NTA Environmental Science 2 — Questions and Answers
Question 1: What is the primary cause of the depletion of the ozone layer?
- Chlorofluorocarbons (CFCs) (Correct answer)
- Carbon dioxide
- Methane
- Sulfur dioxide
Correct answer: Chlorofluorocarbons (CFCs)
CFCs, once used in refrigerants and aerosols, release chlorine atoms in the stratosphere that destroy ozone molecules.
Question 2: Which of the following is an example of a non-renewable resource?
- Coal (Correct answer)
- Wind
- Solar
- Tidal energy
Correct answer: Coal
Coal is a fossil fuel formed over millions of years and cannot be replenished on a human timescale.
Question 3: The food chain begins with:
- Producers (plants) (Correct answer)
- Primary consumers
- Secondary consumers
- Decomposers
Correct answer: Producers (plants)
Producers, such as plants, are at the base of the food chain because they convert sunlight into chemical energy.
Question 4: What percentage of Earth's water is fresh water?
- About 3% (Correct answer)
- About 30%
- About 50%
- About 10%
Correct answer: About 3%
Only approximately 3% of Earth's water is fresh water; the remaining 97% is salt water.
Question 5: The EPA (Environmental Protection Agency) in the United States was established in which year?
- 1970 (Correct answer)
- 1960
- 1980
- 1990
Correct answer: 1970
The EPA was established in December 1970 under President Nixon to protect human health and the environment.
Question 6: Eutrophication of water bodies is mainly caused by excess:
- Nutrients (nitrogen and phosphorus) (Correct answer)
- Carbon dioxide
- Chlorine
- Heavy metals
Correct answer: Nutrients (nitrogen and phosphorus)
Excess nutrients from fertilizers cause algal blooms that deplete oxygen in water, leading to eutrophication.
NTA Environmental Science 2
What is the primary cause of the depletion of the ozone layer?