Free MCQs with Answers | Military Brat Defence Academy

QID #24648 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Biology Medium

How is Natural selection best explained?

Correct Answer: B. favours heritable traits that improve reproductive success
Natural selection favours heritable traits that improve reproductive success. The other choices describe different concepts.

Question: How is Natural selection best explained?

A. is the cellular site of protein synthesis

B. favours heritable traits that improve reproductive success

C. stores hereditary information in most organisms

D. is a major site of aerobic energy production in eukaryotic cells

Correct Answer: B. favours heritable traits that improve reproductive successExplanation: Natural selection favours heritable traits that improve reproductive success. The other choices describe different concepts.

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QID #24647 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Biology Medium

How is Ecosystem best explained?

Correct Answer: A. includes organisms and their physical environment interacting together
Ecosystem includes organisms and their physical environment interacting together. The other choices describe different concepts.

Question: How is Ecosystem best explained?

A. includes organisms and their physical environment interacting together

B. is the basic structural and functional unit of life

C. is a biological agent capable of causing disease

D. favours heritable traits that improve reproductive success

Correct Answer: A. includes organisms and their physical environment interacting togetherExplanation: Ecosystem includes organisms and their physical environment interacting together. The other choices describe different concepts.

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QID #24646 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Biology Medium

How is Pathogen best explained?

Correct Answer: D. is a biological agent capable of causing disease
Pathogen is a biological agent capable of causing disease. The other choices describe different concepts.

Question: How is Pathogen best explained?

A. induces immune memory without causing the target disease

B. is required for collagen synthesis and wound healing

C. is an immunoglobulin that recognizes a specific antigen

D. is a biological agent capable of causing disease

Correct Answer: D. is a biological agent capable of causing diseaseExplanation: Pathogen is a biological agent capable of causing disease. The other choices describe different concepts.

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QID #24645 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Biology Medium

How is Vaccine best explained?

Correct Answer: C. induces immune memory without causing the target disease
Vaccine induces immune memory without causing the target disease. The other choices describe different concepts.

Question: How is Vaccine best explained?

A. filters blood and regulates water and electrolyte balance

B. performs metabolism, detoxification and bile production

C. induces immune memory without causing the target disease

D. supports calcium absorption and bone mineralization

Correct Answer: C. induces immune memory without causing the target diseaseExplanation: Vaccine induces immune memory without causing the target disease. The other choices describe different concepts.

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QID #24644 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Biology Medium

How is Antibody best explained?

Correct Answer: B. is an immunoglobulin that recognizes a specific antigen
Antibody is an immunoglobulin that recognizes a specific antigen. The other choices describe different concepts.

Question: How is Antibody best explained?

A. is the principal signalling cell of the nervous system

B. is an immunoglobulin that recognizes a specific antigen

C. helps lower blood glucose by promoting uptake and storage

D. transports most oxygen in human blood

Correct Answer: B. is an immunoglobulin that recognizes a specific antigenExplanation: Antibody is an immunoglobulin that recognizes a specific antigen. The other choices describe different concepts.

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QID #24643 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Biology Medium

How is Vitamin C best explained?

Correct Answer: A. is required for collagen synthesis and wound healing
Vitamin C is required for collagen synthesis and wound healing. The other choices describe different concepts.

Question: How is Vitamin C best explained?

A. is required for collagen synthesis and wound healing

B. converts light energy into chemical energy in green plants

C. produces genetically similar daughter cells for growth and repair

D. reduces chromosome number during gamete formation

Correct Answer: A. is required for collagen synthesis and wound healingExplanation: Vitamin C is required for collagen synthesis and wound healing. The other choices describe different concepts.

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QID #24642 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Biology Medium

How is Vitamin D best explained?

Correct Answer: D. supports calcium absorption and bone mineralization
Vitamin D supports calcium absorption and bone mineralization. The other choices describe different concepts.

Question: How is Vitamin D best explained?

A. is a functional unit of heredity encoded in nucleic acid

B. is the cellular site of protein synthesis

C. stores hereditary information in most organisms

D. supports calcium absorption and bone mineralization

Correct Answer: D. supports calcium absorption and bone mineralizationExplanation: Vitamin D supports calcium absorption and bone mineralization. The other choices describe different concepts.

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QID #24641 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Biology Medium

How is Liver best explained?

Correct Answer: C. performs metabolism, detoxification and bile production
Liver performs metabolism, detoxification and bile production. The other choices describe different concepts.

Question: How is Liver best explained?

A. favours heritable traits that improve reproductive success

B. is the basic structural and functional unit of life

C. performs metabolism, detoxification and bile production

D. is a major site of aerobic energy production in eukaryotic cells

Correct Answer: C. performs metabolism, detoxification and bile productionExplanation: Liver performs metabolism, detoxification and bile production. The other choices describe different concepts.

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QID #24640 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Biology Medium

How is Kidney best explained?

Correct Answer: B. filters blood and regulates water and electrolyte balance
Kidney filters blood and regulates water and electrolyte balance. The other choices describe different concepts.

Question: How is Kidney best explained?

A. is a biological agent capable of causing disease

B. filters blood and regulates water and electrolyte balance

C. includes organisms and their physical environment interacting together

D. induces immune memory without causing the target disease

Correct Answer: B. filters blood and regulates water and electrolyte balanceExplanation: Kidney filters blood and regulates water and electrolyte balance. The other choices describe different concepts.

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QID #24639 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Biology Medium

How is Insulin best explained?

Correct Answer: A. helps lower blood glucose by promoting uptake and storage
Insulin helps lower blood glucose by promoting uptake and storage. The other choices describe different concepts.

Question: How is Insulin best explained?

A. helps lower blood glucose by promoting uptake and storage

B. is an immunoglobulin that recognizes a specific antigen

C. supports calcium absorption and bone mineralization

D. is required for collagen synthesis and wound healing

Correct Answer: A. helps lower blood glucose by promoting uptake and storageExplanation: Insulin helps lower blood glucose by promoting uptake and storage. The other choices describe different concepts.

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QID #24638 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Biology Medium

How is Neuron best explained?

Correct Answer: D. is the principal signalling cell of the nervous system
Neuron is the principal signalling cell of the nervous system. The other choices describe different concepts.

Question: How is Neuron best explained?

A. performs metabolism, detoxification and bile production

B. helps lower blood glucose by promoting uptake and storage

C. filters blood and regulates water and electrolyte balance

D. is the principal signalling cell of the nervous system

Correct Answer: D. is the principal signalling cell of the nervous systemExplanation: Neuron is the principal signalling cell of the nervous system. The other choices describe different concepts.

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QID #24637 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Biology Medium

How is Haemoglobin best explained?

Correct Answer: C. transports most oxygen in human blood
Haemoglobin transports most oxygen in human blood. The other choices describe different concepts.

Question: How is Haemoglobin best explained?

A. reduces chromosome number during gamete formation

B. converts light energy into chemical energy in green plants

C. transports most oxygen in human blood

D. is the principal signalling cell of the nervous system

Correct Answer: C. transports most oxygen in human bloodExplanation: Haemoglobin transports most oxygen in human blood. The other choices describe different concepts.

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QID #24636 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Biology Medium

How is Photosynthesis best explained?

Correct Answer: B. converts light energy into chemical energy in green plants
Photosynthesis converts light energy into chemical energy in green plants. The other choices describe different concepts.

Question: How is Photosynthesis best explained?

A. is a functional unit of heredity encoded in nucleic acid

B. converts light energy into chemical energy in green plants

C. produces genetically similar daughter cells for growth and repair

D. stores hereditary information in most organisms

Correct Answer: B. converts light energy into chemical energy in green plantsExplanation: Photosynthesis converts light energy into chemical energy in green plants. The other choices describe different concepts.

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QID #24635 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Biology Medium

How is Meiosis best explained?

Correct Answer: A. reduces chromosome number during gamete formation
Meiosis reduces chromosome number during gamete formation. The other choices describe different concepts.

Question: How is Meiosis best explained?

A. reduces chromosome number during gamete formation

B. is the cellular site of protein synthesis

C. is the basic structural and functional unit of life

D. is a major site of aerobic energy production in eukaryotic cells

Correct Answer: A. reduces chromosome number during gamete formationExplanation: Meiosis reduces chromosome number during gamete formation. The other choices describe different concepts.

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QID #24634 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Biology Medium

How is Mitosis best explained?

Correct Answer: D. produces genetically similar daughter cells for growth and repair
Mitosis produces genetically similar daughter cells for growth and repair. The other choices describe different concepts.

Question: How is Mitosis best explained?

A. favours heritable traits that improve reproductive success

B. is a biological agent capable of causing disease

C. includes organisms and their physical environment interacting together

D. produces genetically similar daughter cells for growth and repair

Correct Answer: D. produces genetically similar daughter cells for growth and repairExplanation: Mitosis produces genetically similar daughter cells for growth and repair. The other choices describe different concepts.

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QID #24633 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Biology Medium

How is Gene best explained?

Correct Answer: C. is a functional unit of heredity encoded in nucleic acid
Gene is a functional unit of heredity encoded in nucleic acid. The other choices describe different concepts.

Question: How is Gene best explained?

A. is required for collagen synthesis and wound healing

B. is an immunoglobulin that recognizes a specific antigen

C. is a functional unit of heredity encoded in nucleic acid

D. induces immune memory without causing the target disease

Correct Answer: C. is a functional unit of heredity encoded in nucleic acidExplanation: Gene is a functional unit of heredity encoded in nucleic acid. The other choices describe different concepts.

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QID #24632 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Biology Medium

How is DNA best explained?

Correct Answer: B. stores hereditary information in most organisms
DNA stores hereditary information in most organisms. The other choices describe different concepts.

Question: How is DNA best explained?

A. performs metabolism, detoxification and bile production

B. stores hereditary information in most organisms

C. supports calcium absorption and bone mineralization

D. filters blood and regulates water and electrolyte balance

Correct Answer: B. stores hereditary information in most organismsExplanation: DNA stores hereditary information in most organisms. The other choices describe different concepts.

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QID #24631 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Biology Medium

How is Ribosome best explained?

Correct Answer: A. is the cellular site of protein synthesis
Ribosome is the cellular site of protein synthesis. The other choices describe different concepts.

Question: How is Ribosome best explained?

A. is the cellular site of protein synthesis

B. helps lower blood glucose by promoting uptake and storage

C. transports most oxygen in human blood

D. is the principal signalling cell of the nervous system

Correct Answer: A. is the cellular site of protein synthesisExplanation: Ribosome is the cellular site of protein synthesis. The other choices describe different concepts.

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QID #24630 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Biology Medium

How is Mitochondrion best explained?

Correct Answer: D. is a major site of aerobic energy production in eukaryotic cells
Mitochondrion is a major site of aerobic energy production in eukaryotic cells. The other choices describe different concepts.

Question: How is Mitochondrion best explained?

A. converts light energy into chemical energy in green plants

B. produces genetically similar daughter cells for growth and repair

C. reduces chromosome number during gamete formation

D. is a major site of aerobic energy production in eukaryotic cells

Correct Answer: D. is a major site of aerobic energy production in eukaryotic cellsExplanation: Mitochondrion is a major site of aerobic energy production in eukaryotic cells. The other choices describe different concepts.

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QID #24629 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Biology Medium

How is Cell best explained?

Correct Answer: C. is the basic structural and functional unit of life
Cell is the basic structural and functional unit of life. The other choices describe different concepts.

Question: How is Cell best explained?

A. is the cellular site of protein synthesis

B. stores hereditary information in most organisms

C. is the basic structural and functional unit of life

D. is a functional unit of heredity encoded in nucleic acid

Correct Answer: C. is the basic structural and functional unit of lifeExplanation: Cell is the basic structural and functional unit of life. The other choices describe different concepts.

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Free MCQs with Answers | Military Brat Defence Academy

How is Natural selection best explained?

How is Ecosystem best explained?

How is Pathogen best explained?

How is Vaccine best explained?

How is Antibody best explained?

How is Vitamin C best explained?

How is Vitamin D best explained?

How is Liver best explained?

How is Kidney best explained?

How is Insulin best explained?

How is Neuron best explained?

How is Haemoglobin best explained?

How is Photosynthesis best explained?

How is Meiosis best explained?

How is Mitosis best explained?

How is Gene best explained?

How is DNA best explained?

How is Ribosome best explained?

How is Mitochondrion best explained?

How is Cell best explained?

Free MCQs with Answers and Explanations