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PPSC MCQs

Punjab Public Service Commission — Complete MCQ Bank

1,262 Questions
Exam Preparation Guide

How to prepare for PPSC

PPSC examinations recruit candidates for Punjab government departments and commonly test general knowledge, current affairs, English and post-related subjects.

Punjab AffairsGeneral KnowledgeCurrent AffairsEnglish
Give special attention to Punjab geography, history and administration alongside the advertised post’s specialist syllabus.
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All Subjects Biology Chemistry Computer Science Current Affairs English Everyday Science General Knowledge Islamic Studies Mathematics Pakistan Studies Physics
191
Biology Medium

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

  • AAntigens
  • BEnzymes
  • CHormones
  • DAntibodies
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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
192
Biology Medium

What is the term for a substance that triggers an immune response in the body?

  • AAntibody
  • BEnzyme
  • CAntigen
  • DHormone
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Correct Answer: Option C — Antigen
Explanation: An antigen is any substance usually a protein on the surface of a pathogen that is recognised as foreign by the immune system and triggers the production of specific antibodies.
Submitted by: PaperMCQs
193
Biology Hard

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

  • ANeutrophils
  • BB lymphocytes
  • CMonocytes
  • DEosinophils
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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
194
Biology Medium

What is the process by which white blood cells engulf and digest bacteria and foreign particles?

  • APhagocytosis
  • BEndocytosis
  • COsmosis
  • DPinocytosis
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Correct Answer: Option A — Phagocytosis
Explanation: Phagocytosis is the process by which phagocytes such as neutrophils and macrophages engulf and digest bacteria foreign particles and dead cells protecting the body from infection.
Submitted by: PaperMCQs
195
Biology Medium

Which type of immunity is present from birth and provides a non-specific first line of defence?

  • AAcquired immunity
  • BActive immunity
  • CPassive immunity
  • DInnate immunity
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Correct Answer: Option D — Innate immunity
Explanation: Innate immunity is the non-specific immune response present from birth providing the first line of defence through physical barriers inflammation and phagocytes against all pathogens.
Submitted by: PaperMCQs
196
Biology Medium

What is the term for the symbiotic relationship where one organism benefits and the other is neither helped nor harmed?

  • AMutualism
  • BParasitism
  • CAmensalism
  • DCommensalism
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Correct Answer: Option D — Commensalism
Explanation: Commensalism is a symbiotic relationship where one organism benefits while the other is neither harmed nor helped such as barnacles attaching to whales for transport.
Submitted by: PaperMCQs
197
Biology Medium

What is the term for the symbiotic relationship where one organism benefits and the other is harmed?

  • AMutualism
  • BCommensalism
  • CAmensalism
  • DParasitism
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Correct Answer: Option D — Parasitism
Explanation: Parasitism is a symbiotic relationship where one organism the parasite benefits at the expense of the other the host causing it harm such as tapeworms in the intestines.
Submitted by: PaperMCQs
198
Biology Medium

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

  • ACommensalism
  • BParasitism
  • CMutualism
  • DAmensalism
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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
199
Biology Medium

Which branch of biology deals with the study of viruses?

  • ABacteriology
  • BMycology
  • CParasitology
  • DVirology
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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
200
Biology Easy

Which disease results from the inability to produce or use insulin effectively?

  • ADiabetes mellitus
  • BHypertension
  • CAnaemia
  • DAsthma
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Correct Answer: Option A — Diabetes mellitus
Explanation: Diabetes mellitus results from insufficient insulin production or ineffective insulin utilisation leading to persistently high blood glucose levels that can damage organs over time.
Submitted by: PaperMCQs
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