Chapter Exam

Chapter 13: Environmental Issues — Online MCQ Test

Q: Which of the following is a major cause of air pollution?

Answer: B. Burning of fossil fuels — Burning fossil fuels releases harmful gases and particulate matter into the atmosphere, causing air pollution.

Q: BOD stands for:

Answer: A. Biological Oxygen Demand — BOD means Biological Oxygen Demand, which indicates the amount of oxygen required by microorganisms to decompose organic matter in water.

Q: An increase in nutrient content in water bodies due to runoff from fertilizers is called:

Answer: A. Eutrophication — Eutrophication occurs when excess nutrients enter water bodies, promoting algal growth and reducing oxygen levels.

Q: A farmer repeatedly uses excess chemical fertilizers and pesticides. Which environmental problem is most likely to occur in nearby soil and water?

Answer: B. Soil and water contamination — Excess fertilizers and pesticides can seep into soil and runoff into water bodies, causing contamination.

ZOOLOGY · CLASS 12th · Tamil Nadu State Board

Practice Chapter 13: Environmental Issues with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th ZOOLOGY. This chapter covers: The final chapter details environmental pollution issues including air water and soil contamination solid waste management bioaccumulation global warming and deforestation conseque.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 13: Environmental Issues — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th ZOOLOGY — Chapter 13: Environmental Issues, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is a major cause of air pollution?

A. Deforestation
B. Burning of fossil fuels ✓
C. Rainwater harvesting
D. Composting of kitchen waste

Answer: B. Burning of fossil fuels
Burning fossil fuels releases harmful gases and particulate matter into the atmosphere, causing air pollution.

BOD stands for:

A. Biological Oxygen Demand ✓
B. Biochemical Oxygen Deposition
C. Basic Oxygen Distribution
D. Bacterial Oxygen Demand

Answer: A. Biological Oxygen Demand
BOD means Biological Oxygen Demand, which indicates the amount of oxygen required by microorganisms to decompose organic matter in water.

An increase in nutrient content in water bodies due to runoff from fertilizers is called:

A. Eutrophication ✓
B. Biomagnification
C. Desertification
D. Sedimentation

Answer: A. Eutrophication
Eutrophication occurs when excess nutrients enter water bodies, promoting algal growth and reducing oxygen levels.

A farmer repeatedly uses excess chemical fertilizers and pesticides. Which environmental problem is most likely to occur in nearby soil and water?

A. Only increase in rainfall
B. Soil and water contamination ✓
C. Formation of ozone layer
D. Decrease in salinity of all soil

Answer: B. Soil and water contamination
Excess fertilizers and pesticides can seep into soil and runoff into water bodies, causing contamination.

Which of the following is the most appropriate match?

A. Bioaccumulation — increase of toxins at higher trophic levels only ✓
B. Eutrophication — decrease in nutrient content of water
C. Deforestation — increase in soil fertility
D. Air pollution — contamination only by solid waste

Answer: A. Bioaccumulation — increase of toxins at higher trophic levels only
Bioaccumulation refers to the accumulation of harmful substances in an organism, and these substances can be found in greater concentration at higher trophic levels through food chains.