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Biology MCQs

210 Questions Subject Test
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Build a clear understanding of living organisms, cells, genetics, human systems and the environment through carefully selected practice questions.

Cell BiologyHuman PhysiologyGeneticsEcology
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81
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the term for the symbiotic relationship where both organisms benefit?

  • A Commensalism
  • B Parasitism
  • C Mutualism
  • D Amensalism
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Correct Answer: Option C — Mutualism
Explanation: Mutualism is a type of symbiotic relationship where both organisms involved benefit from their interaction such as the relationship between bees and flowers.
Submitted by: PaperMCQs
82
Medium fpsc Uploaded: 06 Aug 2026

Which part of the human ear is responsible for maintaining balance?

  • A Cochlea
  • B Eardrum
  • C Ear lobe
  • D Semicircular canals
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Correct Answer: Option D — Semicircular canals
Explanation: The semicircular canals, located in the inner ear, contain fluid and sensory hair cells that detect changes in head position and rotational movement, sending signals to the brain to help maintain body balance and coordination.
Submitted by: PaperMCQs
83
Easy ppsc Uploaded: 06 Aug 2026

Which process describes the movement of water across a semipermeable membrane?

  • A Diffusion
  • B Osmosis
  • C Active transport
  • D Filtration
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Correct Answer: Option B — Osmosis
Explanation: Osmosis is the passive movement of water molecules from a region of lower solute concentration to higher solute concentration across a semipermeable membrane. This process is vital for maintaining cell shape and fluid balance.
Submitted by: PaperMCQs
84
Medium css fpsc ppsc Uploaded: 14 Jul 2026

What is the term for an organism that carries a recessive allele but does not show the trait?

  • A Dominant
  • B Carrier
  • C Homozygous
  • D Heterozygous
Permalink
Correct Answer: Option B — Carrier
Explanation: A carrier is an organism that is heterozygous for a recessive allele meaning it carries one dominant and one recessive allele and does not express the recessive trait but can pass it to offspring.
Submitted by: PaperMCQs
85
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which blood group is known as the universal donor?

  • A AB positive
  • B A negative
  • C B negative
  • D O negative
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Correct Answer: Option D — O negative
Explanation: O negative blood is the universal donor type because it lacks A B and Rh antigens on red blood cells making it compatible for transfusion to recipients of any blood type.
Submitted by: PaperMCQs
86
Medium pms Uploaded: 06 Aug 2026

Which vitamin deficiency causes the disease scurvy?

  • A Vitamin A
  • B Vitamin B12
  • C Vitamin C
  • D Vitamin D
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Correct Answer: Option C — Vitamin C
Explanation: Scurvy results from a prolonged deficiency of Vitamin C, which is essential for collagen synthesis and wound healing. Symptoms include bleeding gums, joint pain, and fatigue, historically common among sailors on long voyages.
Submitted by: PaperMCQs
87
Medium fpsc ppsc nts Uploaded: 05 Aug 2026

Which disease is caused by Mycobacterium tuberculosis primarily affecting the lungs?

  • A Typhoid
  • B Cholera
  • C Malaria
  • D Tuberculosis
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Correct Answer: Option D — Tuberculosis
Explanation: Tuberculosis is a bacterial infection caused by Mycobacterium tuberculosis primarily affecting the lungs and spread through airborne droplets making it one of the world's deadliest infectious diseases.
Submitted by: PaperMCQs
88
Hard css fpsc Uploaded: 14 Jul 2026

What is the process by which the kidneys filter blood to form urine?

  • A Ultrafiltration
  • B Secretion
  • C Reabsorption
  • D Digestion
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Correct Answer: Option A — Ultrafiltration
Explanation: Ultrafiltration is the first process in urine formation where high pressure in the glomerulus forces water glucose salts and urea out of the blood into the Bowman's capsule.
Submitted by: PaperMCQs
89
Medium pms Uploaded: 06 Aug 2026

What is the term for the maximum population size an environment can sustainably support?

  • A Carrying capacity
  • B Population density
  • C Biomass
  • D Growth rate
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Correct Answer: Option A — Carrying capacity
Explanation: Carrying capacity refers to the maximum number of individuals of a species that an environment can support indefinitely given available resources such as food, water, and space, without causing long-term ecological degradation or collapse.
Submitted by: PaperMCQs
90
Medium css Uploaded: 06 Aug 2026

What is the term for a change in the DNA sequence of an organism?

  • A Replication
  • B Transcription
  • C Mutation
  • D Translation
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Correct Answer: Option C — Mutation
Explanation: A mutation is an alteration in the DNA sequence that can occur naturally or due to environmental factors like radiation. Mutations can be harmful, neutral, or beneficial, and they drive genetic diversity and evolution.
Submitted by: PaperMCQs
91
Easy ppsc nts Uploaded: 14 Jul 2026

What is the term for organisms that eat both plants and animals?

  • A Herbivores
  • B Omnivores
  • C Carnivores
  • D Detritivores
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Correct Answer: Option B — Omnivores
Explanation: Omnivores are organisms that consume both plant material and other animals obtaining energy and nutrients from a variety of food sources examples include humans bears and pigs.
Submitted by: PaperMCQs
92
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which part of the human brain controls balance and coordinates muscular movement?

  • A Cerebellum
  • B Cerebrum
  • C Medulla oblongata
  • D Thalamus
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Correct Answer: Option A — Cerebellum
Explanation: The cerebellum coordinates voluntary movements maintains balance and posture and fine-tunes motor activities by processing information from the sensory systems and other brain areas.
Submitted by: PaperMCQs
93
Medium nts Uploaded: 06 Aug 2026

What is the term for animals lacking a backbone?

  • A Vertebrates
  • B Mammals
  • C Amphibians
  • D Invertebrates
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Correct Answer: Option D — Invertebrates
Explanation: Invertebrates are animals without a vertebral column or backbone, comprising the vast majority of animal species on Earth. Examples include insects, mollusks, worms, and jellyfish, showing enormous diversity in form and habitat.
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94
Hard fpsc Uploaded: 06 Aug 2026

What is the study of heredity and variation in organisms called?

  • A Ecology
  • B Taxonomy
  • C Genetics
  • D Physiology
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Correct Answer: Option C — Genetics
Explanation: Genetics is the branch of biology studying how traits are passed from parents to offspring through genes. Gregor Mendel's pea plant experiments laid the foundation for understanding patterns of inheritance and genetic variation.
Submitted by: PaperMCQs
95
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the term for all the organisms of the same species living in the same area at the same time?

  • A Community
  • B Ecosystem
  • C Population
  • D Biome
Permalink
Correct Answer: Option C — Population
Explanation: A population is a group of individuals of the same species living in the same area at the same time who can interbreed and share genetic resources.
Submitted by: PaperMCQs
96
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the full form of DNA?

  • A Deoxyribose Nucleic Acid
  • B Di-nitrogen Acid
  • C Dinucleic Acid
  • D Deoxyribonucleic Acid
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Correct Answer: Option D — Deoxyribonucleic Acid
Explanation: DNA stands for Deoxyribonucleic Acid and is the molecule that carries the genetic instructions for the development functioning growth and reproduction of all known organisms.
Submitted by: PaperMCQs
97
Easy fpsc Uploaded: 06 Aug 2026

Which blood vessels carry oxygenated blood away from the heart?

  • A Veins
  • B Capillaries
  • C Arteries
  • D Venules
Permalink
Correct Answer: Option C — Arteries
Explanation: Arteries typically carry oxygen-rich blood away from the heart to tissues throughout the body, with the notable exception of the pulmonary artery. Their thick, muscular walls withstand the high pressure generated by heart contractions.
Submitted by: PaperMCQs
98
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What happens to enzyme activity when temperature rises significantly above its optimum?

  • A Activity slows gradually then speeds up
  • B Activity remains constant
  • C Enzyme is denatured and loses activity
  • D Enzyme replicates to compensate
Permalink
Correct Answer: Option C — Enzyme is denatured and loses activity
Explanation: When temperature rises significantly above the optimum the enzyme is denatured meaning the active site changes shape so the substrate can no longer bind and activity is permanently lost.
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99
Hard css fpsc ppsc Uploaded: 14 Jul 2026

Which type of white blood cell produces antibodies against specific pathogens?

  • A Neutrophils
  • B B lymphocytes
  • C Monocytes
  • D Eosinophils
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Correct Answer: Option B — B lymphocytes
Explanation: B lymphocytes or B cells are white blood cells that produce specific antibodies when activated by an antigen providing targeted humoral immunity against pathogens.
Submitted by: PaperMCQs
100
Hard fpsc Uploaded: 06 Aug 2026

What is the term for a trait that is masked by another trait in heterozygous organisms?

  • A Dominant
  • B Homozygous
  • C Recessive
  • D Codominant
Permalink
Correct Answer: Option C — Recessive
Explanation: A recessive trait is one that is masked by a dominant allele when both are present in a heterozygous organism. Recessive traits only appear physically when an individual inherits two copies of the recessive allele.
Submitted by: PaperMCQs
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