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FPSC MCQs

Federal Public Service Commission — Complete MCQ Bank

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FPSC recruitment tests assess subject knowledge, general ability and job-related competence for federal government positions across Pakistan.

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111
Biology Medium

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

  • AActivity slows gradually then speeds up
  • BActivity remains constant
  • CEnzyme is denatured and loses activity
  • DEnzyme replicates to compensate
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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.
Submitted by: PaperMCQs
112
Biology Medium

What term describes the specific molecule an enzyme acts upon?

  • ASubstrate
  • BProduct
  • CCofactor
  • DCoenzyme
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Correct Answer: Option A — Substrate
Explanation: The substrate is the specific molecule upon which an enzyme acts binding at the active site to form an enzyme-substrate complex and being converted into products.
Submitted by: PaperMCQs
113
Biology Medium

What is the role of enzymes in biological reactions?

  • AAct as biological catalysts to speed up reactions
  • BStore genetic information
  • CProvide energy for reactions
  • DTransport oxygen in blood
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Correct Answer: Option A — Act as biological catalysts to speed up reactions
Explanation: Enzymes are biological catalysts that speed up chemical reactions in living organisms by lowering activation energy without being consumed or permanently altered in the process.
Submitted by: PaperMCQs
114
Biology Easy

Which type of disease is caused by a pathogen and can be transmitted from one person to another?

  • ADeficiency disease
  • BCommunicable disease
  • CGenetic disease
  • DDegenerative disease
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Correct Answer: Option B — Communicable disease
Explanation: Communicable diseases are caused by pathogens such as bacteria viruses fungi or parasites and can be transmitted directly or indirectly from one person to another.
Submitted by: PaperMCQs
115
Biology Easy

Which type of disease is caused by a deficiency of essential nutrients in the diet?

  • ACommunicable disease
  • BHereditary disease
  • CAutoimmune disease
  • DDeficiency disease
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Correct Answer: Option D — Deficiency disease
Explanation: Deficiency diseases result from the lack of essential nutrients in the diet such as vitamins and minerals causing conditions like scurvy rickets anaemia and goitre.
Submitted by: PaperMCQs
116
Biology Hard

What is the process by which organisms survive extreme heat and drought by entering a dormant state?

  • AAestivation
  • BHibernation
  • CMigration
  • DDormancy only
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Correct Answer: Option A — Aestivation
Explanation: Aestivation is a state of dormancy similar to hibernation but entered during hot and dry summer conditions by animals like lungfish snails and some amphibians to prevent dehydration.
Submitted by: PaperMCQs
117
Biology Medium

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

  • AAestivation
  • BMigration
  • CDormancy
  • DHibernation
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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
118
Biology Medium

How many kingdoms are in the traditional five-kingdom system of classification?

  • AThree
  • BFive
  • CFour
  • DSix
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Correct Answer: Option B — Five
Explanation: The traditional five-kingdom system classifies all life into Monera Protista Fungi Plantae and Animalia based on cell type nutrition mode and body organisation.
Submitted by: PaperMCQs
119
Biology Hard

What is the broadest level of biological classification?

  • ADomain
  • BOrder
  • CFamily
  • DKingdom
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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.
Submitted by: PaperMCQs
120
Biology Medium

Which scientist developed the modern system of classification for organisms?

  • ACarl Linnaeus
  • BCharles Darwin
  • CGregor Mendel
  • DLouis Pasteur
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Correct Answer: Option A — Carl Linnaeus
Explanation: Carl Linnaeus developed the modern system of biological classification and binomial nomenclature in the 18th century providing a universal system for naming and organising living organisms.
Submitted by: PaperMCQs
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