. Sucrose (C12H22O11)
  5. Propane (C3H8)

Additional textbook questions to practice:page 49, questions #2-4

Answer Key: 1-D, 2-D, 3-A, 4-A, 5-E, 6-A, 7-C, 8-C, 9-C, 10-A, 11-B, 12-A, 13-C, 14-D, 15-D, 16-C, 17-C

Textbook answers: 2-D, 3-E, 4-C