Ecosystem Quiz UPSC – 20 MCQs on Environment & Ecology

Ecosystem Quiz UPSC – 20 MCQs on Environment & Ecology with Answers

Get ready to test your preparation with this Ecosystem Quiz UPSC edition, specially crafted for the Environment & Ecology section. This quiz contains 20 multiple-choice questions (MCQs), covering key UPSC topics like food chains, energy flow, succession, and ecosystem services.

Each question has been selected to reflect the UPSC Prelims difficulty level, with a mix of medium and hard questions. All answers are followed by clear explanations to help you understand important concepts.

Use this quiz to assess your knowledge, revise smartly, and boost your Environment & Ecology score.

Which of the following is NOT a component of an ecosystem?

A. Energy

B. Decomposers

C. Pollutants

D. Consumers

In a food chain, energy transfer from one trophic level to the next is about:

A. 90%

B. 50%

C. 10%

D. 25%

Which biome has the highest biodiversity?

A. Tundra

B. Tropical rainforest

C. Desert

D. Taiga

Which of the following correctly describes a detritus food chain (DFC)?

A. Begins with herbivores

B. Involves energy flow from dead organic matter

C. Has primary producers as the first link

D. Involves only aquatic systems

Which ecosystem type is the most productive in terms of net primary productivity (NPP)?

A. Desert

B. Open ocean

C. Coral reefs

D. Tropical rainforest

In ecological succession, the final stable community is termed:

A. Pioneering community

B. Climax community

C. Transitional community

D. Temporary community

Which of the following is NOT correctly matched regarding ecosystem services?

A. Pollination – Regulating service

B. Carbon sequestration – Supporting service

C. Aesthetic value – Cultural service

D. Nutrient cycling – Supporting service

The pyramid of biomass in a sea ecosystem is:

A. Always upright

B. Always inverted

C. Upright at all levels

D. None of the above

Which of the following is a biotic component of an ecosystem?

A. Water

B. Soil

C. Bacteria

D. Light

Which ecosystem has the lowest productivity?

A. Estuary

B. Desert

C. Grassland

D. Tropical rainforest

An ecosystem that can maintain its structure and function despite disturbances is said to have:

A. Fragility

B. Resistance

C. Complexity

D. Diversity

In which of the following does primary succession occur?

A. Abandoned cropland

B. Forest clearings

C. Lava flows

D. Burned forest

The term "Ecotone" refers to:

A. A type of ecosystem

B. A decomposer in an ecosystem

C. A transitional zone between two ecosystems

D. The bottom layer of the ocean

Which of the following best describes Net Primary Productivity (NPP)?

A. Total energy captured by plants

B. Energy transferred to herbivores

C. Gross Primary Productivity minus energy used by plants

D. Energy stored in decomposers

Which of the following ecosystem types has the greatest carbon storage?

A. Tropical rainforest

B. Peatlands and wetlands

C. Coral reefs

D. Mangroves

What is the main reason that energy flow in an ecosystem is unidirectional?

A. Energy is recycled in nature

B. Energy is lost as heat in each step

C. Organisms are unable to store energy

D. Plants do not trap energy

Which of the following organisms forms the first trophic level in most ecosystems?

A. Herbivores

B. Carnivores

C. Producers

D. Decomposers

Which one of the following shows a correct sequence in the food chain?

A. Insects → Grass → Frog → Snake

B. Grass → Insects → Frog → Snake

C. Snake → Frog → Insects → Grass

D. Frog → Insects → Grass → Snake

Which concept explains why no two species can occupy the same niche indefinitely in an ecosystem?

A. Law of thermodynamics

B. Competitive exclusion principle

C. Gaia hypothesis

D. Resource partitioning theory

What is the role of keystone species in an ecosystem?

A. They are the largest in population

B. They are primary producers

C. They control the ecosystem structure and function

D. They are always predators

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Ecosystem Quiz UPSC – 20 MCQs on Environment & Ecology with Answers

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