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Biology MCQs

124 Questions Subject Test
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Cell BiologyHuman PhysiologyGeneticsEcology
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81
Medium fpsc ppsc nts Uploaded: 05 Aug 2026

Which structure in flowering plants contains ovules that develop into seeds after fertilisation?

  • A Stamen
  • B Petal
  • C Ovary
  • D Anther
Permalink
Correct Answer: Option C — Ovary
Explanation: The ovary is the female reproductive structure in flowering plants containing ovules that after fertilisation develop into seeds while the ovary wall develops into the surrounding fruit.
Submitted by: PaperMCQs
82
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

How many chambers does the human heart have?

  • A Two
  • B Three
  • C Four
  • D Five
Permalink
Correct Answer: Option C — Four
Explanation: The human heart has four chambers two upper atria that receive blood and two lower ventricles that pump blood ensuring separation of oxygenated and deoxygenated blood.
Submitted by: PaperMCQs
83
Easy ppsc Uploaded: 06 Aug 2026

What is the term for organisms that break down dead organic matter?

  • A Producers
  • B Consumers
  • C Decomposers
  • D Predators
Permalink
Correct Answer: Option C — Decomposers
Explanation: Decomposers, including fungi and bacteria, break down dead plants and animals into simpler substances, recycling nutrients back into the ecosystem. Without decomposers, nutrients would remain locked in organic matter, disrupting ecological balance.
Submitted by: PaperMCQs
84
Medium css fpsc ppsc Uploaded: 14 Jul 2026

What is the two-part Latin naming system for organisms called?

  • A Phylogenetic classification
  • B Binomial nomenclature
  • C Cladistics
  • D Linnaean classification
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Correct Answer: Option B — Binomial nomenclature
Explanation: Binomial nomenclature is the formal system of naming organisms using two Latin words the genus name and the species name developed by Carl Linnaeus in the 18th century.
Submitted by: PaperMCQs
85
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical messenger secreted by endocrine glands into the bloodstream called?

  • A Hormone
  • B Enzyme
  • C Neurotransmitter
  • D Antibody
Permalink
Correct Answer: Option A — Hormone
Explanation: Hormones are chemical messengers secreted by endocrine glands directly into the bloodstream and transported to target organs where they regulate physiological processes.
Submitted by: PaperMCQs
86
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the term for a community of organisms interacting with their physical environment?

  • A Biome
  • B Population
  • C Ecosystem
  • D Community
Permalink
Correct Answer: Option C — Ecosystem
Explanation: An ecosystem is a biological community of interacting organisms together with the physical environment in which they live including both biotic living and abiotic non-living components.
Submitted by: PaperMCQs
87
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the process by which green plants make their own food using sunlight?

  • A Respiration
  • B Transpiration
  • C Photosynthesis
  • D Fermentation
Permalink
Correct Answer: Option C — Photosynthesis
Explanation: Photosynthesis is the process by which green plants use sunlight carbon dioxide and water to produce glucose and oxygen in chloroplasts through light-dependent and light-independent reactions.
Submitted by: PaperMCQs
88
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the term for proteins produced by B lymphocytes in response to specific antigens?

  • A Antigens
  • B Enzymes
  • C Hormones
  • D Antibodies
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Correct Answer: Option D — Antibodies
Explanation: Antibodies also called immunoglobulins are Y-shaped proteins produced by B lymphocytes that specifically bind to antigens neutralising pathogens and marking them for destruction.
Submitted by: PaperMCQs
89
Medium css fpsc ppsc Uploaded: 14 Jul 2026

What is the function of lysosomes in animal cells?

  • A Protein synthesis
  • B Digestion of waste materials and cellular debris
  • C Energy production
  • D DNA storage
Permalink
Correct Answer: Option B — Digestion of waste materials and cellular debris
Explanation: Lysosomes are membrane-bound organelles containing digestive enzymes that break down waste materials damaged organelles and foreign substances through a process called autophagy.
Submitted by: PaperMCQs
90
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which scientist proposed the theory of evolution by natural selection?

  • A Gregor Mendel
  • B Louis Pasteur
  • C Charles Darwin
  • D Aristotle
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Correct Answer: Option C — Charles Darwin
Explanation: Charles Darwin proposed the theory of evolution by natural selection in his 1859 book On the Origin of Species explaining how species change over generations through differential reproduction.
Submitted by: PaperMCQs
91
Medium css fpsc ppsc Uploaded: 05 Aug 2026

Which process by which bacteria take up free DNA from their environment was discovered by Griffith?

  • A Transformation
  • B Conjugation
  • C Transduction
  • D Translation
Permalink
Correct Answer: Option A — Transformation
Explanation: Transformation is the process by which bacteria take up and incorporate free DNA from their environment first demonstrated by Frederick Griffith in 1928 using Streptococcus pneumoniae.
Submitted by: PaperMCQs
92
Medium ppsc Uploaded: 06 Aug 2026

What gas do plants absorb from the atmosphere during photosynthesis?

  • A Oxygen
  • B Nitrogen
  • C Carbon dioxide
  • D Hydrogen
Permalink
Correct Answer: Option C — Carbon dioxide
Explanation: Plants absorb carbon dioxide through tiny pores called stomata on their leaves. Using sunlight energy, they combine it with water to produce glucose and release oxygen as a byproduct, forming the basis of the food chain.
Submitted by: PaperMCQs
93
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which type of tissue in plants transports dissolved food from leaves to other parts?

  • A Phloem
  • B Cambium
  • C Xylem
  • D Epidermis
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Correct Answer: Option A — Phloem
Explanation: Phloem is the vascular tissue in plants responsible for transporting dissolved sugars and other organic compounds produced during photosynthesis from leaves to all parts of the plant.
Submitted by: PaperMCQs
94
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
95
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the process by which organisms adapt to extreme cold by entering a state of dormancy?

  • A Aestivation
  • B Migration
  • C Dormancy
  • D Hibernation
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Correct Answer: Option D — Hibernation
Explanation: Hibernation is a state of dormancy entered by some animals during cold winter months to conserve energy by lowering metabolic rate body temperature and heart rate.
Submitted by: PaperMCQs
96
Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which branch of biology deals with the study of viruses?

  • A Bacteriology
  • B Mycology
  • C Parasitology
  • D Virology
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Correct Answer: Option D — Virology
Explanation: Virology is the branch of biology that studies viruses including their structure classification evolution mechanisms of infection and methods of control.
Submitted by: PaperMCQs
97
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
Permalink
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.
Submitted by: PaperMCQs
98
Medium css fpsc ppsc Uploaded: 14 Jul 2026

What is the term for the genetic makeup of an organism?

  • A Phenotype
  • B Karyotype
  • C Genotype
  • D Genome
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Correct Answer: Option C — Genotype
Explanation: Genotype refers to the complete set of genetic information or alleles present in an organism that determines its inherited traits and potential phenotypic characteristics.
Submitted by: PaperMCQs
99
Medium css fpsc ppsc Uploaded: 14 Jul 2026

What is the functional unit of the kidney responsible for filtration of blood?

  • A Glomerulus
  • B Loop of Henle
  • C Bowman's capsule
  • D Nephron
Permalink
Correct Answer: Option D — Nephron
Explanation: The nephron is the basic structural and functional unit of the kidney responsible for filtering blood regulating water and electrolyte balance and producing urine.
Submitted by: PaperMCQs
100
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which type of organisms break down dead organic matter into simpler inorganic substances?

  • A Producers
  • B Decomposers
  • C Consumers
  • D Omnivores
Permalink
Correct Answer: Option B — Decomposers
Explanation: Decomposers such as bacteria and fungi break down dead organic matter into simpler inorganic substances recycling nutrients back into the ecosystem for use by producers.
Submitted by: PaperMCQs
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