Chapter Exam

Chapter-15 Environmental Science — Online MCQ Test

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

Answer: B. Burning fossil fuels — Burning fossil fuels releases harmful gases and smoke into the atmosphere. This is a major source of air pollution.

Q: Biodiversity means the variety of ____ in a given area.

Answer: C. living organisms — Biodiversity refers to the variety of plants, animals, and microorganisms in an ecosystem or region.

SCIENCE · Samacheer Kalvi 9th · Tamil Nadu State Board

Practice Chapter-15 Environmental Science with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 9th SCIENCE. This chapter covers: Description Explains pollution conservation biodiversity and sustainable development practices Keywords Pollution Conservation Sustainability Environment Biodiversity. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-15 Environmental Science — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 9th SCIENCE — Chapter-15 Environmental Science, 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. Planting more trees
B. Burning fossil fuels ✓
C. Rainwater harvesting
D. Recycling paper

Answer: B. Burning fossil fuels
Burning fossil fuels releases harmful gases and smoke into the atmosphere. This is a major source of air pollution.

Biodiversity means the variety of ____ in a given area.

A. rocks and minerals
B. climate changes
C. living organisms ✓
D. soil layers

Answer: C. living organisms
Biodiversity refers to the variety of plants, animals, and microorganisms in an ecosystem or region.

Which of the following best helps in reducing solid waste?

A. Throwing all waste into one bin
B. Burning plastic waste openly
C. Segregating biodegradable and non-biodegradable waste ✓
D. Dumping waste in water bodies

Answer: C. Segregating biodegradable and non-biodegradable waste
Segregation helps in proper treatment and disposal of different types of waste. It also supports recycling and composting.

Which of the following pairs is correctly matched?

A. Reuse - using a plastic bottle once and throwing it away
B. Recycle - converting waste into a new useful product ✓
C. Reduce - increasing the use of resources
D. Conserve - wasting electricity

Answer: B. Recycle - converting waste into a new useful product
Recycling means processing waste materials to make new products. The other options do not match the correct environmental terms.

A student compares two practices: burning waste and composting kitchen waste. Which statement is correct?

A. Both are equally eco-friendly
B. Burning waste is better because it destroys all waste quickly
C. Composting is better because it converts biodegradable waste into useful manure ✓
D. Composting increases air pollution

Answer: C. Composting is better because it converts biodegradable waste into useful manure
Composting is an eco-friendly method for biodegradable waste. It produces manure and reduces the burden on landfills.