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Biology MCQs

33 Questions Subject Test
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Cell BiologyHuman PhysiologyGeneticsEcology
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Hard pms Uploaded: 06 Aug 2026

What is the term for the loss of water and electrolytes from the body?

  • A Osmosis
  • B Diffusion
  • C Homeostasis
  • D Dehydration
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Correct Answer: Option D — Dehydration
Explanation: Dehydration occurs when the body loses more fluids than it takes in, disrupting the balance of water and essential electrolytes. Severe dehydration can impair organ function and, if untreated, may become life-threatening.
Submitted by: PaperMCQs
22
Hard css Uploaded: 06 Aug 2026

Which part of a plant is primarily responsible for absorbing water from the soil?

  • A Stem
  • B Leaf
  • C Root
  • D Flower
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Correct Answer: Option C — Root
Explanation: Roots anchor plants in soil and absorb water and dissolved minerals through tiny root hairs that increase surface area. This absorbed water travels upward through xylem tissue to support photosynthesis and overall plant growth.
Submitted by: PaperMCQs
23
Hard css fpsc Uploaded: 14 Jul 2026

What is the term for the complete set of chromosomes in a cell of an organism?

  • A Genome
  • B Karyotype
  • C Phenotype
  • D Genotype
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Correct Answer: Option B — Karyotype
Explanation: A karyotype is the complete set of chromosomes in a cell of an organism arranged and displayed in homologous pairs and used to diagnose chromosomal disorders.
Submitted by: PaperMCQs
24
Hard fpsc Uploaded: 06 Aug 2026

Which vitamin is essential for proper blood clotting in the human body?

  • A Vitamin A
  • B Vitamin K
  • C Vitamin B
  • D Vitamin E
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Correct Answer: Option B — Vitamin K
Explanation: Vitamin K plays a critical role in synthesizing proteins required for blood clotting. A deficiency can lead to excessive bleeding and impaired wound healing, making adequate intake essential for maintaining healthy hemostasis.
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25
Hard ppsc Uploaded: 06 Aug 2026

Which type of immunity is provided by vaccination?

  • A Artificial active
  • B Natural active
  • C Natural passive
  • D Artificial passive
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Correct Answer: Option A — Artificial active
Explanation: Vaccination introduces a weakened or inactive form of a pathogen into the body, stimulating the immune system to produce antibodies without causing full-blown disease. This creates artificial active immunity, offering long-term protection against infections.
Submitted by: PaperMCQs
26
Hard ppsc Uploaded: 06 Aug 2026

What is the term for genetically identical offspring produced through asexual reproduction?

  • A Hybrids
  • B Mutants
  • C Clones
  • D Variants
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Correct Answer: Option C — Clones
Explanation: Clones are genetically identical organisms produced through asexual reproduction methods such as budding, fragmentation, or vegetative propagation. Since no genetic mixing occurs, offspring share identical DNA with their single parent organism.
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27
Hard css fpsc Uploaded: 14 Jul 2026

What is the process by which bacteria exchange genetic material through direct contact?

  • A Transformation
  • B Transduction
  • C Conjugation
  • D Replication
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Correct Answer: Option C — Conjugation
Explanation: Conjugation is the process by which bacteria transfer genetic material including plasmids through direct physical contact via a structure called a pilus contributing to antibiotic resistance spread.
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28
Hard css fpsc Uploaded: 05 Aug 2026

What is the role of helper T cells in coordinating the immune response?

  • A Producing antibodies directly
  • B Destroying infected cells
  • C Activating B cells and cytotoxic T cells
  • D Engulfing pathogens
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Correct Answer: Option C — Activating B cells and cytotoxic T cells
Explanation: Helper T cells also called CD4 T cells coordinate the immune response by releasing cytokines that activate B cells to produce antibodies and stimulate cytotoxic T cells to destroy infected cells.
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29
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Which plant hormone signals guard cells to close stomata during drought conditions?

  • A Abscisic acid
  • B Auxin
  • C Gibberellin
  • D Cytokinin
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Correct Answer: Option A — Abscisic acid
Explanation: Abscisic acid ABA is a plant stress hormone that signals guard cells surrounding stomata to close during drought conditions reducing water loss through transpiration.
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30
Hard css fpsc ppsc Uploaded: 14 Jul 2026

What is the broadest level of biological classification?

  • A Domain
  • B Order
  • C Family
  • D Kingdom
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Correct Answer: Option A — Domain
Explanation: Domain is the broadest level in the modern biological classification system above kingdom and includes three domains Bacteria Archaea and Eukarya.
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31
Hard css fpsc Uploaded: 05 Aug 2026

Which organelle within the nucleus is responsible for producing ribosomal RNA?

  • A Centrosome
  • B Nucleolus
  • C Centriole
  • D Golgi body
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Correct Answer: Option B — Nucleolus
Explanation: The nucleolus is a dense region within the nucleus responsible for producing ribosomal RNA and assembling ribosome subunits that are then exported to the cytoplasm for protein synthesis.
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32
Hard css Uploaded: 06 Aug 2026

Which organ system includes the lungs and is responsible for gas exchange?

  • A Respiratory system
  • B Circulatory system
  • C Digestive system
  • D Nervous system
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Correct Answer: Option A — Respiratory system
Explanation: The respiratory system, including the lungs, trachea, and bronchi, facilitates the exchange of oxygen and carbon dioxide between the body and the atmosphere, supplying oxygen needed for cellular respiration and removing waste gas.
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33
Hard nts Uploaded: 06 Aug 2026

Which muscle type is found in the walls of internal organs and is involuntary?

  • A Smooth muscle
  • B Skeletal muscle
  • C Cardiac muscle
  • D Striated muscle
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Correct Answer: Option A — Smooth muscle
Explanation: Smooth muscle lines the walls of internal organs such as the stomach, intestines, and blood vessels. Unlike skeletal muscle, it contracts involuntarily and rhythmically, controlling processes like digestion and blood vessel diameter regulation.
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