MCQs - Components of Environment Degree-level - Environmental Scientist - TNPSC

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MCQs on the Components of Environment suitable for Degree-level

Answers are given below with Explanations


1. Which of the following is NOT a biotic component of the environment?

A) Plants
B) Microorganisms
C) Soil
D) Animals

2. The atmosphere is primarily composed of which two gases?

A) Oxygen and Hydrogen
B) Nitrogen and Oxygen
C) Carbon dioxide and Nitrogen
D) Argon and Oxygen

3. Which component of the environment provides essential minerals and supports plant growth?

A) Hydrosphere
B) Lithosphere
C) Atmosphere
D) Biosphere

4. Which of the following best defines the term 'biosphere'?

A) The zone of air surrounding Earth
B) The total living organisms on Earth and their habitats
C) The area covered by water
D) The part of the Earth’s crust

Answer: B) The total living organisms on Earth and their habitats
Explanation: The biosphere includes all ecosystems and living beings on Earth.

5. Which of the following interactions is abiotic–biotic in nature?

A) A lion hunting a deer
B) A tree absorbing sunlight
C) Fungi growing on decaying matter
D) A fish eating plankton

6. Which of the following is NOT part of the hydrosphere?

A) Oceans
B) Rivers
C) Ice caps
D) Sand dunes

7. The term 'environment' includes:

A) Only physical surroundings
B) Only living beings
C) Both biotic and abiotic components
D) Only human-created structures

8. The component responsible for weather and climate regulation is:

A) Lithosphere
B) Biosphere
C) Atmosphere
D) Hydrosphere

9. Which of the following correctly matches a component and its function?

A) Hydrosphere – gas exchange
B) Lithosphere – oxygen generation
C) Atmosphere – temperature regulation
D) Biosphere – water storage

10. Which of the following statements is true?

A) Abiotic factors do not affect living organisms
B) Only biotic components form ecosystems
C) The environment is static and unchanging
D) All components of the environment are interdependent


ANSWERS:

1. Which of the following is NOT a biotic component of the environment?

A) Plants
B) Microorganisms
C) Soil
D) Animals

Answer: C) Soil
Explanation: Soil is an abiotic (non-living) component.

2. The atmosphere is primarily composed of which two gases?

A) Oxygen and Hydrogen
B) Nitrogen and Oxygen
C) Carbon dioxide and Nitrogen
D) Argon and Oxygen

Answer: B) Nitrogen and Oxygen
Explanation: Nitrogen (~78%) and Oxygen (~21%) make up the bulk of Earth's atmosphere.

3. Which component of the environment provides essential minerals and supports plant growth?

A) Hydrosphere
B) Lithosphere
C) Atmosphere
D) Biosphere

Answer: B) Lithosphere
Explanation: The lithosphere (Earth’s crust) contains soil and minerals required for plants.

4. Which of the following best defines the term 'biosphere'?

A) The zone of air surrounding Earth
B) The total living organisms on Earth and their habitats
C) The area covered by water
D) The part of the Earth’s crust

Answer: B) The total living organisms on Earth and their habitats
Explanation: The biosphere includes all ecosystems and living beings on Earth.

5. Which of the following interactions is abiotic–biotic in nature?

A) A lion hunting a deer
B) A tree absorbing sunlight
C) Fungi growing on decaying matter
D) A fish eating plankton

Answer: B) A tree absorbing sunlight
Explanation: This is an interaction between a biotic component (tree) and an abiotic component (sunlight).

6. Which of the following is NOT part of the hydrosphere?

A) Oceans
B) Rivers
C) Ice caps
D) Sand dunes

Answer: D) Sand dunes
Explanation: Sand dunes are part of the lithosphere, not the hydrosphere.

7. The term 'environment' includes:

A) Only physical surroundings
B) Only living beings
C) Both biotic and abiotic components
D) Only human-created structures

Answer: C) Both biotic and abiotic components
Explanation: Environment consists of living (biotic) and non-living (abiotic) elements.

8. The component responsible for weather and climate regulation is:

A) Lithosphere
B) Biosphere
C) Atmosphere
D) Hydrosphere

Answer: C) Atmosphere
Explanation: The atmosphere plays a key role in climate and weather patterns.

9. Which of the following correctly matches a component and its function?

A) Hydrosphere – gas exchange
B) Lithosphere – oxygen generation
C) Atmosphere – temperature regulation
D) Biosphere – water storage

Answer: C) Atmosphere – temperature regulation
Explanation: The atmosphere helps regulate Earth’s temperature through greenhouse gases and cloud cover.

10. Which of the following statements is true?

A) Abiotic factors do not affect living organisms
B) Only biotic components form ecosystems
C) The environment is static and unchanging
D) All components of the environment are interdependent

Answer: D) All components of the environment are interdependent
Explanation: Biotic and abiotic factors interact closely and affect each other in ecosystems.

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