Chapter Exam

Chapter 9: Our Environment – Our Concern — Online MCQ Test

Q: Which of the following is NOT a trophic level in an ecosystem?

Answer: D. Apex predator — Apex predator is not a formal trophic level; it refers to a tertiary/secondary consumer at the top of a food chain. Producers, primary consumers, and decomposers are recognized trophic levels.

Q: Consider an aquatic ecosystem where algae → small fish → large fish → heron. If the heron population suddenly decreases, which population is most likely to increase significantly?

Answer: B. Small fish population — With fewer herons (top predator), the large fish that eat small fish face reduced predation pressure, allowing small fish to be consumed more. However, large fish survival improves, increasing their population, which intensifies predation on small fish—ultimately limiting small fish growth.

BIOLOGY · CLASS 10th · Telangana State Board

Practice Chapter 9: Our Environment – Our Concern with a free chapter-wise online MCQ test for Telangana State Board CLASS 10th BIOLOGY. This chapter covers: This chapter investigates ecological relationships energy flow and human impacts on ecosystems. It covers food chains food webs ecological pyramids (number biomass energy) bioaccum.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 9: Our Environment – Our Concern — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 10th BIOLOGY — Chapter 9: Our Environment – Our Concern, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is a food chain?

A. A linear sequence of organisms where each organism feeds on the previous one ✓
B. A group of animals living together in the same habitat
C. The total amount of food available in an ecosystem
D. A cycle of nutrients moving through the environment

Answer: A. A linear sequence of organisms where each organism feeds on the previous one
A food chain is a linear sequence showing the transfer of energy from one organism to another through feeding relationships.

Which of the following is NOT a trophic level in an ecosystem?

A. Producer
B. Primary consumer
C. Decomposer organism
D. Apex predator ✓

Answer: D. Apex predator
Apex predator is not a formal trophic level; it refers to a tertiary/secondary consumer at the top of a food chain. Producers, primary consumers, and decomposers are recognized trophic levels.

Which of the following best explains biomagnification?

A. The increase in concentration of a harmful substance as it moves up the food chain ✓
B. The total number of organisms in an ecosystem
C. The process of decomposition of organic matter
D. The movement of nutrients in a cycle through the ecosystem

Answer: A. The increase in concentration of a harmful substance as it moves up the food chain
Biomagnification is the accumulation and concentration of toxic substances at higher trophic levels, becoming more concentrated as it moves up the food chain.

Consider an aquatic ecosystem where algae → small fish → large fish → heron. If the heron population suddenly decreases, which population is most likely to increase significantly?

A. Algae population
B. Small fish population ✓
C. Large fish population
D. Both small and large fish populations equally

Answer: B. Small fish population
With fewer herons (top predator), the large fish that eat small fish face reduced predation pressure, allowing small fish to be consumed more. However, large fish survival improves, increasing their population, which intensifies predation on small fish—ultimately limiting small fish growth.

Which statement BEST describes the relationship between ecosystem degradation and plastic pollution as environmental concerns?

A. Plastic pollution only affects marine ecosystems and has no impact on terrestrial food chains
B. Plastic pollution disrupts food webs by entering all trophic levels, causing physical harm and chemical toxicity, accelerating ecosystem degradation ✓
C. Ecosystem degradation is caused only by habitat loss, not by plastic pollution
D. Plastic pollution improves soil quality, preventing further ecosystem degradation

Answer: B. Plastic pollution disrupts food webs by entering all trophic levels, causing physical harm and chemical toxicity, accelerating ecosystem degradation
Plastic pollution is a major driver of ecosystem degradation, entering food chains at all trophic levels and causing both physical blockages and chemical leaching that harm organisms and disrupt energy flow.